Marinković, Dalibor

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Author's Bibliography

Evaluation of possible improvements of forced periodically operated reactor in which methanol synthesis takes place – based on the Nonlinear Frequency Response analysis

Marinković, Dalibor; Nikolić, Daliborka; Seidel, Carsten; Seidel-Morgenstern, Andreas; Kienle, Achim; Petkovska, Menka

(Stockholm, Sweden : Scanditale AB, 2024)

TY  - CONF
AU  - Marinković, Dalibor
AU  - Nikolić, Daliborka
AU  - Seidel, Carsten
AU  - Seidel-Morgenstern, Andreas
AU  - Kienle, Achim
AU  - Petkovska, Menka
PY  - 2024
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7522
AB  - The continuous industrial chemical processes are typically designed through steady-state conditions. Nevertheless, there is evidence that processes can be intensified by applying optimized forced periodic operation. Possible improvements in reactor performances caused by the implementation of forced periodic operation (FPO) can be successfully evaluated by applying a nonlinear frequency response (NFR) analysis, before experimental investigation. In this study, we will present the results of two case studies based on heterogeneously catalyzed methanol synthesis in a continuous stirred tank reactor (CSTR). The first is an isothermal case, and the second is a more complicated and more realistic, non-isothermal case.
PB  - Stockholm, Sweden : Scanditale AB
C3  - Energy Proceedings
T1  - Evaluation of possible improvements of forced periodically operated reactor in which methanol synthesis takes place – based on the Nonlinear Frequency Response analysis
VL  - 43
IS  - VI
DO  - 10.46855/energy-proceedings-11025
ER  - 
@conference{
author = "Marinković, Dalibor and Nikolić, Daliborka and Seidel, Carsten and Seidel-Morgenstern, Andreas and Kienle, Achim and Petkovska, Menka",
year = "2024",
abstract = "The continuous industrial chemical processes are typically designed through steady-state conditions. Nevertheless, there is evidence that processes can be intensified by applying optimized forced periodic operation. Possible improvements in reactor performances caused by the implementation of forced periodic operation (FPO) can be successfully evaluated by applying a nonlinear frequency response (NFR) analysis, before experimental investigation. In this study, we will present the results of two case studies based on heterogeneously catalyzed methanol synthesis in a continuous stirred tank reactor (CSTR). The first is an isothermal case, and the second is a more complicated and more realistic, non-isothermal case.",
publisher = "Stockholm, Sweden : Scanditale AB",
journal = "Energy Proceedings",
title = "Evaluation of possible improvements of forced periodically operated reactor in which methanol synthesis takes place – based on the Nonlinear Frequency Response analysis",
volume = "43",
number = "VI",
doi = "10.46855/energy-proceedings-11025"
}
Marinković, D., Nikolić, D., Seidel, C., Seidel-Morgenstern, A., Kienle, A.,& Petkovska, M.. (2024). Evaluation of possible improvements of forced periodically operated reactor in which methanol synthesis takes place – based on the Nonlinear Frequency Response analysis. in Energy Proceedings
Stockholm, Sweden : Scanditale AB., 43(VI).
https://doi.org/10.46855/energy-proceedings-11025
Marinković D, Nikolić D, Seidel C, Seidel-Morgenstern A, Kienle A, Petkovska M. Evaluation of possible improvements of forced periodically operated reactor in which methanol synthesis takes place – based on the Nonlinear Frequency Response analysis. in Energy Proceedings. 2024;43(VI).
doi:10.46855/energy-proceedings-11025 .
Marinković, Dalibor, Nikolić, Daliborka, Seidel, Carsten, Seidel-Morgenstern, Andreas, Kienle, Achim, Petkovska, Menka, "Evaluation of possible improvements of forced periodically operated reactor in which methanol synthesis takes place – based on the Nonlinear Frequency Response analysis" in Energy Proceedings, 43, no. VI (2024),
https://doi.org/10.46855/energy-proceedings-11025 . .

Recent advances in waste-based and natural zeolitic catalytic materials for biodiesel production

Marinković, Dalibor; Pavlović, Stefan

(Association of Chemical Engineers of Serbia, 2023)

TY  - JOUR
AU  - Marinković, Dalibor
AU  - Pavlović, Stefan
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6239
AB  - Considering the current world crisis and definite future energy challenges, biomass-to-fuel 
transformation is increasingly becoming important both to the policy makers and to the 
industry. In this perspective, the valorisation of oils and fats via transesterification/esteri fication reaction is an attractive method for producing biodiesel with qualities suitable for 
diesel engines. The recent interest indicated a significant shift to industrial waste valorisation 
as another approach for achieving process eco-efficiency. In this respect, the use of zeolite based catalysts for the production of biofuels is reviewed here, with a special emphasis on the 
utilization of waste raw materials following the principles of green chemistry and sustainable 
development. Zeolites are interesting due to their outstanding catalytic properties, including 
the presence of intrinsic acid sites, simple loading of base sites, shape-selectivity, and high 
thermal stability. Neat zeolites or modified by the loading of active species are classified into 
several groups following their origin. For each group, the most relevant recent results reported 
in the literature are reviewed together with some critical considerations on the catalyst 
effectiveness, stability, reusability, and economy of synthesis. As an important part required 
for understanding and optimization of the biodiesel production process, the mechanisms of 
the reaction were discussed in detail. Finally, key perspective directions for further research 
studies were carefully identified and elaborated.
AB  - Imajući u vidu trenutnu svetsku krizu kao i buduće energetske izazove, transformacija biomase u goriva ponovo dobija veliku pažnju zakonodavaca i industrije. Znajući ovo, valorizacija ulja i masnoća putem reakcija transesterifikacije/esterifikacije postaje atraktivan metod za proizvodnju kvalitetnog biodizela pogodnog za postojeće dizel motore. Veliko interesovanje naučnika ukazuje na značajan pomak ka valorizaciji industrijskog otpada kao još jednom pristupu za razvoj ekološki efikasnih procesa. U tom smislu, ovaj rad predstavlja pregled upotrebe zeolitnih katalizatora za dobijanje biogoriva, sa posebnim akcentom na upotrebu otpadnih sirovina u skladu sa principima zelene hemije i održivog razvoja. Zeolitni materijali su veoma pogodni zbog svojih izvanrednih katalitičkih svojstava, uključujući intrinsičke kisele centre, jednostavno nanošenje baznih centara, strukturnu selektivnost i veliku termičku stabilnost. Čisti zeoliti, ili modifikovani nanošenjem aktivnih centara, klasifikovani su u nekoliko grupa u ovom radu u skladu sa njihovim poreklom. Za svaku od različitih grupa zeolita, najrelevantniji skorašnji literaturni rezultati predstavljeni su zajedno sa kritičkim razmatranjem efikasnosti katalizatora, stabilnosti, mogućnosti ponovne upotrebe i ekonomičnosti njihove sinteze. Kao važan deo neophodan za razumevanje i optimizaciju procesa, detaljno su razmotreni mehanizmi reakcije. Na kraju, pažljivo su identifikovani i obrazloženi ključni perspektivni pravci za dalja istraživanja.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Recent advances in waste-based and natural zeolitic catalytic materials for biodiesel production
T1  - Najnovija saznanja o upotrebi prirodnih zeolita i zeolitnih katalizatora  baziranih na otpadu za proizvodnju biodizela
VL  - 77
IS  - 1
SP  - 5
EP  - 38
DO  - 10.2298/HEMIND220804007M
ER  - 
@article{
author = "Marinković, Dalibor and Pavlović, Stefan",
year = "2023",
abstract = "Considering the current world crisis and definite future energy challenges, biomass-to-fuel 
transformation is increasingly becoming important both to the policy makers and to the 
industry. In this perspective, the valorisation of oils and fats via transesterification/esteri fication reaction is an attractive method for producing biodiesel with qualities suitable for 
diesel engines. The recent interest indicated a significant shift to industrial waste valorisation 
as another approach for achieving process eco-efficiency. In this respect, the use of zeolite based catalysts for the production of biofuels is reviewed here, with a special emphasis on the 
utilization of waste raw materials following the principles of green chemistry and sustainable 
development. Zeolites are interesting due to their outstanding catalytic properties, including 
the presence of intrinsic acid sites, simple loading of base sites, shape-selectivity, and high 
thermal stability. Neat zeolites or modified by the loading of active species are classified into 
several groups following their origin. For each group, the most relevant recent results reported 
in the literature are reviewed together with some critical considerations on the catalyst 
effectiveness, stability, reusability, and economy of synthesis. As an important part required 
for understanding and optimization of the biodiesel production process, the mechanisms of 
the reaction were discussed in detail. Finally, key perspective directions for further research 
studies were carefully identified and elaborated., Imajući u vidu trenutnu svetsku krizu kao i buduće energetske izazove, transformacija biomase u goriva ponovo dobija veliku pažnju zakonodavaca i industrije. Znajući ovo, valorizacija ulja i masnoća putem reakcija transesterifikacije/esterifikacije postaje atraktivan metod za proizvodnju kvalitetnog biodizela pogodnog za postojeće dizel motore. Veliko interesovanje naučnika ukazuje na značajan pomak ka valorizaciji industrijskog otpada kao još jednom pristupu za razvoj ekološki efikasnih procesa. U tom smislu, ovaj rad predstavlja pregled upotrebe zeolitnih katalizatora za dobijanje biogoriva, sa posebnim akcentom na upotrebu otpadnih sirovina u skladu sa principima zelene hemije i održivog razvoja. Zeolitni materijali su veoma pogodni zbog svojih izvanrednih katalitičkih svojstava, uključujući intrinsičke kisele centre, jednostavno nanošenje baznih centara, strukturnu selektivnost i veliku termičku stabilnost. Čisti zeoliti, ili modifikovani nanošenjem aktivnih centara, klasifikovani su u nekoliko grupa u ovom radu u skladu sa njihovim poreklom. Za svaku od različitih grupa zeolita, najrelevantniji skorašnji literaturni rezultati predstavljeni su zajedno sa kritičkim razmatranjem efikasnosti katalizatora, stabilnosti, mogućnosti ponovne upotrebe i ekonomičnosti njihove sinteze. Kao važan deo neophodan za razumevanje i optimizaciju procesa, detaljno su razmotreni mehanizmi reakcije. Na kraju, pažljivo su identifikovani i obrazloženi ključni perspektivni pravci za dalja istraživanja.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Recent advances in waste-based and natural zeolitic catalytic materials for biodiesel production, Najnovija saznanja o upotrebi prirodnih zeolita i zeolitnih katalizatora  baziranih na otpadu za proizvodnju biodizela",
volume = "77",
number = "1",
pages = "5-38",
doi = "10.2298/HEMIND220804007M"
}
Marinković, D.,& Pavlović, S.. (2023). Recent advances in waste-based and natural zeolitic catalytic materials for biodiesel production. in Hemijska industrija
Association of Chemical Engineers of Serbia., 77(1), 5-38.
https://doi.org/10.2298/HEMIND220804007M
Marinković D, Pavlović S. Recent advances in waste-based and natural zeolitic catalytic materials for biodiesel production. in Hemijska industrija. 2023;77(1):5-38.
doi:10.2298/HEMIND220804007M .
Marinković, Dalibor, Pavlović, Stefan, "Recent advances in waste-based and natural zeolitic catalytic materials for biodiesel production" in Hemijska industrija, 77, no. 1 (2023):5-38,
https://doi.org/10.2298/HEMIND220804007M . .
1
1

Possible improvement of methanol synthesis exploiting forced periodic operation: Analysis using the Nonlinear Frequency Responce Method

Nikolić, Daliborka; Seidel, Carsten; Felischak, Matthias; Marinković, Dalibor; Kienle, Achim; Seidel-Morgenstern, Andreas; Petkovska, Menka

(The Wilhelm und Else Heraeus-Stiftung, Germany, 2022)

