TY  - JOUR
AU  - Brzić, Danica
AU  - Pešić, Radojica
AU  - Arsenijević, Zorana
AU  - Đuriš, Mihal
AU  - Bošković-Vragolović, Nevenka
AU  - Kaluđerović-Radoičić, Tatjana
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5247
AB  - The present work concerns an experimental study on heat transfer in gas-solid fluidized bed of coarse (Geldart D) particles to a larger immersed sphere at high superficial velocities from 2 to 5.5 Umf. The heat transfer coefficient was determined by measuring the temperature of the test sphere during its heating in a fluidized bed in the temperature range of 65–175 °C. The test spheres of different sizes and different materials were utilized. For the given gas-particles system the flow regime changes from rapidly growing bubbles to turbulent fluidization at superficial velocity Uc ≈ 3Umf. It has been found that in rapidly growing bubbles regime, the heat transfer coefficient is higher for smaller test spheres while it is almost independent of the superficial gas velocity. In turbulent regime, the heat transfer coefficient increases with increase of gas velocity while the size of the test sphere exhibits less influence. In the rapidly growing bubbles regime, experimental data for heat transfer coefficient can be predicted adequately with correlation of Scott et al.. For the turbulent flow regime a new correlation for prediction of the heat transfer coefficient has been proposed.
PB  - Taylor & Francis
T2  - Particulate Science and Technology
T1  - Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime
VL  - 41
IS  - 1
SP  - 75
EP  - 83
DO  - 10.1080/02726351.2022.2053015
ER  - 

@article{
author = "Brzić, Danica and Pešić, Radojica and Arsenijević, Zorana and Đuriš, Mihal and Bošković-Vragolović, Nevenka and Kaluđerović-Radoičić, Tatjana",
year = "2023",
abstract = "The present work concerns an experimental study on heat transfer in gas-solid fluidized bed of coarse (Geldart D) particles to a larger immersed sphere at high superficial velocities from 2 to 5.5 Umf. The heat transfer coefficient was determined by measuring the temperature of the test sphere during its heating in a fluidized bed in the temperature range of 65–175 °C. The test spheres of different sizes and different materials were utilized. For the given gas-particles system the flow regime changes from rapidly growing bubbles to turbulent fluidization at superficial velocity Uc ≈ 3Umf. It has been found that in rapidly growing bubbles regime, the heat transfer coefficient is higher for smaller test spheres while it is almost independent of the superficial gas velocity. In turbulent regime, the heat transfer coefficient increases with increase of gas velocity while the size of the test sphere exhibits less influence. In the rapidly growing bubbles regime, experimental data for heat transfer coefficient can be predicted adequately with correlation of Scott et al.. For the turbulent flow regime a new correlation for prediction of the heat transfer coefficient has been proposed.",
publisher = "Taylor & Francis",
journal = "Particulate Science and Technology",
title = "Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime",
volume = "41",
number = "1",
pages = "75-83",
doi = "10.1080/02726351.2022.2053015"
}

Brzić, D., Pešić, R., Arsenijević, Z., Đuriš, M., Bošković-Vragolović, N.,& Kaluđerović-Radoičić, T.. (2023). Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime. in Particulate Science and Technology
Taylor & Francis., 41(1), 75-83.
https://doi.org/10.1080/02726351.2022.2053015

Brzić D, Pešić R, Arsenijević Z, Đuriš M, Bošković-Vragolović N, Kaluđerović-Radoičić T. Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime. in Particulate Science and Technology. 2023;41(1):75-83.
doi:10.1080/02726351.2022.2053015 .

Brzić, Danica, Pešić, Radojica, Arsenijević, Zorana, Đuriš, Mihal, Bošković-Vragolović, Nevenka, Kaluđerović-Radoičić, Tatjana, "Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime" in Particulate Science and Technology, 41, no. 1 (2023):75-83,
https://doi.org/10.1080/02726351.2022.2053015 . .

TY  - CHAP
AU  - Hadnadjev-Kostić, Milica
AU  - Vulic, Tatjana
AU  - Dostanić, Jasmina
AU  - Lončarević, Davor
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3752
AB  - The chapter aims to provide a general overview of current thinking and research results regarding the development of visible light responsive metal oxide–based catalysts with enhanced photocatalytic activities, especially outlining their chemical and physical properties, as well as the critical importance of photocatalyst preparation procedure. This chapter will summarize published research literature and their key interpretations, concerning complex interactions that occur during the photocatalyst preparation taking into consideration synthesis methodology, composition, as well as functional properties. Additionally, numerous applications of metal oxide photocatalysts are discussed, especially emphasizing wastewater treatment and clean energy production, highlighting the correlation between their efficiency and recent modifications applied to metal oxides.
PB  - Elsevier
T2  - Handbook of Smart Photocatalytic Materials - Fundamentals, Fabrications, and Water Resources Applications
T1  - Design and application of various visible light responsive metal oxide photocatalysts
SP  - 65
EP  - 99
DO  - 10.1016/B978-0-12-819051-7.00003-8
ER  - 

@inbook{
author = "Hadnadjev-Kostić, Milica and Vulic, Tatjana and Dostanić, Jasmina and Lončarević, Davor",
year = "2020",
abstract = "The chapter aims to provide a general overview of current thinking and research results regarding the development of visible light responsive metal oxide–based catalysts with enhanced photocatalytic activities, especially outlining their chemical and physical properties, as well as the critical importance of photocatalyst preparation procedure. This chapter will summarize published research literature and their key interpretations, concerning complex interactions that occur during the photocatalyst preparation taking into consideration synthesis methodology, composition, as well as functional properties. Additionally, numerous applications of metal oxide photocatalysts are discussed, especially emphasizing wastewater treatment and clean energy production, highlighting the correlation between their efficiency and recent modifications applied to metal oxides.",
publisher = "Elsevier",
journal = "Handbook of Smart Photocatalytic Materials - Fundamentals, Fabrications, and Water Resources Applications",
booktitle = "Design and application of various visible light responsive metal oxide photocatalysts",
pages = "65-99",
doi = "10.1016/B978-0-12-819051-7.00003-8"
}

Hadnadjev-Kostić, M., Vulic, T., Dostanić, J.,& Lončarević, D.. (2020). Design and application of various visible light responsive metal oxide photocatalysts. in Handbook of Smart Photocatalytic Materials - Fundamentals, Fabrications, and Water Resources Applications
Elsevier., 65-99.
https://doi.org/10.1016/B978-0-12-819051-7.00003-8

Hadnadjev-Kostić M, Vulic T, Dostanić J, Lončarević D. Design and application of various visible light responsive metal oxide photocatalysts. in Handbook of Smart Photocatalytic Materials - Fundamentals, Fabrications, and Water Resources Applications. 2020;:65-99.
doi:10.1016/B978-0-12-819051-7.00003-8 .