TY  - CONF
AU  - Nikolić, Daliborka
AU  - Seidel, Carsten
AU  - Felischak, Matthias
AU  - Marinković, Dalibor
AU  - Kienle, Achim
AU  - Seidel-Morgenstern, Andreas
AU  - Petkovska, Menka
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4926
AB  - Forced periodic operations, as one way of Process Intensification, can be used in order to achieve better performances of chemical reactors, in comparison to conventional steady-state operation. In this study the Nonlinear Frequency Response (NFR) method, a powerful analytical and approximate tool which gives an answer whether and under which conditions certain periodic operation would lead to improvement of process performance was used. The analysis was done for the methanol synthesis using a standard Cu/ZnO catalyst performed in an isothermal and isobaric lab-scale CSTR. At first the single input modulations were analysed. The inputs considered for periodic modulation are: partial pressures of each reactant in the feed stream and the total volumetric inlet flow-rate. The objective was to maximize the mean molar outlet flow-rate of methanol. The specific forcing parameters were optimized. The results of the NFR analysis showed that modulations of single inputs do not provide potential for significant improvements. 
The study was extended to analysis of periodic operations with simultaneous modulations of two inputs. Six possible input combinations were analysed and the optimal forcing parameters which maximizing again the time-average methanol production were determined. For all combinations an improvement is possible, but for some cases it was found to be not significant. However, significant 
improvements are predicted for a) simultaneous modulation of the partial pressure of CO2 in the feed steam and the volumetric inlet flow-rate and b) simultaneous modulation of the partial pressure of hydrogen (H2) and the volumetric inlet flow-rate [1, 2]. The highest improvement could be achieved for 
simultaneous modulation of the inlet partial pressure of CO and the inlet volumetric flow rate.
PB  - The Wilhelm und Else Heraeus-Stiftung, Germany
C3  - Booklet with abstracts - 758. WE-Heraeus-Seminar, From Wind and Solar Energy to Chemical Energy Storage: Understanding and Engineering Catalysis under Dynamic Conditions
T1  - Possible improvement of methanol synthesis exploiting forced periodic operation: Analysis using the Nonlinear Frequency Responce Method
SP  - 75
UR  - https://hdl.handle.net/21.15107/rcub_cer_4926
ER  - 
@conference{
author = "Nikolić, Daliborka and Seidel, Carsten and Felischak, Matthias and Marinković, Dalibor and Kienle, Achim and Seidel-Morgenstern, Andreas and Petkovska, Menka",
year = "2022",
abstract = "Forced periodic operations, as one way of Process Intensification, can be used in order to achieve better performances of chemical reactors, in comparison to conventional steady-state operation. In this study the Nonlinear Frequency Response (NFR) method, a powerful analytical and approximate tool which gives an answer whether and under which conditions certain periodic operation would lead to improvement of process performance was used. The analysis was done for the methanol synthesis using a standard Cu/ZnO catalyst performed in an isothermal and isobaric lab-scale CSTR. At first the single input modulations were analysed. The inputs considered for periodic modulation are: partial pressures of each reactant in the feed stream and the total volumetric inlet flow-rate. The objective was to maximize the mean molar outlet flow-rate of methanol. The specific forcing parameters were optimized. The results of the NFR analysis showed that modulations of single inputs do not provide potential for significant improvements. 
The study was extended to analysis of periodic operations with simultaneous modulations of two inputs. Six possible input combinations were analysed and the optimal forcing parameters which maximizing again the time-average methanol production were determined. For all combinations an improvement is possible, but for some cases it was found to be not significant. However, significant 
improvements are predicted for a) simultaneous modulation of the partial pressure of CO2 in the feed steam and the volumetric inlet flow-rate and b) simultaneous modulation of the partial pressure of hydrogen (H2) and the volumetric inlet flow-rate [1, 2]. The highest improvement could be achieved for 
simultaneous modulation of the inlet partial pressure of CO and the inlet volumetric flow rate.",
publisher = "The Wilhelm und Else Heraeus-Stiftung, Germany",
journal = "Booklet with abstracts - 758. WE-Heraeus-Seminar, From Wind and Solar Energy to Chemical Energy Storage: Understanding and Engineering Catalysis under Dynamic Conditions",
title = "Possible improvement of methanol synthesis exploiting forced periodic operation: Analysis using the Nonlinear Frequency Responce Method",
pages = "75",
url = "https://hdl.handle.net/21.15107/rcub_cer_4926"
}
Nikolić, D., Seidel, C., Felischak, M., Marinković, D., Kienle, A., Seidel-Morgenstern, A.,& Petkovska, M.. (2022). Possible improvement of methanol synthesis exploiting forced periodic operation: Analysis using the Nonlinear Frequency Responce Method. in Booklet with abstracts - 758. WE-Heraeus-Seminar, From Wind and Solar Energy to Chemical Energy Storage: Understanding and Engineering Catalysis under Dynamic Conditions
The Wilhelm und Else Heraeus-Stiftung, Germany., 75.
https://hdl.handle.net/21.15107/rcub_cer_4926
Nikolić D, Seidel C, Felischak M, Marinković D, Kienle A, Seidel-Morgenstern A, Petkovska M. Possible improvement of methanol synthesis exploiting forced periodic operation: Analysis using the Nonlinear Frequency Responce Method. in Booklet with abstracts - 758. WE-Heraeus-Seminar, From Wind and Solar Energy to Chemical Energy Storage: Understanding and Engineering Catalysis under Dynamic Conditions. 2022;:75.
https://hdl.handle.net/21.15107/rcub_cer_4926 .
Nikolić, Daliborka, Seidel, Carsten, Felischak, Matthias, Marinković, Dalibor, Kienle, Achim, Seidel-Morgenstern, Andreas, Petkovska, Menka, "Possible improvement of methanol synthesis exploiting forced periodic operation: Analysis using the Nonlinear Frequency Responce Method" in Booklet with abstracts - 758. WE-Heraeus-Seminar, From Wind and Solar Energy to Chemical Energy Storage: Understanding and Engineering Catalysis under Dynamic Conditions (2022):75,
https://hdl.handle.net/21.15107/rcub_cer_4926 .

Evaluating the shape of input pertubation for forced periodic operation

Kaps, Lothar; Seidel, Carsten; Marinković, Dalibor; Kienle, Achim; Seidel-Morgenstern, Andreas; Nikolić, Daliborka; Petkovska, Menka

(DECHEMA Gesellschaft für Chemische Technik und Biotechnologie e.V. (Society for Chemical Engineering and Biotechnology), 2022)

TY  - CONF
AU  - Kaps, Lothar
AU  - Seidel, Carsten
AU  - Marinković, Dalibor
AU  - Kienle, Achim
AU  - Seidel-Morgenstern, Andreas
AU  - Nikolić, Daliborka
AU  - Petkovska, Menka
PY  - 2022
UR  - https://dechema.de/react_hmt_2022.html
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6314
AB  - Continuous chemical processes are typically designed to operate under steady state 
conditions. However, there is strong evidence that an optimized forced periodic 
operation possesses the potential to improve process performance [1]. More
demonstration examples are needed to promote such advanced concepts.
In this contribution we will present results for two case studies. The first reaction 
investigated is the liquid phase hydrolysis of acetic anhydride performed in an adiabatic 
continuous stirred tank reactor (CSTR). The second examples is the heterogeneously 
catalysed gas phase synthesis of methanol performed in an isothermal and isobaric 
CSTR. Our theoretical analysis exploits independently determined kinetic models of 
these reactions [2, 3]. Besides performing numerical process simulations the Nonlinear 
Frequency Response (NFR) method [4] is used. The magnitude of possible process 
improvements depends on the applied strategy of forced periodic operation. Besides 
the input to be perturbed (concentration, flowrate, temperature, …), the forcing 
frequency and the forcing amplitude as well as the shape of the input modulation are
of relevance. In this contribution we will compare the input modulated as harmonic
(Fig 1a) and as a square wave function (“bang-bang”, Fig 1b). In order to use the NFR 
method for the latter input function an approximation via Fourier series is applied [5, 6].
The results reveal improvements of easier to practically implement square wave inputs
for both examples considered, compared to harmonic modulation of inputs [5, 6].
PB  - DECHEMA Gesellschaft für Chemische Technik und Biotechnologie e.V. (Society for Chemical Engineering and Biotechnology)
C3  - Book of abstracts - Annual Meeting on Reaction Engineering and ProcessNet Subject Division Heat and Mass Transfer 2022, 18 – 20 July 2022  Congress Center Würzburg, Germany
T1  - Evaluating the shape of input pertubation for forced periodic operation
SP  - 177
EP  - 178
UR  - https://hdl.handle.net/21.15107/rcub_cer_6314
ER  - 
@conference{
author = "Kaps, Lothar and Seidel, Carsten and Marinković, Dalibor and Kienle, Achim and Seidel-Morgenstern, Andreas and Nikolić, Daliborka and Petkovska, Menka",
year = "2022",
abstract = "Continuous chemical processes are typically designed to operate under steady state 
conditions. However, there is strong evidence that an optimized forced periodic 
operation possesses the potential to improve process performance [1]. More
demonstration examples are needed to promote such advanced concepts.
In this contribution we will present results for two case studies. The first reaction 
investigated is the liquid phase hydrolysis of acetic anhydride performed in an adiabatic 
continuous stirred tank reactor (CSTR). The second examples is the heterogeneously 
catalysed gas phase synthesis of methanol performed in an isothermal and isobaric 
CSTR. Our theoretical analysis exploits independently determined kinetic models of 
these reactions [2, 3]. Besides performing numerical process simulations the Nonlinear 
Frequency Response (NFR) method [4] is used. The magnitude of possible process 
improvements depends on the applied strategy of forced periodic operation. Besides 
the input to be perturbed (concentration, flowrate, temperature, …), the forcing 
frequency and the forcing amplitude as well as the shape of the input modulation are
of relevance. In this contribution we will compare the input modulated as harmonic
(Fig 1a) and as a square wave function (“bang-bang”, Fig 1b). In order to use the NFR 
method for the latter input function an approximation via Fourier series is applied [5, 6].
The results reveal improvements of easier to practically implement square wave inputs
for both examples considered, compared to harmonic modulation of inputs [5, 6].",
publisher = "DECHEMA Gesellschaft für Chemische Technik und Biotechnologie e.V. (Society for Chemical Engineering and Biotechnology)",
journal = "Book of abstracts - Annual Meeting on Reaction Engineering and ProcessNet Subject Division Heat and Mass Transfer 2022, 18 – 20 July 2022  Congress Center Würzburg, Germany",
title = "Evaluating the shape of input pertubation for forced periodic operation",
pages = "177-178",
url = "https://hdl.handle.net/21.15107/rcub_cer_6314"
}
Kaps, L., Seidel, C., Marinković, D., Kienle, A., Seidel-Morgenstern, A., Nikolić, D.,& Petkovska, M.. (2022). Evaluating the shape of input pertubation for forced periodic operation. in Book of abstracts - Annual Meeting on Reaction Engineering and ProcessNet Subject Division Heat and Mass Transfer 2022, 18 – 20 July 2022  Congress Center Würzburg, Germany
DECHEMA Gesellschaft für Chemische Technik und Biotechnologie e.V. (Society for Chemical Engineering and Biotechnology)., 177-178.
https://hdl.handle.net/21.15107/rcub_cer_6314
Kaps L, Seidel C, Marinković D, Kienle A, Seidel-Morgenstern A, Nikolić D, Petkovska M. Evaluating the shape of input pertubation for forced periodic operation. in Book of abstracts - Annual Meeting on Reaction Engineering and ProcessNet Subject Division Heat and Mass Transfer 2022, 18 – 20 July 2022  Congress Center Würzburg, Germany. 2022;:177-178.
https://hdl.handle.net/21.15107/rcub_cer_6314 .
Kaps, Lothar, Seidel, Carsten, Marinković, Dalibor, Kienle, Achim, Seidel-Morgenstern, Andreas, Nikolić, Daliborka, Petkovska, Menka, "Evaluating the shape of input pertubation for forced periodic operation" in Book of abstracts - Annual Meeting on Reaction Engineering and ProcessNet Subject Division Heat and Mass Transfer 2022, 18 – 20 July 2022  Congress Center Würzburg, Germany (2022):177-178,
https://hdl.handle.net/21.15107/rcub_cer_6314 .

Acceleration of biodiesel production from off-grade oil over waste-based CaO catalyst

Pavlović, Stefan; Kosić, Višnja; Lončarević, Davor; Kostić, Milan; Marinković, Dalibor

(Aachen, Germany : Fuel Science Center, RWTH Aachen University, 2022)

TY  - CONF
AU  - Pavlović, Stefan
AU  - Kosić, Višnja
AU  - Lončarević, Davor
AU  - Kostić, Milan
AU  - Marinković, Dalibor
PY  - 2022
UR  - https://www.fuelcenter.rwth-aachen.de/cms/Fuelcenter/Austausch/Internationale-Konferenz/~rwsva/10-Internationale-Konferenz-2022/?lidx=1
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5304
AB  - Waste-based CaO was synthesized from chicken eggshell, which calcined form (900 ºC, 5 ºC/min, 4 h) was hydrated (80 ºC, S:L=1:5, 24 h) and rehydrated/calcined (600 ºC, 5 ºC/min, 4 h). The obtained catalyst was characterized (Hg-porosimetry and TPD-CO2) and tested in biodiesel synthesis from off-grade sunflower oil by transesterification to analyse the influence of water addition on reaction intensification. Water content was varied in the range from 1 wt% to 9 wt% by weight of oil. It is shown that water addition positively affects the catalytic activity leading to a reduction in induction time and to faster achievement of the reaction equilibrium (fatty acid methyl esters content > 95%), which for a water content higher than 1 wt% is achieved in 90 min. On the other hand, the equilibrium for the reaction without water addition was achieved considerably later (after 150 min).
PB  - Aachen, Germany : Fuel Science Center, RWTH Aachen University
C3  - Conference report/Book of abstracts-10th International Conference "Fuel Science - From Production to Propulsion"
T1  - Acceleration of biodiesel production from off-grade oil over waste-based CaO catalyst
SP  - 83
EP  - 84
UR  - https://hdl.handle.net/21.15107/rcub_cer_5304
ER  - 
@conference{
author = "Pavlović, Stefan and Kosić, Višnja and Lončarević, Davor and Kostić, Milan and Marinković, Dalibor",
year = "2022",
abstract = "Waste-based CaO was synthesized from chicken eggshell, which calcined form (900 ºC, 5 ºC/min, 4 h) was hydrated (80 ºC, S:L=1:5, 24 h) and rehydrated/calcined (600 ºC, 5 ºC/min, 4 h). The obtained catalyst was characterized (Hg-porosimetry and TPD-CO2) and tested in biodiesel synthesis from off-grade sunflower oil by transesterification to analyse the influence of water addition on reaction intensification. Water content was varied in the range from 1 wt% to 9 wt% by weight of oil. It is shown that water addition positively affects the catalytic activity leading to a reduction in induction time and to faster achievement of the reaction equilibrium (fatty acid methyl esters content > 95%), which for a water content higher than 1 wt% is achieved in 90 min. On the other hand, the equilibrium for the reaction without water addition was achieved considerably later (after 150 min).",
publisher = "Aachen, Germany : Fuel Science Center, RWTH Aachen University",
journal = "Conference report/Book of abstracts-10th International Conference "Fuel Science - From Production to Propulsion"",
title = "Acceleration of biodiesel production from off-grade oil over waste-based CaO catalyst",
pages = "83-84",
url = "https://hdl.handle.net/21.15107/rcub_cer_5304"
}
Pavlović, S., Kosić, V., Lončarević, D., Kostić, M.,& Marinković, D.. (2022). Acceleration of biodiesel production from off-grade oil over waste-based CaO catalyst. in Conference report/Book of abstracts-10th International Conference "Fuel Science - From Production to Propulsion"
Aachen, Germany : Fuel Science Center, RWTH Aachen University., 83-84.
https://hdl.handle.net/21.15107/rcub_cer_5304
Pavlović S, Kosić V, Lončarević D, Kostić M, Marinković D. Acceleration of biodiesel production from off-grade oil over waste-based CaO catalyst. in Conference report/Book of abstracts-10th International Conference "Fuel Science - From Production to Propulsion". 2022;:83-84.
https://hdl.handle.net/21.15107/rcub_cer_5304 .
Pavlović, Stefan, Kosić, Višnja, Lončarević, Davor, Kostić, Milan, Marinković, Dalibor, "Acceleration of biodiesel production from off-grade oil over waste-based CaO catalyst" in Conference report/Book of abstracts-10th International Conference "Fuel Science - From Production to Propulsion" (2022):83-84,
https://hdl.handle.net/21.15107/rcub_cer_5304 .