Hadnadjev-Kostić, Milica, Vulic, Tatjana, Dostanić, Jasmina, Lončarević, Davor, "Design and application of various visible light responsive metal oxide photocatalysts" in Handbook of Smart Photocatalytic Materials - Fundamentals, Fabrications, and Water Resources Applications (2020):65-99,
https://doi.org/10.1016/B978-0-12-819051-7.00003-8 . .

TY  - JOUR
AU  - Đuriš, Mihal
AU  - Arsenijević, Zorana
AU  - Kaluđerović-Radoičić, Tatjana
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2399
AB  - Fluidization experiments were performed by using spherical and non-spherical particles to examine the sensitivity of the variational model to three input parameters: Umf, εmf and Ut. Several correlations for Umf, εmf and Ut were tested and the results were compared with the experimental values. The variational model’s ability to predict the bed expansion (in the form of U=f(ε)) and the interphase drag coefficient was investigated by varying the three input variables by ±20% compared with their experimental values. The variational model for the bed expansion showed the greatest sensitivity to changes in the εmf values. The overestimated values of εmf resulted in underestimating U(ε), and likewise, the underestimated values of εmf resulted in overestimating U(ε). The variational model’s sensitivity to changes in the Umf values is also important. Contrary to εmf, overestimating the values of Umf resulted in overestimating U(ε). The model’s least sensitivity was to the Ut value variation, which, if varied by ±20% compared with their experimental values, had a negligible effect on the prediction quality. This study aims to examine the sensitivity of the variational model to Umf, Ut and εmf values obtained from various correlations, in the absence of experimental values.
PB  - Taylor and Francis Inc.
T2  - Particulate Science and Technology
T1  - Sensitivity analysis of the variational model for the particulate expansion of fluidized beds
VL  - 38
IS  - 1
SP  - 95
EP  - 104
DO  - 10.1080/02726351.2018.1508100
ER  - 

@article{
author = "Đuriš, Mihal and Arsenijević, Zorana and Kaluđerović-Radoičić, Tatjana",
year = "2020",
abstract = "Fluidization experiments were performed by using spherical and non-spherical particles to examine the sensitivity of the variational model to three input parameters: Umf, εmf and Ut. Several correlations for Umf, εmf and Ut were tested and the results were compared with the experimental values. The variational model’s ability to predict the bed expansion (in the form of U=f(ε)) and the interphase drag coefficient was investigated by varying the three input variables by ±20% compared with their experimental values. The variational model for the bed expansion showed the greatest sensitivity to changes in the εmf values. The overestimated values of εmf resulted in underestimating U(ε), and likewise, the underestimated values of εmf resulted in overestimating U(ε). The variational model’s sensitivity to changes in the Umf values is also important. Contrary to εmf, overestimating the values of Umf resulted in overestimating U(ε). The model’s least sensitivity was to the Ut value variation, which, if varied by ±20% compared with their experimental values, had a negligible effect on the prediction quality. This study aims to examine the sensitivity of the variational model to Umf, Ut and εmf values obtained from various correlations, in the absence of experimental values.",
publisher = "Taylor and Francis Inc.",
journal = "Particulate Science and Technology",
title = "Sensitivity analysis of the variational model for the particulate expansion of fluidized beds",
volume = "38",
number = "1",
pages = "95-104",
doi = "10.1080/02726351.2018.1508100"
}

Đuriš, M., Arsenijević, Z.,& Kaluđerović-Radoičić, T.. (2020). Sensitivity analysis of the variational model for the particulate expansion of fluidized beds. in Particulate Science and Technology
Taylor and Francis Inc.., 38(1), 95-104.
https://doi.org/10.1080/02726351.2018.1508100

Đuriš M, Arsenijević Z, Kaluđerović-Radoičić T. Sensitivity analysis of the variational model for the particulate expansion of fluidized beds. in Particulate Science and Technology. 2020;38(1):95-104.
doi:10.1080/02726351.2018.1508100 .

Đuriš, Mihal, Arsenijević, Zorana, Kaluđerović-Radoičić, Tatjana, "Sensitivity analysis of the variational model for the particulate expansion of fluidized beds" in Particulate Science and Technology, 38, no. 1 (2020):95-104,
https://doi.org/10.1080/02726351.2018.1508100 . .

TY  - JOUR
AU  - Đuriš, Mihal
AU  - Arsenijević, Zorana
AU  - Garić Grulović, Radmila
AU  - Kaluđerović-Radoičić, Tatjana
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3598
AB  - In this study, we applied the variational model to fluidization of small spherical particles. Fluidizationexperiments were carried out for spherical particles with 13 diameters between dp= 0.13 and 5.00 mm.We propose a generalized form of our variational model to predict the superficial velocity U and inter-phase drag coefficient ˇ by introducing an exponent n to describe the different dependences of the dragforce Fdon fluid velocity for different particle sizes (different flow regimes). By comparing the predictionswith the experimental results, we conclude that n=1 should be used for small particles (dp< 1 mm) andn = 2 for larger particles (dp> 1 mm). This conclusion is generalized by proposing n = 1 for particles withRet< 160 and n = 2 for particles with Ret> 160. The average mean absolute error was 5.49% in calculatingsuperficial velocity for different bed voidages using the modified variational model for all of the particlesexamined. The calculated values of ˇ were compared with values of literature models for particles withdp< 1.0 mm. The average mean absolute error of the modified variational model was 8.02% in calculatingˇ for different bed voidages for all of the particles examined.
PB  - Elsevier
T2  - Particuology
T1  - Prediction of interphase drag coefficient and bed expansion using a variational model for fluidization of small spherical particles
VL  - 51
SP  - 184
EP  - 192
DO  - 10.1016/j.partic.2019.11.002
ER  - 