Neat and loaded CaO-based catalysts from natural or waste sources for the triacylglycerols methanolysisis reaction

Marinković, Dalibor

(Serbian Ceramic Society, 2022)

TY  - CONF
AU  - Marinković, Dalibor
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6238
AB  - In recent decades, especially in recent years, more and more attention is focused on energy 
consumption, energy efficiency, fossil fuels emission and depletion, and alternative energy 
sources and uses. Biofuels, such as biodiesel, are significant competitors to fossil diesel fuel, 
in particular when a modern approach to biodiesel production is involved. Waste or non edible feedstock, waste-based catalysts and reactor intensification are the key for this 
innovative strategy. CaO as a cheap, easily available from waste and natural sources, possess 
good catalytic activity, so is imposed as a desirable catalyst in the transesterification reaction.
This work systematically presents methods for the CaO-based catalysts synthesis, their 
activity in the methanolysis reaction, their stability during manipulation, as well as the reason 
for their deactivation. Neat catalysts obtained from waste egg shell and catalysts where CaO 
was loaded on gamma-alumina and zeolitic carrier (obtained from waste fly ash formed by 
burning coal in a thermal power plants) were compared. Also, several different types of 
reactors were used, batch stirred, packed bed tubular reactor and microreactor. Catalysts
performance in reaction with edible sunflower and waste cooking oil was considered.
PB  - Serbian  Ceramic Society
C3  - Program and the book of abstracts - Serbian Ceramic Society Conference – Advanced Ceramics and Application X, 26-27th September 2022, Belgrade, Serbia
T1  - Neat and loaded CaO-based catalysts from natural or waste sources for the triacylglycerols methanolysisis reaction
SP  - 54
EP  - 54
UR  - https://hdl.handle.net/21.15107/rcub_cer_6238
ER  - 
@conference{
author = "Marinković, Dalibor",
year = "2022",
abstract = "In recent decades, especially in recent years, more and more attention is focused on energy 
consumption, energy efficiency, fossil fuels emission and depletion, and alternative energy 
sources and uses. Biofuels, such as biodiesel, are significant competitors to fossil diesel fuel, 
in particular when a modern approach to biodiesel production is involved. Waste or non edible feedstock, waste-based catalysts and reactor intensification are the key for this 
innovative strategy. CaO as a cheap, easily available from waste and natural sources, possess 
good catalytic activity, so is imposed as a desirable catalyst in the transesterification reaction.
This work systematically presents methods for the CaO-based catalysts synthesis, their 
activity in the methanolysis reaction, their stability during manipulation, as well as the reason 
for their deactivation. Neat catalysts obtained from waste egg shell and catalysts where CaO 
was loaded on gamma-alumina and zeolitic carrier (obtained from waste fly ash formed by 
burning coal in a thermal power plants) were compared. Also, several different types of 
reactors were used, batch stirred, packed bed tubular reactor and microreactor. Catalysts
performance in reaction with edible sunflower and waste cooking oil was considered.",
publisher = "Serbian  Ceramic Society",
journal = "Program and the book of abstracts - Serbian Ceramic Society Conference – Advanced Ceramics and Application X, 26-27th September 2022, Belgrade, Serbia",
title = "Neat and loaded CaO-based catalysts from natural or waste sources for the triacylglycerols methanolysisis reaction",
pages = "54-54",
url = "https://hdl.handle.net/21.15107/rcub_cer_6238"
}
Marinković, D.. (2022). Neat and loaded CaO-based catalysts from natural or waste sources for the triacylglycerols methanolysisis reaction. in Program and the book of abstracts - Serbian Ceramic Society Conference – Advanced Ceramics and Application X, 26-27th September 2022, Belgrade, Serbia
Serbian  Ceramic Society., 54-54.
https://hdl.handle.net/21.15107/rcub_cer_6238
Marinković D. Neat and loaded CaO-based catalysts from natural or waste sources for the triacylglycerols methanolysisis reaction. in Program and the book of abstracts - Serbian Ceramic Society Conference – Advanced Ceramics and Application X, 26-27th September 2022, Belgrade, Serbia. 2022;:54-54.
https://hdl.handle.net/21.15107/rcub_cer_6238 .
Marinković, Dalibor, "Neat and loaded CaO-based catalysts from natural or waste sources for the triacylglycerols methanolysisis reaction" in Program and the book of abstracts - Serbian Ceramic Society Conference – Advanced Ceramics and Application X, 26-27th September 2022, Belgrade, Serbia (2022):54-54,
https://hdl.handle.net/21.15107/rcub_cer_6238 .

Biodiesel Production From Off-Grade Oil By Transesterification Over Differently Granulated Waste-Based CaO Catalysts

Pavlović, Stefan; Kosić, Višnja; Marinković, Dalibor; Kostić, Milan

(2022)

TY  - CONF
AU  - Pavlović, Stefan
AU  - Kosić, Višnja
AU  - Marinković, Dalibor
AU  - Kostić, Milan
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5307
AB  - The waste fractionated chicken eggshell catalysts were utilized and used in biodiesel production from off-grade sunflower oil. It is confirmed that thermal modification treatment was suitable for conversion of calcite form of eggshell into lime. Fractionation was carried out in the wide particle diameter range from 20 μm. to 100 μm. It is shown that the highest catalytic activity (fatty acid methyl esters content-FAME >96%) was achieved using catalyst obtained from powder faction of >45<63 μm. Important differences in catalytic activity were observed for the boundary fractions (<20 μm, >20<36 μm, and >100 μm), where catalytic activity was greatly reduced. Such behaviour could be explained by mercury intrusion porosimetry results, which indicate the existence of apparent porosity (interparticle and intraparticle) in the mentioned boundary fractions, while in the central fraction (>45<63 μm) the porosity is constant. A poorly-developed system of pores and channels leads to difficult diffusion and inadequate distribution of active centres.
C3  - Proceedings - 2nd International Conference On Green Energy And Environmental Technology
T1  - Biodiesel Production From Off-Grade Oil By Transesterification Over Differently Granulated Waste-Based CaO Catalysts
UR  - https://hdl.handle.net/21.15107/rcub_cer_5307
ER  - 
@conference{
author = "Pavlović, Stefan and Kosić, Višnja and Marinković, Dalibor and Kostić, Milan",
year = "2022",
abstract = "The waste fractionated chicken eggshell catalysts were utilized and used in biodiesel production from off-grade sunflower oil. It is confirmed that thermal modification treatment was suitable for conversion of calcite form of eggshell into lime. Fractionation was carried out in the wide particle diameter range from 20 μm. to 100 μm. It is shown that the highest catalytic activity (fatty acid methyl esters content-FAME >96%) was achieved using catalyst obtained from powder faction of >45<63 μm. Important differences in catalytic activity were observed for the boundary fractions (<20 μm, >20<36 μm, and >100 μm), where catalytic activity was greatly reduced. Such behaviour could be explained by mercury intrusion porosimetry results, which indicate the existence of apparent porosity (interparticle and intraparticle) in the mentioned boundary fractions, while in the central fraction (>45<63 μm) the porosity is constant. A poorly-developed system of pores and channels leads to difficult diffusion and inadequate distribution of active centres.",
journal = "Proceedings - 2nd International Conference On Green Energy And Environmental Technology",
title = "Biodiesel Production From Off-Grade Oil By Transesterification Over Differently Granulated Waste-Based CaO Catalysts",
url = "https://hdl.handle.net/21.15107/rcub_cer_5307"
}
Pavlović, S., Kosić, V., Marinković, D.,& Kostić, M.. (2022). Biodiesel Production From Off-Grade Oil By Transesterification Over Differently Granulated Waste-Based CaO Catalysts. in Proceedings - 2nd International Conference On Green Energy And Environmental Technology.
https://hdl.handle.net/21.15107/rcub_cer_5307
Pavlović S, Kosić V, Marinković D, Kostić M. Biodiesel Production From Off-Grade Oil By Transesterification Over Differently Granulated Waste-Based CaO Catalysts. in Proceedings - 2nd International Conference On Green Energy And Environmental Technology. 2022;.
https://hdl.handle.net/21.15107/rcub_cer_5307 .
Pavlović, Stefan, Kosić, Višnja, Marinković, Dalibor, Kostić, Milan, "Biodiesel Production From Off-Grade Oil By Transesterification Over Differently Granulated Waste-Based CaO Catalysts" in Proceedings - 2nd International Conference On Green Energy And Environmental Technology (2022),
https://hdl.handle.net/21.15107/rcub_cer_5307 .

Stability of waste-based zeolite supported CaO catalyst for biodiesel production from waste oily feedstocks

Pavlović, Stefan; Marinković, Dalibor; Milovanović, Biljana; Tišma, Marina; Mojović, Ljiljana; Stanković, Miroslav

(Fuel Science Center, 2021)

TY  - CONF
AU  - Pavlović, Stefan
AU  - Marinković, Dalibor
AU  - Milovanović, Biljana
AU  - Tišma, Marina
AU  - Mojović, Ljiljana
AU  - Stanković, Miroslav
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4721
AB  - Waste-based zeolite supported CaO catalyst (20CaO/ZMFA) was synthesized by ultrasound-assisted impregnation from alcoholic suspension. Zeolite was previously synthesized from lignite coal fly ash (FA) by alkali activation in miniature rotating autoclave reactors (6.25 M NaOH, 260 °C, 4 h), whereas CaO was prepared by chicken eggshell (ES) calcination (900 ºC, 4 h). The final catalyst was obtained by precursor calcination at 550 °C, 4 h. The obtained catalyst was used for catalyst stability tests (reusability and leaching) in transesterification (methanol/oil molar ratio of 12/1, catalyst concentration of 4 wt%, and temperature of 60 °C) of three types of oily feedstocks, fresh sunflower oil (SFO), waste cooking oil (WCO) and model thermal treated (230 °C, 5 days) sunflower oil (SFOTT). The concentration of triacylglycerols (TAGs) and fatty acid methyl esters (FAMEs) was determined by GC and HPLC, respectively. The 20CaO/ZMFA exhibited high activity (FAME content > 96.5 % for 180 min) in the transesterification of all three oily feedstocks. The stability tests are shown that catalyst is stable even in four reaction cycles for SFO and WCO, whereas the Ca 2+ leaching was significantly lower compared to similar catalytic systems.
PB  - Fuel Science Center
C3  - 9th International Conference Fuel Science - From Production to Propulsion 2021
T1  - Stability of waste-based zeolite supported CaO catalyst for biodiesel production from waste oily feedstocks
UR  - https://hdl.handle.net/21.15107/rcub_cer_4721
ER  - 
@conference{
author = "Pavlović, Stefan and Marinković, Dalibor and Milovanović, Biljana and Tišma, Marina and Mojović, Ljiljana and Stanković, Miroslav",
year = "2021",
abstract = "Waste-based zeolite supported CaO catalyst (20CaO/ZMFA) was synthesized by ultrasound-assisted impregnation from alcoholic suspension. Zeolite was previously synthesized from lignite coal fly ash (FA) by alkali activation in miniature rotating autoclave reactors (6.25 M NaOH, 260 °C, 4 h), whereas CaO was prepared by chicken eggshell (ES) calcination (900 ºC, 4 h). The final catalyst was obtained by precursor calcination at 550 °C, 4 h. The obtained catalyst was used for catalyst stability tests (reusability and leaching) in transesterification (methanol/oil molar ratio of 12/1, catalyst concentration of 4 wt%, and temperature of 60 °C) of three types of oily feedstocks, fresh sunflower oil (SFO), waste cooking oil (WCO) and model thermal treated (230 °C, 5 days) sunflower oil (SFOTT). The concentration of triacylglycerols (TAGs) and fatty acid methyl esters (FAMEs) was determined by GC and HPLC, respectively. The 20CaO/ZMFA exhibited high activity (FAME content > 96.5 % for 180 min) in the transesterification of all three oily feedstocks. The stability tests are shown that catalyst is stable even in four reaction cycles for SFO and WCO, whereas the Ca 2+ leaching was significantly lower compared to similar catalytic systems.",
publisher = "Fuel Science Center",
journal = "9th International Conference Fuel Science - From Production to Propulsion 2021",
title = "Stability of waste-based zeolite supported CaO catalyst for biodiesel production from waste oily feedstocks",
url = "https://hdl.handle.net/21.15107/rcub_cer_4721"
}
Pavlović, S., Marinković, D., Milovanović, B., Tišma, M., Mojović, L.,& Stanković, M.. (2021). Stability of waste-based zeolite supported CaO catalyst for biodiesel production from waste oily feedstocks. in 9th International Conference Fuel Science - From Production to Propulsion 2021
Fuel Science Center..
https://hdl.handle.net/21.15107/rcub_cer_4721
Pavlović S, Marinković D, Milovanović B, Tišma M, Mojović L, Stanković M. Stability of waste-based zeolite supported CaO catalyst for biodiesel production from waste oily feedstocks. in 9th International Conference Fuel Science - From Production to Propulsion 2021. 2021;.
https://hdl.handle.net/21.15107/rcub_cer_4721 .
Pavlović, Stefan, Marinković, Dalibor, Milovanović, Biljana, Tišma, Marina, Mojović, Ljiljana, Stanković, Miroslav, "Stability of waste-based zeolite supported CaO catalyst for biodiesel production from waste oily feedstocks" in 9th International Conference Fuel Science - From Production to Propulsion 2021 (2021),
https://hdl.handle.net/21.15107/rcub_cer_4721 .

The chicken eggshell calcium oxide ultrasonically dispersed over lignite coal fly ash-based cancrinite zeolite support as a catalyst for biodiesel production

Pavlović, Stefan; Marinković, Dalibor; Kostić, Milan; Lončarević, Davor; Mojović, Ljiljana; Stanković, Miroslav; Veljković, Vlada B.

(Elsevier, 2021)

TY  - JOUR
AU  - Pavlović, Stefan
AU  - Marinković, Dalibor
AU  - Kostić, Milan
AU  - Lončarević, Davor
AU  - Mojović, Ljiljana
AU  - Stanković, Miroslav
AU  - Veljković, Vlada B.
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4035
AB  - Lignite coal fly ash (FA) from a domestic thermal power plant was converted into a pure cancrinite zeolitic material (ZMFA) using a novel, custom-made, rotating autoclave reactor system by a short-term alkali activation process. The obtained ZMFA was used as catalyst support of calcium oxide as an active component derived from waste chicken eggshells (ES). The ZMFA supported calcium oxide catalyst (xCaO/ZMFA) was synthesized by means of the ultrasound-assisted method. The influence of different concentrations of dispersed calcium oxide (x = 5–20 wt%) over ZMFA and thermal treatment at different temperatures (450–600 °C) were studied. The structural and morphological characterization showed that the original cancrinite structure was preserved. The basicity and textural properties indicated the presence of strong active sites in a well-defined pore network suitable for the reactions of bulky organic compounds such as triacylglycerols (TAGs). The highest activity (96.5% of fatty acid methyl esters) in the methanolysis of sunflower oil was achieved with the 20CaO/ZMFA catalyst under reaction conditions: temperature of 60 °C, methanol/oil molar ratio of 12:1, catalyst concentration of 4 wt%, and reaction time of 2 h. It was found that the optimal calcination temperature of the catalyst precursor was 550 °C. At calcination temperatures above 550 °C, the melting of the glassy phase became more intense whereby the molten phase partially reacted with calcium oxide forming the catalytically inactive calcium silicate compounds (wollastonite, larnite, etc.). The rate constants of the two tested kinetic models were correlated with the concentrations of active calcium oxide. The MRPD of both models was low indicating their reliability.
PB  - Elsevier
T2  - Fuel
T1  - The chicken eggshell calcium oxide ultrasonically dispersed over lignite coal fly ash-based cancrinite zeolite support as a catalyst for biodiesel production
VL  - 289
SP  - 119912
DO  - 10.1016/j.fuel.2020.119912
ER  - 
@article{
author = "Pavlović, Stefan and Marinković, Dalibor and Kostić, Milan and Lončarević, Davor and Mojović, Ljiljana and Stanković, Miroslav and Veljković, Vlada B.",
year = "2021",
abstract = "Lignite coal fly ash (FA) from a domestic thermal power plant was converted into a pure cancrinite zeolitic material (ZMFA) using a novel, custom-made, rotating autoclave reactor system by a short-term alkali activation process. The obtained ZMFA was used as catalyst support of calcium oxide as an active component derived from waste chicken eggshells (ES). The ZMFA supported calcium oxide catalyst (xCaO/ZMFA) was synthesized by means of the ultrasound-assisted method. The influence of different concentrations of dispersed calcium oxide (x = 5–20 wt%) over ZMFA and thermal treatment at different temperatures (450–600 °C) were studied. The structural and morphological characterization showed that the original cancrinite structure was preserved. The basicity and textural properties indicated the presence of strong active sites in a well-defined pore network suitable for the reactions of bulky organic compounds such as triacylglycerols (TAGs). The highest activity (96.5% of fatty acid methyl esters) in the methanolysis of sunflower oil was achieved with the 20CaO/ZMFA catalyst under reaction conditions: temperature of 60 °C, methanol/oil molar ratio of 12:1, catalyst concentration of 4 wt%, and reaction time of 2 h. It was found that the optimal calcination temperature of the catalyst precursor was 550 °C. At calcination temperatures above 550 °C, the melting of the glassy phase became more intense whereby the molten phase partially reacted with calcium oxide forming the catalytically inactive calcium silicate compounds (wollastonite, larnite, etc.). The rate constants of the two tested kinetic models were correlated with the concentrations of active calcium oxide. The MRPD of both models was low indicating their reliability.",
publisher = "Elsevier",
journal = "Fuel",
title = "The chicken eggshell calcium oxide ultrasonically dispersed over lignite coal fly ash-based cancrinite zeolite support as a catalyst for biodiesel production",
volume = "289",
pages = "119912",
doi = "10.1016/j.fuel.2020.119912"
}
Pavlović, S., Marinković, D., Kostić, M., Lončarević, D., Mojović, L., Stanković, M.,& Veljković, V. B.. (2021). The chicken eggshell calcium oxide ultrasonically dispersed over lignite coal fly ash-based cancrinite zeolite support as a catalyst for biodiesel production. in Fuel
Elsevier., 289, 119912.
https://doi.org/10.1016/j.fuel.2020.119912
Pavlović S, Marinković D, Kostić M, Lončarević D, Mojović L, Stanković M, Veljković VB. The chicken eggshell calcium oxide ultrasonically dispersed over lignite coal fly ash-based cancrinite zeolite support as a catalyst for biodiesel production. in Fuel. 2021;289:119912.
doi:10.1016/j.fuel.2020.119912 .
Pavlović, Stefan, Marinković, Dalibor, Kostić, Milan, Lončarević, Davor, Mojović, Ljiljana, Stanković, Miroslav, Veljković, Vlada B., "The chicken eggshell calcium oxide ultrasonically dispersed over lignite coal fly ash-based cancrinite zeolite support as a catalyst for biodiesel production" in Fuel, 289 (2021):119912,
https://doi.org/10.1016/j.fuel.2020.119912 . .
2
19
5
18

Occurence of Botryococcus terribilis Komárek & Marvan in the small sand pit lake – first report from Serbia

Ćirić, Miloš; Krizmanić, Jelena; Dojčinović, Biljana; Gavrilović, Bojan; Marinković, Dalibor

(Novi sad : Matica Srpska, 2021)

TY  - JOUR
AU  - Ćirić, Miloš
AU  - Krizmanić, Jelena
AU  - Dojčinović, Biljana
AU  - Gavrilović, Bojan
AU  - Marinković, Dalibor
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4927
AB  - Alkaline saline ponds and lakes are habitats with unique biodiversity. The green alga of the genus Botryococcus was accidentally discovered during a micro-algal survey of these habitats in Serbia. Species B. terribilis was found and identified for the first time in Serbia in the small sandpit lake of the Rusanda Nature Park. The first sampling was incomplete due to the unknown origin of the orange-red surface scum. After the identity of the species had been confirmed, three additional samplings were conducted aiming to collect phytoplankton and water samples for physical and chemical analyses. Major anions and cations were analysed in order to characterize the chemical type of sandpit lake, as well as nutrient content. Sandpit lake is an alkaline water body that belongs to sodium bicarbonate chemical type. Morphometric analysis of B. terribilis was performed using light and transmission electron microscopy. B. terribilis was found to be numerous in the phytoplankton community in late autumn and winter. Species from the genus Botryococcus are known as a rich source of different lipids and this discovery can be the first step in the further biotechnological application of this species in sustainable biofuel production.
PB  - Novi sad : Matica Srpska
T2  - Matica Srpska Journal for Natural Sciences / Zbornik Matice srpske za prirodne nauke
T1  - Occurence of Botryococcus terribilis Komárek & Marvan in the small sand pit lake – first report from Serbia
VL  - 57
IS  - 140
SP  - 45
DO  - 10.2298/ZMSPN2140045C
ER  - 
@article{
author = "Ćirić, Miloš and Krizmanić, Jelena and Dojčinović, Biljana and Gavrilović, Bojan and Marinković, Dalibor",
year = "2021",
abstract = "Alkaline saline ponds and lakes are habitats with unique biodiversity. The green alga of the genus Botryococcus was accidentally discovered during a micro-algal survey of these habitats in Serbia. Species B. terribilis was found and identified for the first time in Serbia in the small sandpit lake of the Rusanda Nature Park. The first sampling was incomplete due to the unknown origin of the orange-red surface scum. After the identity of the species had been confirmed, three additional samplings were conducted aiming to collect phytoplankton and water samples for physical and chemical analyses. Major anions and cations were analysed in order to characterize the chemical type of sandpit lake, as well as nutrient content. Sandpit lake is an alkaline water body that belongs to sodium bicarbonate chemical type. Morphometric analysis of B. terribilis was performed using light and transmission electron microscopy. B. terribilis was found to be numerous in the phytoplankton community in late autumn and winter. Species from the genus Botryococcus are known as a rich source of different lipids and this discovery can be the first step in the further biotechnological application of this species in sustainable biofuel production.",
publisher = "Novi sad : Matica Srpska",
journal = "Matica Srpska Journal for Natural Sciences / Zbornik Matice srpske za prirodne nauke",
title = "Occurence of Botryococcus terribilis Komárek & Marvan in the small sand pit lake – first report from Serbia",
volume = "57",
number = "140",
pages = "45",
doi = "10.2298/ZMSPN2140045C"
}
Ćirić, M., Krizmanić, J., Dojčinović, B., Gavrilović, B.,& Marinković, D.. (2021). Occurence of Botryococcus terribilis Komárek & Marvan in the small sand pit lake – first report from Serbia. in Matica Srpska Journal for Natural Sciences / Zbornik Matice srpske za prirodne nauke
Novi sad : Matica Srpska., 57(140), 45.
https://doi.org/10.2298/ZMSPN2140045C
Ćirić M, Krizmanić J, Dojčinović B, Gavrilović B, Marinković D. Occurence of Botryococcus terribilis Komárek & Marvan in the small sand pit lake – first report from Serbia. in Matica Srpska Journal for Natural Sciences / Zbornik Matice srpske za prirodne nauke. 2021;57(140):45.
doi:10.2298/ZMSPN2140045C .
Ćirić, Miloš, Krizmanić, Jelena, Dojčinović, Biljana, Gavrilović, Bojan, Marinković, Dalibor, "Occurence of Botryococcus terribilis Komárek & Marvan in the small sand pit lake – first report from Serbia" in Matica Srpska Journal for Natural Sciences / Zbornik Matice srpske za prirodne nauke, 57, no. 140 (2021):45,
https://doi.org/10.2298/ZMSPN2140045C . .
1

Transesterification of Sunflower Oil Over Waste Chicken Eggshell-Based Catalyst in a Microreactor: An Optimization Study

Pavlović, Stefan; Šelo, Gordana; Marinković, Dalibor; Planinić, Mirela; Tišma, Marina; Stanković, Miroslav

(MDPI, 2021)

TY  - JOUR
AU  - Pavlović, Stefan
AU  - Šelo, Gordana
AU  - Marinković, Dalibor
AU  - Planinić, Mirela
AU  - Tišma, Marina
AU  - Stanković, Miroslav
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4138
AB  - The statistical experimental design (DoE) and optimization (Response Surface Methodology combined with Box–Behnken design) of sunflower oil transesterification catalyzed by waste chicken eggshell-based catalyst were conducted in a custom-made microreactor at 60 °C. The catalyst was synthesized by the hydration–dehydration method and subsequent calcination at 600 °C. Comprehensive characterization of the obtained catalyst was conducted using: X-ray powder diffractometry (XRD), X-ray fluorescence (XRF), Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), N2 physisorption, and Hg-porosimetry. Structural, morphological, and textural results showed that the obtained catalyst exhibited high porosity and regular dispersity of plate-like CaO as an active species. The obtained optimal residence time, catalyst concentration, and methanol/oil volume ratio for the continuous reaction in microreactor were 10 min, 0.1 g g−1, and 3:1, respectively. The analysis of variance (ANOVA) showed that the obtained reduced quadratic model was adequate for experimental results fitting. The reaction in the microreactor was significantly intensified compared to a conventional batch reactor, as seen through the fatty acid methyl esters (FAMEs) content after 10 min, which was 51.2% and 18.6%, respectively.
PB  - MDPI
T2  - Micromachines
T1  - Transesterification of Sunflower Oil Over Waste Chicken Eggshell-Based Catalyst in a Microreactor: An Optimization Study
VL  - 12
IS  - 2
SP  - 120
DO  - 10.3390/mi12020120
ER  - 
@article{
author = "Pavlović, Stefan and Šelo, Gordana and Marinković, Dalibor and Planinić, Mirela and Tišma, Marina and Stanković, Miroslav",
year = "2021",
abstract = "The statistical experimental design (DoE) and optimization (Response Surface Methodology combined with Box–Behnken design) of sunflower oil transesterification catalyzed by waste chicken eggshell-based catalyst were conducted in a custom-made microreactor at 60 °C. The catalyst was synthesized by the hydration–dehydration method and subsequent calcination at 600 °C. Comprehensive characterization of the obtained catalyst was conducted using: X-ray powder diffractometry (XRD), X-ray fluorescence (XRF), Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), N2 physisorption, and Hg-porosimetry. Structural, morphological, and textural results showed that the obtained catalyst exhibited high porosity and regular dispersity of plate-like CaO as an active species. The obtained optimal residence time, catalyst concentration, and methanol/oil volume ratio for the continuous reaction in microreactor were 10 min, 0.1 g g−1, and 3:1, respectively. The analysis of variance (ANOVA) showed that the obtained reduced quadratic model was adequate for experimental results fitting. The reaction in the microreactor was significantly intensified compared to a conventional batch reactor, as seen through the fatty acid methyl esters (FAMEs) content after 10 min, which was 51.2% and 18.6%, respectively.",
publisher = "MDPI",
journal = "Micromachines",
title = "Transesterification of Sunflower Oil Over Waste Chicken Eggshell-Based Catalyst in a Microreactor: An Optimization Study",
volume = "12",
number = "2",
pages = "120",
doi = "10.3390/mi12020120"
}
Pavlović, S., Šelo, G., Marinković, D., Planinić, M., Tišma, M.,& Stanković, M.. (2021). Transesterification of Sunflower Oil Over Waste Chicken Eggshell-Based Catalyst in a Microreactor: An Optimization Study. in Micromachines
MDPI., 12(2), 120.
https://doi.org/10.3390/mi12020120
Pavlović S, Šelo G, Marinković D, Planinić M, Tišma M, Stanković M. Transesterification of Sunflower Oil Over Waste Chicken Eggshell-Based Catalyst in a Microreactor: An Optimization Study. in Micromachines. 2021;12(2):120.
doi:10.3390/mi12020120 .
Pavlović, Stefan, Šelo, Gordana, Marinković, Dalibor, Planinić, Mirela, Tišma, Marina, Stanković, Miroslav, "Transesterification of Sunflower Oil Over Waste Chicken Eggshell-Based Catalyst in a Microreactor: An Optimization Study" in Micromachines, 12, no. 2 (2021):120,
https://doi.org/10.3390/mi12020120 . .
3
14
3

Optimization of biodiesel production from waste cooking oil using waste-based CaO/Zeolite catalyst

Pavlović, Stefan; Marinković, Dalibor; Stanković, Miroslav

(Belgrade : Materials Research Society of Serbia, 2020)