@article{
author = "Đuriš, Mihal and Arsenijević, Zorana and Garić Grulović, Radmila and Kaluđerović-Radoičić, Tatjana",
year = "2020",
abstract = "In this study, we applied the variational model to fluidization of small spherical particles. Fluidizationexperiments were carried out for spherical particles with 13 diameters between dp= 0.13 and 5.00 mm.We propose a generalized form of our variational model to predict the superficial velocity U and inter-phase drag coefficient ˇ by introducing an exponent n to describe the different dependences of the dragforce Fdon fluid velocity for different particle sizes (different flow regimes). By comparing the predictionswith the experimental results, we conclude that n=1 should be used for small particles (dp< 1 mm) andn = 2 for larger particles (dp> 1 mm). This conclusion is generalized by proposing n = 1 for particles withRet< 160 and n = 2 for particles with Ret> 160. The average mean absolute error was 5.49% in calculatingsuperficial velocity for different bed voidages using the modified variational model for all of the particlesexamined. The calculated values of ˇ were compared with values of literature models for particles withdp< 1.0 mm. The average mean absolute error of the modified variational model was 8.02% in calculatingˇ for different bed voidages for all of the particles examined.",
publisher = "Elsevier",
journal = "Particuology",
title = "Prediction of interphase drag coefficient and bed expansion using a variational model for fluidization of small spherical particles",
volume = "51",
pages = "184-192",
doi = "10.1016/j.partic.2019.11.002"
}

Đuriš, M., Arsenijević, Z., Garić Grulović, R.,& Kaluđerović-Radoičić, T.. (2020). Prediction of interphase drag coefficient and bed expansion using a variational model for fluidization of small spherical particles. in Particuology
Elsevier., 51, 184-192.
https://doi.org/10.1016/j.partic.2019.11.002

Đuriš M, Arsenijević Z, Garić Grulović R, Kaluđerović-Radoičić T. Prediction of interphase drag coefficient and bed expansion using a variational model for fluidization of small spherical particles. in Particuology. 2020;51:184-192.
doi:10.1016/j.partic.2019.11.002 .

Đuriš, Mihal, Arsenijević, Zorana, Garić Grulović, Radmila, Kaluđerović-Radoičić, Tatjana, "Prediction of interphase drag coefficient and bed expansion using a variational model for fluidization of small spherical particles" in Particuology, 51 (2020):184-192,
https://doi.org/10.1016/j.partic.2019.11.002 . .

TY  - CONF
AU  - Felischak, Matthias
AU  - Nikolić, Daliborka
AU  - Petkovska, Menka
AU  - Hamel, Christof
AU  - Seidel-Morgenstern, Andreas
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3842
AB  - The classical design of continuous chemical reactors exploits steady-state operation, which is optimized and maintained by appropriate control systems. Nevertheless, it is well-known that the reactor performance can be enhanced by applying periodic regimes, like forced modulations of input parameters.The identification and evaluation of suitable periodic operation conditions is
challenging. One approach that can be used is based on nonlinear frequency response (NFR) analysis. The focus of this work is the experimental analysis of shapes for two simultaneously imposed modulations (sinusoidal and square) in comparison to results predicted by the NFR method. The acetic anhydride hydrolysis was studied in an adiabatic CSTR exploiting a periodic operation mode, which was found to be superior to the corresponding steady-state operation.
C3  - German reaction Engineering Meeting (DECHEMA), Wuerzburg, Germany
T1  - Forced Periodic Operation: Effect of shapes for two simultaneously imposed modulations
UR  - https://hdl.handle.net/21.15107/rcub_cer_3842
ER  - 

@conference{
author = "Felischak, Matthias and Nikolić, Daliborka and Petkovska, Menka and Hamel, Christof and Seidel-Morgenstern, Andreas",
year = "2019",
abstract = "The classical design of continuous chemical reactors exploits steady-state operation, which is optimized and maintained by appropriate control systems. Nevertheless, it is well-known that the reactor performance can be enhanced by applying periodic regimes, like forced modulations of input parameters.The identification and evaluation of suitable periodic operation conditions is
challenging. One approach that can be used is based on nonlinear frequency response (NFR) analysis. The focus of this work is the experimental analysis of shapes for two simultaneously imposed modulations (sinusoidal and square) in comparison to results predicted by the NFR method. The acetic anhydride hydrolysis was studied in an adiabatic CSTR exploiting a periodic operation mode, which was found to be superior to the corresponding steady-state operation.",
journal = "German reaction Engineering Meeting (DECHEMA), Wuerzburg, Germany",
title = "Forced Periodic Operation: Effect of shapes for two simultaneously imposed modulations",
url = "https://hdl.handle.net/21.15107/rcub_cer_3842"
}

Felischak, M., Nikolić, D., Petkovska, M., Hamel, C.,& Seidel-Morgenstern, A.. (2019). Forced Periodic Operation: Effect of shapes for two simultaneously imposed modulations. in German reaction Engineering Meeting (DECHEMA), Wuerzburg, Germany.
https://hdl.handle.net/21.15107/rcub_cer_3842

Felischak M, Nikolić D, Petkovska M, Hamel C, Seidel-Morgenstern A. Forced Periodic Operation: Effect of shapes for two simultaneously imposed modulations. in German reaction Engineering Meeting (DECHEMA), Wuerzburg, Germany. 2019;.
https://hdl.handle.net/21.15107/rcub_cer_3842 .

Felischak, Matthias, Nikolić, Daliborka, Petkovska, Menka, Hamel, Christof, Seidel-Morgenstern, Andreas, "Forced Periodic Operation: Effect of shapes for two simultaneously imposed modulations" in German reaction Engineering Meeting (DECHEMA), Wuerzburg, Germany (2019),
https://hdl.handle.net/21.15107/rcub_cer_3842 .