TY  - CONF
AU  - Pavlović, Stefan
AU  - Marinković, Dalibor
AU  - Stanković, Miroslav
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4877
AB  - Lignite coal fly ash collected from Serbian thermal power plants was converted into value-added zeolite-like material using a Teflon-lined hydrothermal reactor in an alkali activation process at 150 ºC for 24 h. The obtained material was used in the synthesis of zeolite supported chicken eggshell calcium oxide catalyst for biodiesel synthesis from waste cooking oil using earlier established procedures. The study aimed to coupled optimization of catalyst synthesis parameters (CaO loading and calcination temperature) and biodiesel synthesis process (CaO concentration in the reaction mixture). The influence of calcination temperature in the catalyst activation stage was monitored by X-ray diffraction and FT-IR spectroscopy, whereas the reaction progress by the HPLC analysis. The analyzed calcination temperature range was within 450 ºC and 950 ºC, CaO loading in the range of 10 wt% - 50 wt%, whereas CaO concentration in the reaction mixture was within 2 wt% and 10 wt%. It is shown that calcination temperature strongly influences the final catalyst form, whereby the temperature higher than 700 ºC leads to the destruction of the initial zeolitic support and interaction of CaO with the melted glassy silicate phase making less-active or non-active calcium silicate phases. The highest fatty acid methyl esters content (>97 wt.%) was obtained using a catalyst with 44 wt.% of CaO and calcined at 523 ºC under the following reaction conditions, reaction temperature of 60 ºC, methanol to oil molar ratio of 1/12, catalyst concentration of 8.8 wt.%, and reaction time of 90 min.
PB  - Belgrade : Materials Research Society of Serbia
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - Programme and Book of Abstracts - Nineteenth Young Researchers' Conference, Materials Science and Engineering
T1  - Optimization of biodiesel production from waste cooking oil using waste-based CaO/Zeolite catalyst
SP  - 18
EP  - 18
UR  - https://hdl.handle.net/21.15107/rcub_cer_4877
ER  - 
@conference{
author = "Pavlović, Stefan and Marinković, Dalibor and Stanković, Miroslav",
year = "2020",
abstract = "Lignite coal fly ash collected from Serbian thermal power plants was converted into value-added zeolite-like material using a Teflon-lined hydrothermal reactor in an alkali activation process at 150 ºC for 24 h. The obtained material was used in the synthesis of zeolite supported chicken eggshell calcium oxide catalyst for biodiesel synthesis from waste cooking oil using earlier established procedures. The study aimed to coupled optimization of catalyst synthesis parameters (CaO loading and calcination temperature) and biodiesel synthesis process (CaO concentration in the reaction mixture). The influence of calcination temperature in the catalyst activation stage was monitored by X-ray diffraction and FT-IR spectroscopy, whereas the reaction progress by the HPLC analysis. The analyzed calcination temperature range was within 450 ºC and 950 ºC, CaO loading in the range of 10 wt% - 50 wt%, whereas CaO concentration in the reaction mixture was within 2 wt% and 10 wt%. It is shown that calcination temperature strongly influences the final catalyst form, whereby the temperature higher than 700 ºC leads to the destruction of the initial zeolitic support and interaction of CaO with the melted glassy silicate phase making less-active or non-active calcium silicate phases. The highest fatty acid methyl esters content (>97 wt.%) was obtained using a catalyst with 44 wt.% of CaO and calcined at 523 ºC under the following reaction conditions, reaction temperature of 60 ºC, methanol to oil molar ratio of 1/12, catalyst concentration of 8.8 wt.%, and reaction time of 90 min.",
publisher = "Belgrade : Materials Research Society of Serbia, Belgrade : Institute of Technical Sciences of SASA",
journal = "Programme and Book of Abstracts - Nineteenth Young Researchers' Conference, Materials Science and Engineering",
title = "Optimization of biodiesel production from waste cooking oil using waste-based CaO/Zeolite catalyst",
pages = "18-18",
url = "https://hdl.handle.net/21.15107/rcub_cer_4877"
}
Pavlović, S., Marinković, D.,& Stanković, M.. (2020). Optimization of biodiesel production from waste cooking oil using waste-based CaO/Zeolite catalyst. in Programme and Book of Abstracts - Nineteenth Young Researchers' Conference, Materials Science and Engineering
Belgrade : Materials Research Society of Serbia., 18-18.
https://hdl.handle.net/21.15107/rcub_cer_4877
Pavlović S, Marinković D, Stanković M. Optimization of biodiesel production from waste cooking oil using waste-based CaO/Zeolite catalyst. in Programme and Book of Abstracts - Nineteenth Young Researchers' Conference, Materials Science and Engineering. 2020;:18-18.
https://hdl.handle.net/21.15107/rcub_cer_4877 .
Pavlović, Stefan, Marinković, Dalibor, Stanković, Miroslav, "Optimization of biodiesel production from waste cooking oil using waste-based CaO/Zeolite catalyst" in Programme and Book of Abstracts - Nineteenth Young Researchers' Conference, Materials Science and Engineering (2020):18-18,
https://hdl.handle.net/21.15107/rcub_cer_4877 .

A CaO/zeolite-based catalyst obtained from waste chicken eggshell and coal fly ash for biodiesel production

Pavlović, Stefan; Marinković, Dalibor; Kostić, Milan; Janković-Častvan, Ivona; Mojović, Ljiljana; Stanković, Miroslav; Veljković, Vlada B.

(Elsevier, 2020)

TY  - JOUR
AU  - Pavlović, Stefan
AU  - Marinković, Dalibor
AU  - Kostić, Milan
AU  - Janković-Častvan, Ivona
AU  - Mojović, Ljiljana
AU  - Stanković, Miroslav
AU  - Veljković, Vlada B.
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3423
AB  - The present paper is focused on the development of a new environment-friendly methanolysis catalyst completely
based on waste materials: lignite coal fly ash and chicken eggshells. A novel catalyst based on CaO
supported on a fly ash-based zeolitic material (CaO/FA-ZM) was obtained from a cancrinite-sodalite group
zeolite-like material (vishnevite type) and active CaO by alkali activation in a new miniature autoclave reactor
system and hydration-dehydration. Agitation by rotation of the entire reaction mixture led to a more homogeneous
zeolitic product and saved both time and energy. The obtained catalyst structure corresponds to gismondine
and the crystallographic modification of calcium silicate (α’-dicalcium silicate) with deposited CaO.
The characteristics of the synthesized catalyst were determined using ED-XRF, XRD, FT-IR, SEM, Hg-porosimetry,
N2-physisorption, LDPSA, and Hammett indicators. The CaO/FA-ZM catalyst exhibited a high activity
(97.8% of FAME for only 30 min) and stability (a negligible drop in activity in five consecutive cycles) in the
methanolysis reaction under the optimal reaction conditions (temperature of 60 °C, methanol/oil molar ratio of
6:1, and catalyst concentration of 6 wt%). A kinetic study was performed using two different mechanisms: the
irreversible pseudo-first-order reaction mechanism in two regimes (heterogeneous and homogeneous) and the
changing mechanism combined with the triacylglycerol mass transfer limitation. Both models showed a satisfactory
agreement between the experimental and predicted values of conversion degree (R2 > 0.93), confirming
their validity for the CaO-based heterogeneously catalyzed methanolysis. The values of the activation
energy calculated for both mechanisms were 67.17 and 58.03 kJ mol−1, respectively.
PB  - Elsevier
T2  - Fuel
T1  - A CaO/zeolite-based catalyst obtained from waste chicken eggshell and coal fly ash for biodiesel production
VL  - 267
SP  - 117171
DO  - 10.1016/j.fuel.2020.117171
ER  - 
@article{
author = "Pavlović, Stefan and Marinković, Dalibor and Kostić, Milan and Janković-Častvan, Ivona and Mojović, Ljiljana and Stanković, Miroslav and Veljković, Vlada B.",
year = "2020",
abstract = "The present paper is focused on the development of a new environment-friendly methanolysis catalyst completely
based on waste materials: lignite coal fly ash and chicken eggshells. A novel catalyst based on CaO
supported on a fly ash-based zeolitic material (CaO/FA-ZM) was obtained from a cancrinite-sodalite group
zeolite-like material (vishnevite type) and active CaO by alkali activation in a new miniature autoclave reactor
system and hydration-dehydration. Agitation by rotation of the entire reaction mixture led to a more homogeneous
zeolitic product and saved both time and energy. The obtained catalyst structure corresponds to gismondine
and the crystallographic modification of calcium silicate (α’-dicalcium silicate) with deposited CaO.
The characteristics of the synthesized catalyst were determined using ED-XRF, XRD, FT-IR, SEM, Hg-porosimetry,
N2-physisorption, LDPSA, and Hammett indicators. The CaO/FA-ZM catalyst exhibited a high activity
(97.8% of FAME for only 30 min) and stability (a negligible drop in activity in five consecutive cycles) in the
methanolysis reaction under the optimal reaction conditions (temperature of 60 °C, methanol/oil molar ratio of
6:1, and catalyst concentration of 6 wt%). A kinetic study was performed using two different mechanisms: the
irreversible pseudo-first-order reaction mechanism in two regimes (heterogeneous and homogeneous) and the
changing mechanism combined with the triacylglycerol mass transfer limitation. Both models showed a satisfactory
agreement between the experimental and predicted values of conversion degree (R2 > 0.93), confirming
their validity for the CaO-based heterogeneously catalyzed methanolysis. The values of the activation
energy calculated for both mechanisms were 67.17 and 58.03 kJ mol−1, respectively.",
publisher = "Elsevier",
journal = "Fuel",
title = "A CaO/zeolite-based catalyst obtained from waste chicken eggshell and coal fly ash for biodiesel production",
volume = "267",
pages = "117171",
doi = "10.1016/j.fuel.2020.117171"
}
Pavlović, S., Marinković, D., Kostić, M., Janković-Častvan, I., Mojović, L., Stanković, M.,& Veljković, V. B.. (2020). A CaO/zeolite-based catalyst obtained from waste chicken eggshell and coal fly ash for biodiesel production. in Fuel
Elsevier., 267, 117171.
https://doi.org/10.1016/j.fuel.2020.117171
Pavlović S, Marinković D, Kostić M, Janković-Častvan I, Mojović L, Stanković M, Veljković VB. A CaO/zeolite-based catalyst obtained from waste chicken eggshell and coal fly ash for biodiesel production. in Fuel. 2020;267:117171.
doi:10.1016/j.fuel.2020.117171 .
Pavlović, Stefan, Marinković, Dalibor, Kostić, Milan, Janković-Častvan, Ivona, Mojović, Ljiljana, Stanković, Miroslav, Veljković, Vlada B., "A CaO/zeolite-based catalyst obtained from waste chicken eggshell and coal fly ash for biodiesel production" in Fuel, 267 (2020):117171,
https://doi.org/10.1016/j.fuel.2020.117171 . .
69
32
70

Solid green biodiesel catalysts derived from coal fly ash

Stanković, Miroslav; Pavlović, Stefan; Marinković, Dalibor; Tišma, Marina; Gabrovska, Margarita; Nikolova, Dimitrinka

(IntechOpen, 2020)

TY  - CHAP
AU  - Stanković, Miroslav
AU  - Pavlović, Stefan
AU  - Marinković, Dalibor
AU  - Tišma, Marina
AU  - Gabrovska, Margarita
AU  - Nikolova, Dimitrinka
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3743
AB  - Coal fly ash (CFA) is generated during the combustion of coal for energy production. Many studies are based on its utilization as the most abundant, cheap
aluminosilicate industrial residue, which is recognized as a risk for the environment and human health. The present review is focused on CFA origin, chemical properties, and its catalytic application for biodiesel production. The aluminosilicate nature and the presence of rare earth elements make CFA suitable for different adsorption, catalytic, and extraction processes for obtaining valuable products including alternative fuels and pure elements. However, the presence of toxic elements is a potential environmental problem, which should be solved in order to avoid soil, water, and air pollution. The most used modification methods are alkali activation, hydrothermal, and thermal treatment that improve the structural, morphological, and textural properties. The active catalytic form could be obtained by impregnation or ion exchange method. It was found that such synthesized materials have significant catalytic potential in the biofuel chemistry. In the case of biodiesel production, the high values of conversion or yield can be achieved under mild low-energy reaction conditions in the presence of low-cost waste-based catalysts.
PB  - IntechOpen
T2  - Renewable Energy – Resources, Challenges and Applications
T1  - Solid green biodiesel catalysts derived from coal fly ash
SP  - 185
EP  - 208
DO  - 10.5772/intechopen.91703
ER  - 
@inbook{
author = "Stanković, Miroslav and Pavlović, Stefan and Marinković, Dalibor and Tišma, Marina and Gabrovska, Margarita and Nikolova, Dimitrinka",
year = "2020",
abstract = "Coal fly ash (CFA) is generated during the combustion of coal for energy production. Many studies are based on its utilization as the most abundant, cheap
aluminosilicate industrial residue, which is recognized as a risk for the environment and human health. The present review is focused on CFA origin, chemical properties, and its catalytic application for biodiesel production. The aluminosilicate nature and the presence of rare earth elements make CFA suitable for different adsorption, catalytic, and extraction processes for obtaining valuable products including alternative fuels and pure elements. However, the presence of toxic elements is a potential environmental problem, which should be solved in order to avoid soil, water, and air pollution. The most used modification methods are alkali activation, hydrothermal, and thermal treatment that improve the structural, morphological, and textural properties. The active catalytic form could be obtained by impregnation or ion exchange method. It was found that such synthesized materials have significant catalytic potential in the biofuel chemistry. In the case of biodiesel production, the high values of conversion or yield can be achieved under mild low-energy reaction conditions in the presence of low-cost waste-based catalysts.",
publisher = "IntechOpen",
journal = "Renewable Energy – Resources, Challenges and Applications",
booktitle = "Solid green biodiesel catalysts derived from coal fly ash",
pages = "185-208",
doi = "10.5772/intechopen.91703"
}
Stanković, M., Pavlović, S., Marinković, D., Tišma, M., Gabrovska, M.,& Nikolova, D.. (2020). Solid green biodiesel catalysts derived from coal fly ash. in Renewable Energy – Resources, Challenges and Applications
IntechOpen., 185-208.
https://doi.org/10.5772/intechopen.91703
Stanković M, Pavlović S, Marinković D, Tišma M, Gabrovska M, Nikolova D. Solid green biodiesel catalysts derived from coal fly ash. in Renewable Energy – Resources, Challenges and Applications. 2020;:185-208.
doi:10.5772/intechopen.91703 .
Stanković, Miroslav, Pavlović, Stefan, Marinković, Dalibor, Tišma, Marina, Gabrovska, Margarita, Nikolova, Dimitrinka, "Solid green biodiesel catalysts derived from coal fly ash" in Renewable Energy – Resources, Challenges and Applications (2020):185-208,
https://doi.org/10.5772/intechopen.91703 . .
1
4

Optimization of heterogeneously catalyzed methanolysis in microreactor using a green eggshell catalyst

Pavlović, Stefan; Marinković, Dalibor; Tišma, Marina; Stanković, Miroslav

(Cluster of Excellence The Fuel Science Center, 2020)