TY  - CONF
AU  - Kovačina, Jovanka
AU  - Milošević, Milena D.
AU  - Božić, Aleksandra
AU  - Jovanović, Aleksandar
AU  - Marinković, Aleksandar D.
AU  - Onjia, Antonije E.
AU  - Povrenović, Dragan
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3939
AB  - Usled razvoja industrije i rastom populacije tokom poslednjih godina javljaju se
problemi u vezi sa otpadnim vodama iz proizvodnje koje je neophodno rešavati na ekološki i
ekonomičan način. Sve otpadne vode iz postrojenja bez obzira kako su nastale sadrže štetne
materije koje mogu da imaju i određen stepen toksičnih primesa, moraju se prečistiti ako njihov
kvalitet ne odgovara zakonskim okvirima. Svrha tretmana otpadnih voda je uklanjanje štetnih
materija čime se postiže smanjnje stepena njene zagađenosti, a istovremeno se ostvaruje i određen
ekonomski i ekološki efekat, stoga je u ovom radu izvršeno prečišćavanje otpadne vode postupkom
taloženja upotrebom kalcijum-oksida u cilju uklanjanja koloidnih materija i teških metala. Većina
zagađujućih materija su organskog porekla i njihovo ukljanjanje vršiće se primenom naprednih
oksidacionih procesa korišćenjem ozona i ozona u kombinaciji sa ultrazvukom u cilju postizanja
kvaliteta vode koji odgovara zakonskoj regulativi. Proces prečišćavanja će se optimizovati u
odnosu na tehnološki postupak, koncentraciju, vreme tretmana i količinu primenjenog oksidacionog
sredstva. Stepen zagađenosti vode organskim jedinjenjima će se određivati na osnovu merenja
HPK, BPK i koncentracije teških metala (olovo, gvožđe, hrom, bakar, cink, aluminijum).
AB  - Due to the development of industry and population growth during the in recent years, there are problems with wastewater from production that needs to be addressed in an environmentally and economical way. All wastewaters from industry, no matter how they are created, contain harmful substances that may have some degree of toxicity, must be treated if their quality does not meet the legal requirements. The purpose of wastewater treatment is to remove
harmful substances, thereby reducing its pollution level, and at the same time, it also has a certain economic and environmental effect. Therefore, wastewater treatment was carried out in this work by precipitation using calcium oxide to remove colloidal substances and heavy metals. Most pollutants are of organic origin and their removal will be carried in this work out using advanced
oxidation processes using ozone, and ozone in combination with ultrasound to achieve water quality that complies with the law. The purification process will be optimized with respect to, method, time and amount of oxidizing agent applied. The degree of pollution of water by organic compounds will be determined on the basis of measurements of HPK, BOD and the concentration of heavy metals (lead, ferrum, chromium, copper, zinc, aluminum).
PB  - Beograd : Beogradska politehnika
C3  - Zbornik radova - Peti naučno-stručni skup politehnika
T1  - Prečišćavanje otpadnih voda primenom ozonizacije
T1  - Purification of waste water using ozonization
SP  - 142
EP  - 147
UR  - https://hdl.handle.net/21.15107/rcub_cer_3939
ER  - 

@conference{
author = "Kovačina, Jovanka and Milošević, Milena D. and Božić, Aleksandra and Jovanović, Aleksandar and Marinković, Aleksandar D. and Onjia, Antonije E. and Povrenović, Dragan",
year = "2019",
abstract = "Usled razvoja industrije i rastom populacije tokom poslednjih godina javljaju se
problemi u vezi sa otpadnim vodama iz proizvodnje koje je neophodno rešavati na ekološki i
ekonomičan način. Sve otpadne vode iz postrojenja bez obzira kako su nastale sadrže štetne
materije koje mogu da imaju i određen stepen toksičnih primesa, moraju se prečistiti ako njihov
kvalitet ne odgovara zakonskim okvirima. Svrha tretmana otpadnih voda je uklanjanje štetnih
materija čime se postiže smanjnje stepena njene zagađenosti, a istovremeno se ostvaruje i određen
ekonomski i ekološki efekat, stoga je u ovom radu izvršeno prečišćavanje otpadne vode postupkom
taloženja upotrebom kalcijum-oksida u cilju uklanjanja koloidnih materija i teških metala. Većina
zagađujućih materija su organskog porekla i njihovo ukljanjanje vršiće se primenom naprednih
oksidacionih procesa korišćenjem ozona i ozona u kombinaciji sa ultrazvukom u cilju postizanja
kvaliteta vode koji odgovara zakonskoj regulativi. Proces prečišćavanja će se optimizovati u
odnosu na tehnološki postupak, koncentraciju, vreme tretmana i količinu primenjenog oksidacionog
sredstva. Stepen zagađenosti vode organskim jedinjenjima će se određivati na osnovu merenja
HPK, BPK i koncentracije teških metala (olovo, gvožđe, hrom, bakar, cink, aluminijum)., Due to the development of industry and population growth during the in recent years, there are problems with wastewater from production that needs to be addressed in an environmentally and economical way. All wastewaters from industry, no matter how they are created, contain harmful substances that may have some degree of toxicity, must be treated if their quality does not meet the legal requirements. The purpose of wastewater treatment is to remove
harmful substances, thereby reducing its pollution level, and at the same time, it also has a certain economic and environmental effect. Therefore, wastewater treatment was carried out in this work by precipitation using calcium oxide to remove colloidal substances and heavy metals. Most pollutants are of organic origin and their removal will be carried in this work out using advanced
oxidation processes using ozone, and ozone in combination with ultrasound to achieve water quality that complies with the law. The purification process will be optimized with respect to, method, time and amount of oxidizing agent applied. The degree of pollution of water by organic compounds will be determined on the basis of measurements of HPK, BOD and the concentration of heavy metals (lead, ferrum, chromium, copper, zinc, aluminum).",
publisher = "Beograd : Beogradska politehnika",
journal = "Zbornik radova - Peti naučno-stručni skup politehnika",
title = "Prečišćavanje otpadnih voda primenom ozonizacije, Purification of waste water using ozonization",
pages = "142-147",
url = "https://hdl.handle.net/21.15107/rcub_cer_3939"
}

Kovačina, J., Milošević, M. D., Božić, A., Jovanović, A., Marinković, A. D., Onjia, A. E.,& Povrenović, D.. (2019). Prečišćavanje otpadnih voda primenom ozonizacije. in Zbornik radova - Peti naučno-stručni skup politehnika
Beograd : Beogradska politehnika., 142-147.
https://hdl.handle.net/21.15107/rcub_cer_3939

Kovačina J, Milošević MD, Božić A, Jovanović A, Marinković AD, Onjia AE, Povrenović D. Prečišćavanje otpadnih voda primenom ozonizacije. in Zbornik radova - Peti naučno-stručni skup politehnika. 2019;:142-147.
https://hdl.handle.net/21.15107/rcub_cer_3939 .

Kovačina, Jovanka, Milošević, Milena D., Božić, Aleksandra, Jovanović, Aleksandar, Marinković, Aleksandar D., Onjia, Antonije E., Povrenović, Dragan, "Prečišćavanje otpadnih voda primenom ozonizacije" in Zbornik radova - Peti naučno-stručni skup politehnika (2019):142-147,
https://hdl.handle.net/21.15107/rcub_cer_3939 .

TY  - JOUR
AU  - Rožić, Ljiljana
AU  - Petrović, Srđan
AU  - Lončarević, Davor
AU  - Grbić, Boško
AU  - Radić, Nenad
AU  - Stojadinović, Stevan
AU  - Jović, Vesna
AU  - Lamovec, Jelena
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2486
AB  - TiO2-CeO2 nanopowders were synthesised by a ball-milling process and then annealed at temperatures from 500 degrees to 800 degrees C. X-ray diffraction and diffuse reflectance spectra were used in combination with temperature programmed desorption to determine the structural and microstructural changes of nanopowders as a the function of annealing temperature. The results of the X-ray analysis showed that the weight fraction of the cerianite phase remained unchanged with a temperature rise of 600-700 degrees C, indicating that the phase changes occur only within TiO2. The TiO2-CeO2 nanopowder showed enhanced optical properties with a red shift after the thermal treatment. Photocatalytic studies revealed that the sample annealed at 600 degrees C showed higher photocatalytic activity than samples annealed at lower or higher temperatures in the degradation of the methyl orange. The activity test of all samples is in accordance with photoluminescence measurements, proportional to the concentrations of hydroxyl radicals at the photocatalyst surfaces.
PB  - Elsevier Sci Ltd, Oxford
T2  - Ceramics International
T1  - Influence of annealing temperature on structural, optical and photocatalytic properties of TiO2-CeO2 nanopowders
VL  - 45
IS  - 2
SP  - 2361
EP  - 2367
DO  - 10.1016/j.ceramint.2018.10.153
ER  - 

@article{
author = "Rožić, Ljiljana and Petrović, Srđan and Lončarević, Davor and Grbić, Boško and Radić, Nenad and Stojadinović, Stevan and Jović, Vesna and Lamovec, Jelena",
year = "2019",
abstract = "TiO2-CeO2 nanopowders were synthesised by a ball-milling process and then annealed at temperatures from 500 degrees to 800 degrees C. X-ray diffraction and diffuse reflectance spectra were used in combination with temperature programmed desorption to determine the structural and microstructural changes of nanopowders as a the function of annealing temperature. The results of the X-ray analysis showed that the weight fraction of the cerianite phase remained unchanged with a temperature rise of 600-700 degrees C, indicating that the phase changes occur only within TiO2. The TiO2-CeO2 nanopowder showed enhanced optical properties with a red shift after the thermal treatment. Photocatalytic studies revealed that the sample annealed at 600 degrees C showed higher photocatalytic activity than samples annealed at lower or higher temperatures in the degradation of the methyl orange. The activity test of all samples is in accordance with photoluminescence measurements, proportional to the concentrations of hydroxyl radicals at the photocatalyst surfaces.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "Influence of annealing temperature on structural, optical and photocatalytic properties of TiO2-CeO2 nanopowders",
volume = "45",
number = "2",
pages = "2361-2367",
doi = "10.1016/j.ceramint.2018.10.153"
}

Rožić, L., Petrović, S., Lončarević, D., Grbić, B., Radić, N., Stojadinović, S., Jović, V.,& Lamovec, J.. (2019). Influence of annealing temperature on structural, optical and photocatalytic properties of TiO2-CeO2 nanopowders. in Ceramics International
Elsevier Sci Ltd, Oxford., 45(2), 2361-2367.
https://doi.org/10.1016/j.ceramint.2018.10.153

Rožić L, Petrović S, Lončarević D, Grbić B, Radić N, Stojadinović S, Jović V, Lamovec J. Influence of annealing temperature on structural, optical and photocatalytic properties of TiO2-CeO2 nanopowders. in Ceramics International. 2019;45(2):2361-2367.
doi:10.1016/j.ceramint.2018.10.153 .

Rožić, Ljiljana, Petrović, Srđan, Lončarević, Davor, Grbić, Boško, Radić, Nenad, Stojadinović, Stevan, Jović, Vesna, Lamovec, Jelena, "Influence of annealing temperature on structural, optical and photocatalytic properties of TiO2-CeO2 nanopowders" in Ceramics International, 45, no. 2 (2019):2361-2367,
https://doi.org/10.1016/j.ceramint.2018.10.153 . .

TY  - JOUR
AU  - Rožić, Ljiljana
AU  - Petrović, Srđan
AU  - Lončarević, Davor
AU  - Grbić, Boško
AU  - Radić, Nenad
AU  - Stojadinović, Stevan
AU  - Jović, Vesna
AU  - Lamovec, Jelena
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2900
AB  - TiO2-CeO2 nanopowders were synthesised by a ball-milling process and then annealed at temperatures from 500 degrees to 800 degrees C. X-ray diffraction and diffuse reflectance spectra were used in combination with temperature programmed desorption to determine the structural and microstructural changes of nanopowders as a the function of annealing temperature. The results of the X-ray analysis showed that the weight fraction of the cerianite phase remained unchanged with a temperature rise of 600-700 degrees C, indicating that the phase changes occur only within TiO2. The TiO2-CeO2 nanopowder showed enhanced optical properties with a red shift after the thermal treatment. Photocatalytic studies revealed that the sample annealed at 600 degrees C showed higher photocatalytic activity than samples annealed at lower or higher temperatures in the degradation of the methyl orange. The activity test of all samples is in accordance with photoluminescence measurements, proportional to the concentrations of hydroxyl radicals at the photocatalyst surfaces.
PB  - Oxford : Elsevier Sci Ltd.
T2  - Ceramics International
T1  - Influence of annealing temperature on structural, optical and photocatalytic properties of TiO2-CeO2 nanopowders
VL  - 45
IS  - 2
SP  - 2361
EP  - 2367
DO  - 10.1016/j.ceramint.2018.10.153
ER  - 