TY  - CONF
AU  - Pavlović, Stefan
AU  - Marinković, Dalibor
AU  - Tišma, Marina
AU  - Stanković, Miroslav
PY  - 2020
UR  - https://www.fuelcenter.rwth-aachen.de/cms/Fuelcenter/Austausch/Internationale-Konferenz/~dcsks/8-Internationale-Konferenz/lidx/1/
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3744
AB  - Calcium oxide was derived from chicken eggshell (ES) by calcination at 900 °C. To improve catalyst performance, the catalyst was treated by the hydration-dehydration method. The new catalyst, with improved structural and morphological properties, denoted as ESHC-600, was obtained and used in methanolysis reaction. Methanolysis reaction was carried out in a microreactor system equipped with two microfluidic syringe pumps. ESHC-600 catalyst was suspended in sunflower oil and added in the first syringe, whereas methanol was placed in the second one. Microchannel with an internal diameter of 0.6 mm was connected with syringes by a T-shaped three-way junction and immersed in the thermostated water bath (60 °C). The reaction parameters are optimized in the following range: catalyst concentration (0.05, 0.075, and 0.1 g/g), methanol to oil volume ratio (1:2, 2:1, and 3:1) and residence time (4, 7, and 10 min). Design of the experiment was created according to three-level full functional design. The response variable was FAME content, which was determined by the HPLC method. It can be noted, that the catalyst exhibits satisfactory catalytic activity in such specific reactor systems in which two immiscible liquids and a solid catalyst interact at a micro-level. Namely, each segment represents one microreactor, thus achieving enhanced miscibility with suppressing external diffusion limitations. Determined optimal reaction conditions were: catalyst concentration of 10 wt%, methanol to oil volume ratio of 3:1, and residence time of 10 min. FAME content in microreactor (54.8 % FAME) was 5 times higher compared with the reaction in a batch reactor (10.3 % FAME) under optimal conditions. Also, it is important to note that potential problem in such microreactor systems represents catalyst precipitation in the syringe, which is particularly pronounced at longer residence time. Such behavior of the catalyst leads to a decline of catalytic activity due to non-uniformly catalyst concentration during the reaction, which can be overcome by pre-treatment of the catalyst-oil suspension under ultrasonic conditions. According to obtained results, such designed reaction systems can be used in biodiesel production in a large scale using sustainable, green, and energy-efficient processes, whereby productivity would be increased by connecting more of these reactors in series.
PB  - Cluster of Excellence The Fuel Science Center
T1  - Optimization of heterogeneously catalyzed methanolysis in microreactor using a green eggshell catalyst
UR  - https://hdl.handle.net/21.15107/rcub_cer_3744
ER  - 
@conference{
author = "Pavlović, Stefan and Marinković, Dalibor and Tišma, Marina and Stanković, Miroslav",
year = "2020",
abstract = "Calcium oxide was derived from chicken eggshell (ES) by calcination at 900 °C. To improve catalyst performance, the catalyst was treated by the hydration-dehydration method. The new catalyst, with improved structural and morphological properties, denoted as ESHC-600, was obtained and used in methanolysis reaction. Methanolysis reaction was carried out in a microreactor system equipped with two microfluidic syringe pumps. ESHC-600 catalyst was suspended in sunflower oil and added in the first syringe, whereas methanol was placed in the second one. Microchannel with an internal diameter of 0.6 mm was connected with syringes by a T-shaped three-way junction and immersed in the thermostated water bath (60 °C). The reaction parameters are optimized in the following range: catalyst concentration (0.05, 0.075, and 0.1 g/g), methanol to oil volume ratio (1:2, 2:1, and 3:1) and residence time (4, 7, and 10 min). Design of the experiment was created according to three-level full functional design. The response variable was FAME content, which was determined by the HPLC method. It can be noted, that the catalyst exhibits satisfactory catalytic activity in such specific reactor systems in which two immiscible liquids and a solid catalyst interact at a micro-level. Namely, each segment represents one microreactor, thus achieving enhanced miscibility with suppressing external diffusion limitations. Determined optimal reaction conditions were: catalyst concentration of 10 wt%, methanol to oil volume ratio of 3:1, and residence time of 10 min. FAME content in microreactor (54.8 % FAME) was 5 times higher compared with the reaction in a batch reactor (10.3 % FAME) under optimal conditions. Also, it is important to note that potential problem in such microreactor systems represents catalyst precipitation in the syringe, which is particularly pronounced at longer residence time. Such behavior of the catalyst leads to a decline of catalytic activity due to non-uniformly catalyst concentration during the reaction, which can be overcome by pre-treatment of the catalyst-oil suspension under ultrasonic conditions. According to obtained results, such designed reaction systems can be used in biodiesel production in a large scale using sustainable, green, and energy-efficient processes, whereby productivity would be increased by connecting more of these reactors in series.",
publisher = "Cluster of Excellence The Fuel Science Center",
title = "Optimization of heterogeneously catalyzed methanolysis in microreactor using a green eggshell catalyst",
url = "https://hdl.handle.net/21.15107/rcub_cer_3744"
}
Pavlović, S., Marinković, D., Tišma, M.,& Stanković, M.. (2020). Optimization of heterogeneously catalyzed methanolysis in microreactor using a green eggshell catalyst. 
Cluster of Excellence The Fuel Science Center..
https://hdl.handle.net/21.15107/rcub_cer_3744
Pavlović S, Marinković D, Tišma M, Stanković M. Optimization of heterogeneously catalyzed methanolysis in microreactor using a green eggshell catalyst. 2020;.
https://hdl.handle.net/21.15107/rcub_cer_3744 .
Pavlović, Stefan, Marinković, Dalibor, Tišma, Marina, Stanković, Miroslav, "Optimization of heterogeneously catalyzed methanolysis in microreactor using a green eggshell catalyst" (2020),
https://hdl.handle.net/21.15107/rcub_cer_3744 .

Effects of preparation conditions on the catalytic activity of chicken eggshell catalysts for the transesterification of oils to biodiesel

Pavlović, Stefan; Marinković, Dalibor; Milovanović, Biljana; Kostić, Milan; Gabrovska, Margarita; Nikolova, Dimitrinka; Stanković, Miroslav

(DECHEMA e.V., 2019)

TY  - CONF
AU  - Pavlović, Stefan
AU  - Marinković, Dalibor
AU  - Milovanović, Biljana
AU  - Kostić, Milan
AU  - Gabrovska, Margarita
AU  - Nikolova, Dimitrinka
AU  - Stanković, Miroslav
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3434
AB  - Eggshell based catalysts were synthesized by calcination (600 and 900 ºC, 4 h) of raw and rehydration (RH) modified (RH-temperature of 80 ºC, S/L ratio of 1/5, and RH-time of 6 h) eggshell. After RH-treatment, the sample underwent calcination at 600 ºC, 4 h. Obtained catalysts were characterized by XRD, SEM, N2-physisorption, and Hg-porosimetry, whereas the catalytic activity was analyzed in a batch reactor (reaction temperature of 60 ºC, sunflower oil/methanol molar ratio of 1/12, and catalyst concentration of 4 wt.%). The concentration of fatty acid methyl esters (FAMEs) was determined by HPLC. The reaction has reached equilibrium (FAME > 97%) with rehydrated catalyst for 1.5 h, whereas with catalyst calcined at 900 ºC for 4 h.
PB  - DECHEMA e.V.
C3  - 14th EuropaCat – European Congress on Catalysis “Catalysis without Borders”
T1  - Effects of preparation conditions on the catalytic activity of chicken eggshell catalysts for the transesterification of oils to biodiesel
SP  - 643
EP  - 644
UR  - https://hdl.handle.net/21.15107/rcub_cer_3434
ER  - 
@conference{
author = "Pavlović, Stefan and Marinković, Dalibor and Milovanović, Biljana and Kostić, Milan and Gabrovska, Margarita and Nikolova, Dimitrinka and Stanković, Miroslav",
year = "2019",
abstract = "Eggshell based catalysts were synthesized by calcination (600 and 900 ºC, 4 h) of raw and rehydration (RH) modified (RH-temperature of 80 ºC, S/L ratio of 1/5, and RH-time of 6 h) eggshell. After RH-treatment, the sample underwent calcination at 600 ºC, 4 h. Obtained catalysts were characterized by XRD, SEM, N2-physisorption, and Hg-porosimetry, whereas the catalytic activity was analyzed in a batch reactor (reaction temperature of 60 ºC, sunflower oil/methanol molar ratio of 1/12, and catalyst concentration of 4 wt.%). The concentration of fatty acid methyl esters (FAMEs) was determined by HPLC. The reaction has reached equilibrium (FAME > 97%) with rehydrated catalyst for 1.5 h, whereas with catalyst calcined at 900 ºC for 4 h.",
publisher = "DECHEMA e.V.",
journal = "14th EuropaCat – European Congress on Catalysis “Catalysis without Borders”",
title = "Effects of preparation conditions on the catalytic activity of chicken eggshell catalysts for the transesterification of oils to biodiesel",
pages = "643-644",
url = "https://hdl.handle.net/21.15107/rcub_cer_3434"
}
Pavlović, S., Marinković, D., Milovanović, B., Kostić, M., Gabrovska, M., Nikolova, D.,& Stanković, M.. (2019). Effects of preparation conditions on the catalytic activity of chicken eggshell catalysts for the transesterification of oils to biodiesel. in 14th EuropaCat – European Congress on Catalysis “Catalysis without Borders”
DECHEMA e.V.., 643-644.
https://hdl.handle.net/21.15107/rcub_cer_3434
Pavlović S, Marinković D, Milovanović B, Kostić M, Gabrovska M, Nikolova D, Stanković M. Effects of preparation conditions on the catalytic activity of chicken eggshell catalysts for the transesterification of oils to biodiesel. in 14th EuropaCat – European Congress on Catalysis “Catalysis without Borders”. 2019;:643-644.
https://hdl.handle.net/21.15107/rcub_cer_3434 .
Pavlović, Stefan, Marinković, Dalibor, Milovanović, Biljana, Kostić, Milan, Gabrovska, Margarita, Nikolova, Dimitrinka, Stanković, Miroslav, "Effects of preparation conditions on the catalytic activity of chicken eggshell catalysts for the transesterification of oils to biodiesel" in 14th EuropaCat – European Congress on Catalysis “Catalysis without Borders” (2019):643-644,
https://hdl.handle.net/21.15107/rcub_cer_3434 .

Calcium oxide on coal fly ash cancrinite-type zeolite as a catalyst for biodiesel production

Pavlović, Stefan; Banković, Predrag; Marinković, Dalibor; Stanković, Miroslav

(Serbian Ceramic Society, 2019)

TY  - CONF
AU  - Pavlović, Stefan
AU  - Banković, Predrag
AU  - Marinković, Dalibor
AU  - Stanković, Miroslav
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3397
AB  - This paper discloses the synthesis of new supported catalyst in which the main components of the catalyst, catalyst support and active component, derived from waste material, and its catalytic properties tested in the reaction of the production of biodiesel. Cancrinite-type zeolite catalyst support was synthesized from coal fly ash using hydrothermal technique with NaOH as the activation reagent in a rotating PTFE autoclave reactor. The active component, CaO, was derived from waste chicken eggshells by calcination at 900 °C. Supported catalytic material was synthesized by impregnation. The content of CaO in the prepared catalysts was varied from 5 to 20 wt%. The catalysts were characterized using XRD, FT-IR, SEM, N2-physisorption, and Hg-porosimetry. The methanolysis of sunflower oil was carried out in a batch reactor at 60 °C, with
methanol to oil molar ratio of 12:1, and catalyst concentration of 4 wt.%. The fatty acid methyl ester content (% FAME) was analyzed using HPLC method. Structural information related to phase identification and vibration of chemical bonds in molecular units indicates that a multiphase zeolitic structure was obtained. The structure of cancrinite-type zeolite was found to be dominantly present. It was found that the catalyst impregnated with 20% of CaO gave the highest FAME percentage of 96.46 for the reaction time of 2 h.
PB  - Serbian Ceramic Society
C3  - Serbian Ceramic Society Conference, ADVANCED CERAMICS AND APPLICATION VIII, New Frontiers in Multifunctional Material Science and Processing
T1  - Calcium oxide on coal fly ash cancrinite-type zeolite as a catalyst for biodiesel production
SP  - 43
UR  - https://hdl.handle.net/21.15107/rcub_cer_3397
ER  - 
@conference{
author = "Pavlović, Stefan and Banković, Predrag and Marinković, Dalibor and Stanković, Miroslav",
year = "2019",
abstract = "This paper discloses the synthesis of new supported catalyst in which the main components of the catalyst, catalyst support and active component, derived from waste material, and its catalytic properties tested in the reaction of the production of biodiesel. Cancrinite-type zeolite catalyst support was synthesized from coal fly ash using hydrothermal technique with NaOH as the activation reagent in a rotating PTFE autoclave reactor. The active component, CaO, was derived from waste chicken eggshells by calcination at 900 °C. Supported catalytic material was synthesized by impregnation. The content of CaO in the prepared catalysts was varied from 5 to 20 wt%. The catalysts were characterized using XRD, FT-IR, SEM, N2-physisorption, and Hg-porosimetry. The methanolysis of sunflower oil was carried out in a batch reactor at 60 °C, with
methanol to oil molar ratio of 12:1, and catalyst concentration of 4 wt.%. The fatty acid methyl ester content (% FAME) was analyzed using HPLC method. Structural information related to phase identification and vibration of chemical bonds in molecular units indicates that a multiphase zeolitic structure was obtained. The structure of cancrinite-type zeolite was found to be dominantly present. It was found that the catalyst impregnated with 20% of CaO gave the highest FAME percentage of 96.46 for the reaction time of 2 h.",
publisher = "Serbian Ceramic Society",
journal = "Serbian Ceramic Society Conference, ADVANCED CERAMICS AND APPLICATION VIII, New Frontiers in Multifunctional Material Science and Processing",
title = "Calcium oxide on coal fly ash cancrinite-type zeolite as a catalyst for biodiesel production",
pages = "43",
url = "https://hdl.handle.net/21.15107/rcub_cer_3397"
}
Pavlović, S., Banković, P., Marinković, D.,& Stanković, M.. (2019). Calcium oxide on coal fly ash cancrinite-type zeolite as a catalyst for biodiesel production. in Serbian Ceramic Society Conference, ADVANCED CERAMICS AND APPLICATION VIII, New Frontiers in Multifunctional Material Science and Processing
Serbian Ceramic Society., 43.
https://hdl.handle.net/21.15107/rcub_cer_3397
Pavlović S, Banković P, Marinković D, Stanković M. Calcium oxide on coal fly ash cancrinite-type zeolite as a catalyst for biodiesel production. in Serbian Ceramic Society Conference, ADVANCED CERAMICS AND APPLICATION VIII, New Frontiers in Multifunctional Material Science and Processing. 2019;:43.
https://hdl.handle.net/21.15107/rcub_cer_3397 .
Pavlović, Stefan, Banković, Predrag, Marinković, Dalibor, Stanković, Miroslav, "Calcium oxide on coal fly ash cancrinite-type zeolite as a catalyst for biodiesel production" in Serbian Ceramic Society Conference, ADVANCED CERAMICS AND APPLICATION VIII, New Frontiers in Multifunctional Material Science and Processing (2019):43,
https://hdl.handle.net/21.15107/rcub_cer_3397 .

Novi tehnološki postupak dobijanja biodizela metanolizom ulja kukuruznih klica u prisustvu pepela kukuruzne kurdeljke kao katalizatora

Kostić, Milan; Đalović, Ivica; Mitrović, Petar; Pavlović, Stefan; Marinković, Dalibor; Nježić, Zvonko; Stamenković, Olivera; Veljković, Vlada B.