@article{
author = "Rožić, Ljiljana and Petrović, Srđan and Lončarević, Davor and Grbić, Boško and Radić, Nenad and Stojadinović, Stevan and Jović, Vesna and Lamovec, Jelena",
year = "2019",
abstract = "TiO2-CeO2 nanopowders were synthesised by a ball-milling process and then annealed at temperatures from 500 degrees to 800 degrees C. X-ray diffraction and diffuse reflectance spectra were used in combination with temperature programmed desorption to determine the structural and microstructural changes of nanopowders as a the function of annealing temperature. The results of the X-ray analysis showed that the weight fraction of the cerianite phase remained unchanged with a temperature rise of 600-700 degrees C, indicating that the phase changes occur only within TiO2. The TiO2-CeO2 nanopowder showed enhanced optical properties with a red shift after the thermal treatment. Photocatalytic studies revealed that the sample annealed at 600 degrees C showed higher photocatalytic activity than samples annealed at lower or higher temperatures in the degradation of the methyl orange. The activity test of all samples is in accordance with photoluminescence measurements, proportional to the concentrations of hydroxyl radicals at the photocatalyst surfaces.",
publisher = "Oxford : Elsevier Sci Ltd.",
journal = "Ceramics International",
title = "Influence of annealing temperature on structural, optical and photocatalytic properties of TiO2-CeO2 nanopowders",
volume = "45",
number = "2",
pages = "2361-2367",
doi = "10.1016/j.ceramint.2018.10.153"
}

Rožić, L., Petrović, S., Lončarević, D., Grbić, B., Radić, N., Stojadinović, S., Jović, V.,& Lamovec, J.. (2019). Influence of annealing temperature on structural, optical and photocatalytic properties of TiO2-CeO2 nanopowders. in Ceramics International
Oxford : Elsevier Sci Ltd.., 45(2), 2361-2367.
https://doi.org/10.1016/j.ceramint.2018.10.153

Rožić L, Petrović S, Lončarević D, Grbić B, Radić N, Stojadinović S, Jović V, Lamovec J. Influence of annealing temperature on structural, optical and photocatalytic properties of TiO2-CeO2 nanopowders. in Ceramics International. 2019;45(2):2361-2367.
doi:10.1016/j.ceramint.2018.10.153 .

Rožić, Ljiljana, Petrović, Srđan, Lončarević, Davor, Grbić, Boško, Radić, Nenad, Stojadinović, Stevan, Jović, Vesna, Lamovec, Jelena, "Influence of annealing temperature on structural, optical and photocatalytic properties of TiO2-CeO2 nanopowders" in Ceramics International, 45, no. 2 (2019):2361-2367,
https://doi.org/10.1016/j.ceramint.2018.10.153 . .

TY  - CONF
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Đuriš, Mihal
AU  - Jaćimovski, Darko
AU  - Arsenijević, Zorana
PY  - 2019
UR  - https://www.shd.org.rs/index.php/proceedings-56
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3303
AB  - In this paper, experimental investigation of the dynamics of the process of fluidized bed granulation was performed, in order to find optimal process conditions and binder concentration to achieve the desired granules development. The experiments were performed in batch system using corn flour as starting material. Ten experiments were performed in which sucrose solution of different concentrations (20, 30, 35 and 40 %) was used as binder. The temperature of the system was kept constant during the granulation process and amounted to 40-50°C. Samples were taken from the fluidized bed at time intervals of 3 min. The dynamics of granulation was examined by determining three different factors (bulk density, moisure content and particle size distribution) for each of the samples. It has been found that bulk density continuously decreases during the granulation process, while in the drying phase it remains constant. Particle size distribution has shown that the average diameter of the projected surface increases uniformly during the process. By comparing all of the three investigated factors, it was shown that the best quality of granules is achieved using 35 % sucrose solution .
AB  - U ovom radu izvršeno je eksperimentalno ispitivanje procesa mokre granulacije u fluidizovanom sloju u cilju pronalaženja optimalnih uslova izvođenja procesa i sastava veziva kojim će se ostvariti željena dinamika razvoja granula. Ispitivanje je izvršeno u šaržnom sistemu, a korišćeno je kukuruzno brašno kao polazni materijal. Izvršeno je 10 eksperimenata u kojima je kao vezivno sredstvo korišćen rastvor saharoze različitih koncentracija: 20, 30, 35 i 40 %. Temperatura je održavana konstantnom tokom procesa granulacije i iznosila je 40-50C. Uzorci su iz sloja uzimani u jednakim vremenskim intervalima od 3 min. Dinamika granulacije ispitivana je određivanjem tri različita faktora (nasipne gustina, vlažnosti i raspodele veličine čestica) za svaki od uzoraka. Utvrđeno je da nasipna gustina kontinualno opada tokom izvođenja procesa granulacije, dok u fazi sušenja ostaje konstantna. Raspodela veličina čestica je pokazala da srednji prečnik projektovane površine ravnomerno raste tokom procesa. Poređenjem sva tri ispitivana faktora pokazano je da se najbolji kvalitet granula postiže korišćenjem 35 % rastvora saharoze kao vezivnog sredstva.
PB  - Serbian Chemical Society, Belgrade / Srpsko hemijsko društvo, Beograd
C3  - 56th Meeting of the Serbian chemical Society - Proceedings / 56. Savetovanje Srpskog hemijskog društva - Knjiga radova, Niš 7-8.9. 2019.
T1  - Investigation of the dynamics of fluidized bed granulation process
T1  - Ispitivanje dinamike granulacije praškastih materijala u fluidizovanom sloju
SP  - 55
EP  - 59
UR  - https://hdl.handle.net/21.15107/rcub_cer_3303
ER  - 