(Univerzitet u Nišu -Tehnloški fakultet u Leskovcu, 2019)

TY  - GEN
AU  - Kostić, Milan
AU  - Đalović, Ivica
AU  - Mitrović, Petar
AU  - Pavlović, Stefan
AU  - Marinković, Dalibor
AU  - Nježić, Zvonko
AU  - Stamenković, Olivera
AU  - Veljković, Vlada B.
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3809
AB  - Tehničko rešenje pripada oblasti hemijske tehnologije i predstavlja
tehnološki postupak za sintezu metil estara masnih kiselina (MEMK) iz ulja
kukuruznih klica (UKK) primenom pepela dobijenog sagorevanjem kurdeljke
kukuruza kao katalizatora.
PB  - Univerzitet u Nišu -Tehnloški fakultet u Leskovcu
T1  - Novi tehnološki postupak dobijanja biodizela metanolizom ulja kukuruznih klica u prisustvu pepela kukuruzne kurdeljke kao katalizatora
UR  - https://hdl.handle.net/21.15107/rcub_cer_3809
ER  - 
@misc{
author = "Kostić, Milan and Đalović, Ivica and Mitrović, Petar and Pavlović, Stefan and Marinković, Dalibor and Nježić, Zvonko and Stamenković, Olivera and Veljković, Vlada B.",
year = "2019",
abstract = "Tehničko rešenje pripada oblasti hemijske tehnologije i predstavlja
tehnološki postupak za sintezu metil estara masnih kiselina (MEMK) iz ulja
kukuruznih klica (UKK) primenom pepela dobijenog sagorevanjem kurdeljke
kukuruza kao katalizatora.",
publisher = "Univerzitet u Nišu -Tehnloški fakultet u Leskovcu",
title = "Novi tehnološki postupak dobijanja biodizela metanolizom ulja kukuruznih klica u prisustvu pepela kukuruzne kurdeljke kao katalizatora",
url = "https://hdl.handle.net/21.15107/rcub_cer_3809"
}
Kostić, M., Đalović, I., Mitrović, P., Pavlović, S., Marinković, D., Nježić, Z., Stamenković, O.,& Veljković, V. B.. (2019). Novi tehnološki postupak dobijanja biodizela metanolizom ulja kukuruznih klica u prisustvu pepela kukuruzne kurdeljke kao katalizatora. 
Univerzitet u Nišu -Tehnloški fakultet u Leskovcu..
https://hdl.handle.net/21.15107/rcub_cer_3809
Kostić M, Đalović I, Mitrović P, Pavlović S, Marinković D, Nježić Z, Stamenković O, Veljković VB. Novi tehnološki postupak dobijanja biodizela metanolizom ulja kukuruznih klica u prisustvu pepela kukuruzne kurdeljke kao katalizatora. 2019;.
https://hdl.handle.net/21.15107/rcub_cer_3809 .
Kostić, Milan, Đalović, Ivica, Mitrović, Petar, Pavlović, Stefan, Marinković, Dalibor, Nježić, Zvonko, Stamenković, Olivera, Veljković, Vlada B., "Novi tehnološki postupak dobijanja biodizela metanolizom ulja kukuruznih klica u prisustvu pepela kukuruzne kurdeljke kao katalizatora" (2019),
https://hdl.handle.net/21.15107/rcub_cer_3809 .

Deactivation Aspects of Methanolysis Catalyst Based on CaO Loaded on Mesoporous Carrier

Marinković, Dalibor; Pavlović, Stefan; Stanković, Miroslav

(Faculty of Technology Zvornik, 2019)

TY  - CONF
AU  - Marinković, Dalibor
AU  - Pavlović, Stefan
AU  - Stanković, Miroslav
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2888
AB  - With the depletion of fossil fuels as a source for fuels and energy, the share of energy supplied by
renewable resources such as biomass can be expected to increase in the anticipated future.
Biodiesel, composed of fatty acid methyl esters (FAME), is one of the renewable alternative to
fosil fuels which is most common obtained in catalyzed transesterification reaction of
triacylglycerols (TAG). Naydays, the most promicing process is considered continuous basic
heterogeneously-catalyzed methanolysis of sustainable sources of TAG. Heterogeneouslycatalyzed
process has numerus advantages, but some drowbacks also exists. One of the main
concern is catalyst stability and durability. The aim of this study is catalyst durability
investigation and determination of the deactivation mechanisms on the case of CaO loaded onto
mesoporous neutral carrier. The experiments were carried out in continuous packed bed tubular
reactor (PBR) under mild reaction conditions. The CaO-based catalyst showed high activity in
continuos reaction conditions during the first 30 h of operation, the FAME content was higher
then 91.5%. After 30 h the catalyst activity began to decrease, so that after 36 h the FAME
content was only 36%. The analysis of the morphology and the present functional groups on the
surface of the catalyst before and after the reaction clearly showed a massive deposition of
organic molecules from the reaction mixture on the surface of the catalyst. Since the loss of the
active species by leaching was negligible, the sheltering of the catalytic active sites by such
massive deposition of the organic molecule resulted in a decrease in the activity of the used
CaO-based catalyst.
PB  - Faculty of Technology Zvornik
C3  - Proceedings of VI International Congress "Engineering, Environment and Materials in Processing Industry", Faculty of Technology Zvornik
T1  - Deactivation Aspects of Methanolysis Catalyst Based on CaO Loaded on Mesoporous Carrier
SP  - 59
EP  - 64
DO  - 10.7251/EEMEN1901059M
ER  - 
@conference{
author = "Marinković, Dalibor and Pavlović, Stefan and Stanković, Miroslav",
year = "2019",
abstract = "With the depletion of fossil fuels as a source for fuels and energy, the share of energy supplied by
renewable resources such as biomass can be expected to increase in the anticipated future.
Biodiesel, composed of fatty acid methyl esters (FAME), is one of the renewable alternative to
fosil fuels which is most common obtained in catalyzed transesterification reaction of
triacylglycerols (TAG). Naydays, the most promicing process is considered continuous basic
heterogeneously-catalyzed methanolysis of sustainable sources of TAG. Heterogeneouslycatalyzed
process has numerus advantages, but some drowbacks also exists. One of the main
concern is catalyst stability and durability. The aim of this study is catalyst durability
investigation and determination of the deactivation mechanisms on the case of CaO loaded onto
mesoporous neutral carrier. The experiments were carried out in continuous packed bed tubular
reactor (PBR) under mild reaction conditions. The CaO-based catalyst showed high activity in
continuos reaction conditions during the first 30 h of operation, the FAME content was higher
then 91.5%. After 30 h the catalyst activity began to decrease, so that after 36 h the FAME
content was only 36%. The analysis of the morphology and the present functional groups on the
surface of the catalyst before and after the reaction clearly showed a massive deposition of
organic molecules from the reaction mixture on the surface of the catalyst. Since the loss of the
active species by leaching was negligible, the sheltering of the catalytic active sites by such
massive deposition of the organic molecule resulted in a decrease in the activity of the used
CaO-based catalyst.",
publisher = "Faculty of Technology Zvornik",
journal = "Proceedings of VI International Congress "Engineering, Environment and Materials in Processing Industry", Faculty of Technology Zvornik",
title = "Deactivation Aspects of Methanolysis Catalyst Based on CaO Loaded on Mesoporous Carrier",
pages = "59-64",
doi = "10.7251/EEMEN1901059M"
}
Marinković, D., Pavlović, S.,& Stanković, M.. (2019). Deactivation Aspects of Methanolysis Catalyst Based on CaO Loaded on Mesoporous Carrier. in Proceedings of VI International Congress "Engineering, Environment and Materials in Processing Industry", Faculty of Technology Zvornik
Faculty of Technology Zvornik., 59-64.
https://doi.org/10.7251/EEMEN1901059M
Marinković D, Pavlović S, Stanković M. Deactivation Aspects of Methanolysis Catalyst Based on CaO Loaded on Mesoporous Carrier. in Proceedings of VI International Congress "Engineering, Environment and Materials in Processing Industry", Faculty of Technology Zvornik. 2019;:59-64.
doi:10.7251/EEMEN1901059M .
Marinković, Dalibor, Pavlović, Stefan, Stanković, Miroslav, "Deactivation Aspects of Methanolysis Catalyst Based on CaO Loaded on Mesoporous Carrier" in Proceedings of VI International Congress "Engineering, Environment and Materials in Processing Industry", Faculty of Technology Zvornik (2019):59-64,
https://doi.org/10.7251/EEMEN1901059M . .

Biodiesel synthesis over green catalyst: The effect of thermal treatment of CaO/Zeolite precursor on catalytic activity

Paunović, Anđela; Pavlović, Stefan; Marinković, Dalibor; Mojović, Ljiljana

(Belgrade : Serbian Chemical Society, 2019)

TY  - CONF
AU  - Paunović, Anđela
AU  - Pavlović, Stefan
AU  - Marinković, Dalibor
AU  - Mojović, Ljiljana
PY  - 2019
UR  - http://www.kmhem.net/aec_events/sedma-konferencija-mladih-hemicara-srbije/
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3748
AB  - The green CaO/Zeolite catalyst for methanolysis of fatty oils was synthesized entirely from the waste materials. CaO derived from chicken eggshell was loaded onto fly ashbased zeolite catalyst carrier by the wet impregnation method using an alcohol solution. The effect of thermal activation at different temperatures ranging from 450 to 600 °C on catalytic activity was studied. The precursor and catalyst samples were characterized by XRD, FTIR, SEM, and Hg-porosimetry techniques. The catalytic tests were performed in a stirred batch reactor at the following reaction conditions: 60 °C - reaction temperature, 12:1 - methanol/oil molar ratio, and 4 wt% - catalyst concentration. The obtained results showed that the synthesized CaO/Zeolite catalyst has preserved alumosilicate framework-cancrinite type [1], with uniformly distributed calcium oxide (CaO) on its surface (Fig. 1c). It is shown that the catalyst sample calcinated at 550 °C exhibited the highest FAME content of 96.46%, which was achieved in 2 h (Fig. 2). Increasing temperature of calcination above 550 °C led to the formation of inactive calcium alumosilicate forms causing a decrease in the FAME content.
PB  - Belgrade : Serbian Chemical Society
C3  - Book of abstracts - Seventh Conference of the Young Chemists of Serbia
T1  - Biodiesel synthesis over green catalyst: The effect of thermal treatment of CaO/Zeolite precursor on catalytic activity
SP  - 101
EP  - 101
UR  - https://hdl.handle.net/21.15107/rcub_cer_3748
ER  - 
@conference{
author = "Paunović, Anđela and Pavlović, Stefan and Marinković, Dalibor and Mojović, Ljiljana",
year = "2019",
abstract = "The green CaO/Zeolite catalyst for methanolysis of fatty oils was synthesized entirely from the waste materials. CaO derived from chicken eggshell was loaded onto fly ashbased zeolite catalyst carrier by the wet impregnation method using an alcohol solution. The effect of thermal activation at different temperatures ranging from 450 to 600 °C on catalytic activity was studied. The precursor and catalyst samples were characterized by XRD, FTIR, SEM, and Hg-porosimetry techniques. The catalytic tests were performed in a stirred batch reactor at the following reaction conditions: 60 °C - reaction temperature, 12:1 - methanol/oil molar ratio, and 4 wt% - catalyst concentration. The obtained results showed that the synthesized CaO/Zeolite catalyst has preserved alumosilicate framework-cancrinite type [1], with uniformly distributed calcium oxide (CaO) on its surface (Fig. 1c). It is shown that the catalyst sample calcinated at 550 °C exhibited the highest FAME content of 96.46%, which was achieved in 2 h (Fig. 2). Increasing temperature of calcination above 550 °C led to the formation of inactive calcium alumosilicate forms causing a decrease in the FAME content.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "Book of abstracts - Seventh Conference of the Young Chemists of Serbia",
title = "Biodiesel synthesis over green catalyst: The effect of thermal treatment of CaO/Zeolite precursor on catalytic activity",
pages = "101-101",
url = "https://hdl.handle.net/21.15107/rcub_cer_3748"
}
Paunović, A., Pavlović, S., Marinković, D.,& Mojović, L.. (2019). Biodiesel synthesis over green catalyst: The effect of thermal treatment of CaO/Zeolite precursor on catalytic activity. in Book of abstracts - Seventh Conference of the Young Chemists of Serbia
Belgrade : Serbian Chemical Society., 101-101.
https://hdl.handle.net/21.15107/rcub_cer_3748
Paunović A, Pavlović S, Marinković D, Mojović L. Biodiesel synthesis over green catalyst: The effect of thermal treatment of CaO/Zeolite precursor on catalytic activity. in Book of abstracts - Seventh Conference of the Young Chemists of Serbia. 2019;:101-101.
https://hdl.handle.net/21.15107/rcub_cer_3748 .
Paunović, Anđela, Pavlović, Stefan, Marinković, Dalibor, Mojović, Ljiljana, "Biodiesel synthesis over green catalyst: The effect of thermal treatment of CaO/Zeolite precursor on catalytic activity" in Book of abstracts - Seventh Conference of the Young Chemists of Serbia (2019):101-101,
https://hdl.handle.net/21.15107/rcub_cer_3748 .

Biodiesel synthesis over green catalyst: The effect of thermal treatment of CaO/Zeolite precursor on catalytic activity

Paunović, Anđela; Pavlović, Stefan; Marinković, Dalibor; Mojović, Ljiljana

(2019)

TY  - CONF
AU  - Paunović, Anđela
AU  - Pavlović, Stefan
AU  - Marinković, Dalibor
AU  - Mojović, Ljiljana
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3778
AB  - Poster presented at Seventh Conference of the Young Chemists of Serbia, 2nd November 2019
T1  - Biodiesel synthesis over green catalyst: The effect of thermal treatment of CaO/Zeolite precursor on catalytic activity
UR  - https://hdl.handle.net/21.15107/rcub_cer_3778
ER  - 
@conference{
author = "Paunović, Anđela and Pavlović, Stefan and Marinković, Dalibor and Mojović, Ljiljana",
year = "2019",
abstract = "Poster presented at Seventh Conference of the Young Chemists of Serbia, 2nd November 2019",
title = "Biodiesel synthesis over green catalyst: The effect of thermal treatment of CaO/Zeolite precursor on catalytic activity",
url = "https://hdl.handle.net/21.15107/rcub_cer_3778"
}
Paunović, A., Pavlović, S., Marinković, D.,& Mojović, L.. (2019). Biodiesel synthesis over green catalyst: The effect of thermal treatment of CaO/Zeolite precursor on catalytic activity. .
https://hdl.handle.net/21.15107/rcub_cer_3778
Paunović A, Pavlović S, Marinković D, Mojović L. Biodiesel synthesis over green catalyst: The effect of thermal treatment of CaO/Zeolite precursor on catalytic activity. 2019;.
https://hdl.handle.net/21.15107/rcub_cer_3778 .
Paunović, Anđela, Pavlović, Stefan, Marinković, Dalibor, Mojović, Ljiljana, "Biodiesel synthesis over green catalyst: The effect of thermal treatment of CaO/Zeolite precursor on catalytic activity" (2019),
https://hdl.handle.net/21.15107/rcub_cer_3778 .

Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst

Marinković, Dalibor; Miladinović, Marija R.; Avramović, Jelena M.; Krstić, Ivan; Stanković, Miroslav; Stamenković, Olivera; Jovanović, Dušan M.; Veljković, Vlada B.

(Oxford : Pergamon-Elsevier Science Ltd, 2018)

TY  - JOUR
AU  - Marinković, Dalibor
AU  - Miladinović, Marija R.
AU  - Avramović, Jelena M.
AU  - Krstić, Ivan
AU  - Stanković, Miroslav
AU  - Stamenković, Olivera
AU  - Jovanović, Dušan M.
AU  - Veljković, Vlada B.
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2301
AB  - Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 particles were conducted in batch stirred and packed-bed tubular reactors at 60 degrees C. The proposed three-parameter kinetic model describing the overall reaction with a variable mechanism was successfully applied to both batch and continuous reactions. The process optimization was done using the response surface methodology combined with a central composite design. The obtained optimal catalyst concentration, methanol-to-oil molar ratio and reaction time for the batch reaction were 0.55% (CaO to the oil), 9:1 and 5.22 h, respectively. In the continuous process, the catalyst was highly active stable and slightly leachable during 30 h. The deactivation of the catalyst was due to massive deposition of the organic molecules from the reaction mixture, which sheltered the catalytically active sites on the catalyst surface.
PB  - Oxford : Pergamon-Elsevier Science Ltd
T2  - Energy Conversion and Management
T1  - Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst
VL  - 163
SP  - 122
EP  - 133
DO  - 10.1016/j.enconman.2018.02.048
ER  - 
@article{
author = "Marinković, Dalibor and Miladinović, Marija R. and Avramović, Jelena M. and Krstić, Ivan and Stanković, Miroslav and Stamenković, Olivera and Jovanović, Dušan M. and Veljković, Vlada B.",
year = "2018",
abstract = "Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 particles were conducted in batch stirred and packed-bed tubular reactors at 60 degrees C. The proposed three-parameter kinetic model describing the overall reaction with a variable mechanism was successfully applied to both batch and continuous reactions. The process optimization was done using the response surface methodology combined with a central composite design. The obtained optimal catalyst concentration, methanol-to-oil molar ratio and reaction time for the batch reaction were 0.55% (CaO to the oil), 9:1 and 5.22 h, respectively. In the continuous process, the catalyst was highly active stable and slightly leachable during 30 h. The deactivation of the catalyst was due to massive deposition of the organic molecules from the reaction mixture, which sheltered the catalytically active sites on the catalyst surface.",
publisher = "Oxford : Pergamon-Elsevier Science Ltd",
journal = "Energy Conversion and Management",
title = "Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst",
volume = "163",
pages = "122-133",
doi = "10.1016/j.enconman.2018.02.048"
}
Marinković, D., Miladinović, M. R., Avramović, J. M., Krstić, I., Stanković, M., Stamenković, O., Jovanović, D. M.,& Veljković, V. B.. (2018). Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst. in Energy Conversion and Management
Oxford : Pergamon-Elsevier Science Ltd., 163, 122-133.
https://doi.org/10.1016/j.enconman.2018.02.048
Marinković D, Miladinović MR, Avramović JM, Krstić I, Stanković M, Stamenković O, Jovanović DM, Veljković VB. Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst. in Energy Conversion and Management. 2018;163:122-133.
doi:10.1016/j.enconman.2018.02.048 .
Marinković, Dalibor, Miladinović, Marija R., Avramović, Jelena M., Krstić, Ivan, Stanković, Miroslav, Stamenković, Olivera, Jovanović, Dušan M., Veljković, Vlada B., "Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst" in Energy Conversion and Management, 163 (2018):122-133,
https://doi.org/10.1016/j.enconman.2018.02.048 . .
21
14
21

Supplementary material for: "Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst"

Marinković, Dalibor; Miladinović, Marija R.; Avramović, Jelena M.; Krstić, Ivan; Stanković, Miroslav; Stamenković, Olivera; Jovanović, Dušan M.; Veljković, Vlada B.

(Elsevier, 2018)

TY  - DATA
AU  - Marinković, Dalibor
AU  - Miladinović, Marija R.
AU  - Avramović, Jelena M.
AU  - Krstić, Ivan
AU  - Stanković, Miroslav
AU  - Stamenković, Olivera
AU  - Jovanović, Dušan M.
AU  - Veljković, Vlada B.
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4490
AB  - Supplementary material for: Marinković, D., Miladinovic, M. R., Avramović, J. M., Krstic, I. B., Stanković, M., Stamenković, O., Jovanović, D. M.,& Veljković, V. B. (2018). Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst. Energy Conversion and Management, 163, 122-133. https://doi.org/10.1016/j.enconman.2018.02.048
PB  - Elsevier
T2  - Energy Conversion and Management
T1  - Supplementary material for: "Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst"
UR  - https://hdl.handle.net/21.15107/rcub_cer_4490
ER  - 
@misc{
author = "Marinković, Dalibor and Miladinović, Marija R. and Avramović, Jelena M. and Krstić, Ivan and Stanković, Miroslav and Stamenković, Olivera and Jovanović, Dušan M. and Veljković, Vlada B.",
year = "2018",
abstract = "Supplementary material for: Marinković, D., Miladinovic, M. R., Avramović, J. M., Krstic, I. B., Stanković, M., Stamenković, O., Jovanović, D. M.,& Veljković, V. B. (2018). Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst. Energy Conversion and Management, 163, 122-133. https://doi.org/10.1016/j.enconman.2018.02.048",
publisher = "Elsevier",
journal = "Energy Conversion and Management",
title = "Supplementary material for: "Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst"",
url = "https://hdl.handle.net/21.15107/rcub_cer_4490"
}
Marinković, D., Miladinović, M. R., Avramović, J. M., Krstić, I., Stanković, M., Stamenković, O., Jovanović, D. M.,& Veljković, V. B.. (2018). Supplementary material for: "Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst". in Energy Conversion and Management
Elsevier..
https://hdl.handle.net/21.15107/rcub_cer_4490
Marinković D, Miladinović MR, Avramović JM, Krstić I, Stanković M, Stamenković O, Jovanović DM, Veljković VB. Supplementary material for: "Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst". in Energy Conversion and Management. 2018;.
https://hdl.handle.net/21.15107/rcub_cer_4490 .
Marinković, Dalibor, Miladinović, Marija R., Avramović, Jelena M., Krstić, Ivan, Stanković, Miroslav, Stamenković, Olivera, Jovanović, Dušan M., Veljković, Vlada B., "Supplementary material for: "Kinetic modeling and optimization of sunflower oil methanolysis catalyzed by spherically-shaped CaO/gamma-Al2O3 catalyst"" in Energy Conversion and Management (2018),
https://hdl.handle.net/21.15107/rcub_cer_4490 .

Synthesis and characterization of mixed oxides derivate from Li modified Mg-Al hydrotalcites

Marinković, Dalibor; Gabrovska, Margarita; Nikolova, Dimitrinka; Pavlović, Stefan; Milovanović, B.; Stanković, Miroslav

(Society of Physical Chemists of Serbia, 2018)

TY  - CONF
AU  - Marinković, Dalibor
AU  - Gabrovska, Margarita
AU  - Nikolova, Dimitrinka
AU  - Pavlović, Stefan
AU  - Milovanović, B.
AU  - Stanković, Miroslav
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2890
AB  - Lithium modified Mg/Al hydrotalcite-like samples with different Li content
were synthesized using co-precipitation followed by calcination at 500 °C.
The samples were characterized by means of XRD, DRIFTS, SEM-EDS,
LDPSA and MIP. Results from this study indicated that the addition of Li
modifier influences the change in structural, textural and morphological
characteristics, more pronounced in samples with higher lithium content.
PB  - Society of Physical Chemists of Serbia
PB  - Društvo fizikohemičara Srbije
C3  - Physical Chemistry 2018 – 14th International Conference on Fundamental and Applied Aspects of Physical Chemistry
T1  - Synthesis and characterization of mixed oxides derivate from Li modified Mg-Al hydrotalcites
VL  - 2
SP  - 657
EP  - 660
UR  - https://hdl.handle.net/21.15107/rcub_cer_2890
ER  - 
@conference{
author = "Marinković, Dalibor and Gabrovska, Margarita and Nikolova, Dimitrinka and Pavlović, Stefan and Milovanović, B. and Stanković, Miroslav",
year = "2018",
abstract = "Lithium modified Mg/Al hydrotalcite-like samples with different Li content
were synthesized using co-precipitation followed by calcination at 500 °C.
The samples were characterized by means of XRD, DRIFTS, SEM-EDS,
LDPSA and MIP. Results from this study indicated that the addition of Li
modifier influences the change in structural, textural and morphological
characteristics, more pronounced in samples with higher lithium content.",
publisher = "Society of Physical Chemists of Serbia, Društvo fizikohemičara Srbije",
journal = "Physical Chemistry 2018 – 14th International Conference on Fundamental and Applied Aspects of Physical Chemistry",
title = "Synthesis and characterization of mixed oxides derivate from Li modified Mg-Al hydrotalcites",
volume = "2",
pages = "657-660",
url = "https://hdl.handle.net/21.15107/rcub_cer_2890"
}
Marinković, D., Gabrovska, M., Nikolova, D., Pavlović, S., Milovanović, B.,& Stanković, M.. (2018). Synthesis and characterization of mixed oxides derivate from Li modified Mg-Al hydrotalcites. in Physical Chemistry 2018 – 14th International Conference on Fundamental and Applied Aspects of Physical Chemistry
Society of Physical Chemists of Serbia., 2, 657-660.
https://hdl.handle.net/21.15107/rcub_cer_2890
Marinković D, Gabrovska M, Nikolova D, Pavlović S, Milovanović B, Stanković M. Synthesis and characterization of mixed oxides derivate from Li modified Mg-Al hydrotalcites. in Physical Chemistry 2018 – 14th International Conference on Fundamental and Applied Aspects of Physical Chemistry. 2018;2:657-660.
https://hdl.handle.net/21.15107/rcub_cer_2890 .
Marinković, Dalibor, Gabrovska, Margarita, Nikolova, Dimitrinka, Pavlović, Stefan, Milovanović, B., Stanković, Miroslav, "Synthesis and characterization of mixed oxides derivate from Li modified Mg-Al hydrotalcites" in Physical Chemistry 2018 – 14th International Conference on Fundamental and Applied Aspects of Physical Chemistry, 2 (2018):657-660,
https://hdl.handle.net/21.15107/rcub_cer_2890 .

Preparation of zeolite from coal fly ash as waste raw material

Pavlović, Stefan; Marinković, Dalibor; Stanković, Miroslav; Milovanović, Biljana

(Serbian Chemical Society, 2018)

TY  - CONF
AU  - Pavlović, Stefan
AU  - Marinković, Dalibor
AU  - Stanković, Miroslav
AU  - Milovanović, Biljana
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2891
AB  - The zeolite from F class coal fly ash (FA) was prepared from alkali fused fly ash
followed by hydrothermal treatment. Sodium water glass obtained from the calcined and
acid activated FA and sodium aluminate were used in zeolitization. Hydrothermal
reaction was performed at 90°C for 4h. The prepared zeolitic material was characterized
by EDX, XRD, FT-IR and Hg-porosimetry. The concentrations of the main components
SiO2, Al2O3, and Na2O in the synthesized material are: 51.45%, 30.01%, and 16.64%,
respectively. The diffraction patterns show that the characteristics lines are at 14.4°,
20.5°, 25.5°, 32.7°, 39°, and 44.5° that are typical for Na-X zeolite. The FT-IR spectra
show that the strongest vibration is at 960 cm-1 (T-O stretch), whereas the vibrations in
the region between 600 and 750 cm-1 are related to tetrahedral atoms in zeolite structure
[1, 2]. The Hg porsimetry measurements show that the porosity of obtained material is
around 62% and the total pore volume is 1,10 cm3/g. Such characteristics of the prepared
zeolitic material allow its use in various catalytic chemical processes for converting
vegetable oil to biofuel including transesterification, deoxygenation, thermal cracking,
catalytic cracking, and hydroprocessing.
PB  - Serbian Chemical Society
C3  - Sixt Conference of the Young Chemists of Serbia
T1  - Preparation of zeolite from coal fly ash as waste raw material
SP  - 99
UR  - https://hdl.handle.net/21.15107/rcub_cer_2891
ER  - 
@conference{
author = "Pavlović, Stefan and Marinković, Dalibor and Stanković, Miroslav and Milovanović, Biljana",
year = "2018",
abstract = "The zeolite from F class coal fly ash (FA) was prepared from alkali fused fly ash
followed by hydrothermal treatment. Sodium water glass obtained from the calcined and
acid activated FA and sodium aluminate were used in zeolitization. Hydrothermal
reaction was performed at 90°C for 4h. The prepared zeolitic material was characterized
by EDX, XRD, FT-IR and Hg-porosimetry. The concentrations of the main components
SiO2, Al2O3, and Na2O in the synthesized material are: 51.45%, 30.01%, and 16.64%,
respectively. The diffraction patterns show that the characteristics lines are at 14.4°,
20.5°, 25.5°, 32.7°, 39°, and 44.5° that are typical for Na-X zeolite. The FT-IR spectra
show that the strongest vibration is at 960 cm-1 (T-O stretch), whereas the vibrations in
the region between 600 and 750 cm-1 are related to tetrahedral atoms in zeolite structure
[1, 2]. The Hg porsimetry measurements show that the porosity of obtained material is
around 62% and the total pore volume is 1,10 cm3/g. Such characteristics of the prepared
zeolitic material allow its use in various catalytic chemical processes for converting
vegetable oil to biofuel including transesterification, deoxygenation, thermal cracking,
catalytic cracking, and hydroprocessing.",
publisher = "Serbian Chemical Society",
journal = "Sixt Conference of the Young Chemists of Serbia",
title = "Preparation of zeolite from coal fly ash as waste raw material",
pages = "99",
url = "https://hdl.handle.net/21.15107/rcub_cer_2891"
}
Pavlović, S., Marinković, D., Stanković, M.,& Milovanović, B.. (2018). Preparation of zeolite from coal fly ash as waste raw material. in Sixt Conference of the Young Chemists of Serbia
Serbian Chemical Society., 99.
https://hdl.handle.net/21.15107/rcub_cer_2891
Pavlović S, Marinković D, Stanković M, Milovanović B. Preparation of zeolite from coal fly ash as waste raw material. in Sixt Conference of the Young Chemists of Serbia. 2018;:99.
https://hdl.handle.net/21.15107/rcub_cer_2891 .
Pavlović, Stefan, Marinković, Dalibor, Stanković, Miroslav, Milovanović, Biljana, "Preparation of zeolite from coal fly ash as waste raw material" in Sixt Conference of the Young Chemists of Serbia (2018):99,
https://hdl.handle.net/21.15107/rcub_cer_2891 .