@conference{
author = "Kaluđerović-Radoičić, Tatjana and Đuriš, Mihal and Jaćimovski, Darko and Arsenijević, Zorana",
year = "2019",
abstract = "In this paper, experimental investigation of the dynamics of the process of fluidized bed granulation was performed, in order to find optimal process conditions and binder concentration to achieve the desired granules development. The experiments were performed in batch system using corn flour as starting material. Ten experiments were performed in which sucrose solution of different concentrations (20, 30, 35 and 40 %) was used as binder. The temperature of the system was kept constant during the granulation process and amounted to 40-50°C. Samples were taken from the fluidized bed at time intervals of 3 min. The dynamics of granulation was examined by determining three different factors (bulk density, moisure content and particle size distribution) for each of the samples. It has been found that bulk density continuously decreases during the granulation process, while in the drying phase it remains constant. Particle size distribution has shown that the average diameter of the projected surface increases uniformly during the process. By comparing all of the three investigated factors, it was shown that the best quality of granules is achieved using 35 % sucrose solution ., U ovom radu izvršeno je eksperimentalno ispitivanje procesa mokre granulacije u fluidizovanom sloju u cilju pronalaženja optimalnih uslova izvođenja procesa i sastava veziva kojim će se ostvariti željena dinamika razvoja granula. Ispitivanje je izvršeno u šaržnom sistemu, a korišćeno je kukuruzno brašno kao polazni materijal. Izvršeno je 10 eksperimenata u kojima je kao vezivno sredstvo korišćen rastvor saharoze različitih koncentracija: 20, 30, 35 i 40 %. Temperatura je održavana konstantnom tokom procesa granulacije i iznosila je 40-50C. Uzorci su iz sloja uzimani u jednakim vremenskim intervalima od 3 min. Dinamika granulacije ispitivana je određivanjem tri različita faktora (nasipne gustina, vlažnosti i raspodele veličine čestica) za svaki od uzoraka. Utvrđeno je da nasipna gustina kontinualno opada tokom izvođenja procesa granulacije, dok u fazi sušenja ostaje konstantna. Raspodela veličina čestica je pokazala da srednji prečnik projektovane površine ravnomerno raste tokom procesa. Poređenjem sva tri ispitivana faktora pokazano je da se najbolji kvalitet granula postiže korišćenjem 35 % rastvora saharoze kao vezivnog sredstva.",
publisher = "Serbian Chemical Society, Belgrade / Srpsko hemijsko društvo, Beograd",
journal = "56th Meeting of the Serbian chemical Society - Proceedings / 56. Savetovanje Srpskog hemijskog društva - Knjiga radova, Niš 7-8.9. 2019.",
title = "Investigation of the dynamics of fluidized bed granulation process, Ispitivanje dinamike granulacije praškastih materijala u fluidizovanom sloju",
pages = "55-59",
url = "https://hdl.handle.net/21.15107/rcub_cer_3303"
}

Kaluđerović-Radoičić, T., Đuriš, M., Jaćimovski, D.,& Arsenijević, Z.. (2019). Investigation of the dynamics of fluidized bed granulation process. in 56th Meeting of the Serbian chemical Society - Proceedings / 56. Savetovanje Srpskog hemijskog društva - Knjiga radova, Niš 7-8.9. 2019.
Serbian Chemical Society, Belgrade / Srpsko hemijsko društvo, Beograd., 55-59.
https://hdl.handle.net/21.15107/rcub_cer_3303

Kaluđerović-Radoičić T, Đuriš M, Jaćimovski D, Arsenijević Z. Investigation of the dynamics of fluidized bed granulation process. in 56th Meeting of the Serbian chemical Society - Proceedings / 56. Savetovanje Srpskog hemijskog društva - Knjiga radova, Niš 7-8.9. 2019.. 2019;:55-59.
https://hdl.handle.net/21.15107/rcub_cer_3303 .

Kaluđerović-Radoičić, Tatjana, Đuriš, Mihal, Jaćimovski, Darko, Arsenijević, Zorana, "Investigation of the dynamics of fluidized bed granulation process" in 56th Meeting of the Serbian chemical Society - Proceedings / 56. Savetovanje Srpskog hemijskog društva - Knjiga radova, Niš 7-8.9. 2019. (2019):55-59,
https://hdl.handle.net/21.15107/rcub_cer_3303 .

TY  - JOUR
AU  - Đuriš, Mihal
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Jaćimovski, Darko
AU  - Arsenijević, Zorana
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3393
AB  - In this paper, an innovative fluidized bed dryer with inert particles is presented. The system can be used for drying of solutions, suspensions and pastes in order to obtain a powdered product. The experiments were performed in a pilot-scale dryer with a cylindrical column 0.215 m in diameter and 1.2 mm height, with glass spheres as inert particles. The material used for drying was CuSO4 solution. The effects of operating conditions on the dryer throughput and product quality were investigated. Main performance criteria, i.e. specific water evaporation rate, specific heat consumption and specific air consumption, were quantified. Nearly isothermal conditions were found due to thorough mixing of the particles. The energy efficiency of the dryer was also assessed. Simple heat and mass balances predicted the dryer performance quite well.
AB  - U ovom radu je predstavljen inovativni sušionik sa fluidizovanim slojem inertnih čestica. Prikazani sistem može da se koristi za sušenje rastvora, suspenzija i pasti u cilju dobijanja praškastog produkta. Eksperimenti su rađeni na pilot postrojenju čiji je centralni deo cilindrična kolona prečnika 215 mm i visine 1200 mm. Korišćene su staklene sfere kao inertne čestice. U radu je prikazano sušenje rastvora CuSO4. Ispitivan je uticaj operativnih uslova na performanse sistema za sušenje, kao i na 
kvalitet praškastog produkta. Kvantifikovani su glavni parametri koji opisuju performanse sušionika, kao što su specifična brzina isparavanja, specifična potrošnja toplote i specifična potrošnja vazduha. Usled intenzivnog mešanja u fluidizovanom sloju postižu se približno izotermni uslovi sušenja. Izvršena je procena energetske efikasnosti sušenja. Jednostavni bilansi prenosa mase i toplote adekvatno predviđaju radni režim sistema za sušenje.
PB  - Belgrade : Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - High efficiency disperse dryer - an innovative process for drying of solutions, suspensions and pastes in a fluidized bed of inert particles
T1  - Visokoefikasni disperzni sušionik – Inovativni proces sušenja rastvora, suspenzija i pasti u fluidizovanom sloju inertnih čestica
VL  - 73
IS  - 4
SP  - 213
EP  - 222
DO  - 10.2298/HEMIND190626021D
ER  - 

@article{
author = "Đuriš, Mihal and Kaluđerović-Radoičić, Tatjana and Jaćimovski, Darko and Arsenijević, Zorana",
year = "2019",
abstract = "In this paper, an innovative fluidized bed dryer with inert particles is presented. The system can be used for drying of solutions, suspensions and pastes in order to obtain a powdered product. The experiments were performed in a pilot-scale dryer with a cylindrical column 0.215 m in diameter and 1.2 mm height, with glass spheres as inert particles. The material used for drying was CuSO4 solution. The effects of operating conditions on the dryer throughput and product quality were investigated. Main performance criteria, i.e. specific water evaporation rate, specific heat consumption and specific air consumption, were quantified. Nearly isothermal conditions were found due to thorough mixing of the particles. The energy efficiency of the dryer was also assessed. Simple heat and mass balances predicted the dryer performance quite well., U ovom radu je predstavljen inovativni sušionik sa fluidizovanim slojem inertnih čestica. Prikazani sistem može da se koristi za sušenje rastvora, suspenzija i pasti u cilju dobijanja praškastog produkta. Eksperimenti su rađeni na pilot postrojenju čiji je centralni deo cilindrična kolona prečnika 215 mm i visine 1200 mm. Korišćene su staklene sfere kao inertne čestice. U radu je prikazano sušenje rastvora CuSO4. Ispitivan je uticaj operativnih uslova na performanse sistema za sušenje, kao i na 
kvalitet praškastog produkta. Kvantifikovani su glavni parametri koji opisuju performanse sušionika, kao što su specifična brzina isparavanja, specifična potrošnja toplote i specifična potrošnja vazduha. Usled intenzivnog mešanja u fluidizovanom sloju postižu se približno izotermni uslovi sušenja. Izvršena je procena energetske efikasnosti sušenja. Jednostavni bilansi prenosa mase i toplote adekvatno predviđaju radni režim sistema za sušenje.",
publisher = "Belgrade : Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "High efficiency disperse dryer - an innovative process for drying of solutions, suspensions and pastes in a fluidized bed of inert particles, Visokoefikasni disperzni sušionik – Inovativni proces sušenja rastvora, suspenzija i pasti u fluidizovanom sloju inertnih čestica",
volume = "73",
number = "4",
pages = "213-222",
doi = "10.2298/HEMIND190626021D"
}

Đuriš, M., Kaluđerović-Radoičić, T., Jaćimovski, D.,& Arsenijević, Z.. (2019). High efficiency disperse dryer - an innovative process for drying of solutions, suspensions and pastes in a fluidized bed of inert particles. in Hemijska industrija
Belgrade : Association of Chemical Engineers of Serbia., 73(4), 213-222.
https://doi.org/10.2298/HEMIND190626021D

Đuriš M, Kaluđerović-Radoičić T, Jaćimovski D, Arsenijević Z. High efficiency disperse dryer - an innovative process for drying of solutions, suspensions and pastes in a fluidized bed of inert particles. in Hemijska industrija. 2019;73(4):213-222.
doi:10.2298/HEMIND190626021D .

Đuriš, Mihal, Kaluđerović-Radoičić, Tatjana, Jaćimovski, Darko, Arsenijević, Zorana, "High efficiency disperse dryer - an innovative process for drying of solutions, suspensions and pastes in a fluidized bed of inert particles" in Hemijska industrija, 73, no. 4 (2019):213-222,
https://doi.org/10.2298/HEMIND190626021D . .

TY  - JOUR
AU  - Đuriš, Mihal
AU  - Arsenijević, Zorana
AU  - Povrenović, Dragan
AU  - Kaluđerović Radoičić, Tatjana
PY  - 2019
UR  - https://izdanja.smeits.rs/index.php/procteh/article/view/6028
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4458
AB  - Waste  water  treatment  sludge  is  generated  in  increasing  
quantities,   as   the   amount   of   treated   municipal   and   
industrial  waste  water  increases.  Also,  the  requirements  
concerning the conditions of sludge storage/landfill or reuse are 
growing.  Due  to  these  reasons,  new  solutions  regarding  sludge  
treatment, management and utilization are needed [1]. The benefits 
of  drying  waste  water  treatment  sludge  can  be  seen  in  several  
aspects:  the  dried  sludge  can  be  stored  for  longer  periods  of  time  
and  further  used  as  an  organic  fertilizer,  it  can  be  a  source  of  
useful  (active)  microorganisms  that  can  be  reused  in  waste  water  
treatment.  Drying  also  enables  incineration  or  co-incineration  of  
sludge.  Sludge  drying  process  reduces  mass  and  volume  of  the  
product, making its storage, transport, packaging and retail easier 
[2-4].
AB  - Sušenjem mulja iz procesa prečišćavanja otpadnih voda mogu se dobiti dva glavna upotrebljiva proizvoda: osušeni mulj može se skladištiti i koristiti kao organsko đubrivo, a može sadržati i aktivne (žive) mikroorganizme koji se ponovo mogu koristiti u tretmanu otpadnih voda. Sušenje suspenzija i pasta u fluidizovanom sloju inertnih čestica predstavlja atraktivnu alternativu ostalim postupcima sušenja u pogledu osnovnih kriterijuma za ocenu efikasnosti kao što su specifični kapacitet isparavanja, specifični utrošak toplote i specifični utrošak vazduha. Visoka efikasnost sušenja je rezultat velikih kontaktnih površina i velikih temperaturnih razlika između ulaznog i izlaznog toka vazduha za sušenje. Intenzivno mešanje inertnih čestica tokom agregativne fluidizacije obezbeđuje približno jednaku temperaturu u celoj zapremini sloja te ne postoji rizik od lokalnog pregrevanja. U radu su prikazani rezultati ispitivanja sušenja mulja na pilot postrojenju za sušenje suspenzija i pasta nominalnog kapaciteta isparavanja do20 kgH2O/h, čiji je centralni deo cilindrična kolona prečnika 215 mm sa fluidizovanim slojem staklenih sfera. Ispitivan je uticaj operativnih uslova na performanse sistema za sušenje i na kvalitet praškastog osušenog aktivnog mulja. Glavni cilj je da se odrede optimalne temperature sušenja mulja pri kojima bi korisni mikroorganizmu u mulju ostali aktivni (živi), a pri kojim aktivni mulj može da se koristi kao oragansko đubrivo. Izvršena je analiza efikasnosti sušenja sa stanovišta kapaciteta isparavanja i potrošnje vazduha u cilju boljeg sagledavanja performansi sistema za sušenje. Jednostavni bilansi mase i toplote adekvatno predviđaju radni režim sistema za sušenje u fluidizovanom sloju inertnog materijala.
PB  - Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS
T2  - Procesna tehnika
T1  - Drying of waste water treatment sludge in fluidized bed of inert particles
T1  - Sušenje mulja iz procesa prečišćavanja otpadnih voda u fluidizovanom sloju inertnih čestica
VL  - 31
IS  - 2
SP  - 14
EP  - 18
DO  - 10.24094/ptc.019.31.2.14
ER  - 

@article{
author = "Đuriš, Mihal and Arsenijević, Zorana and Povrenović, Dragan and Kaluđerović Radoičić, Tatjana",
year = "2019",
abstract = "Waste  water  treatment  sludge  is  generated  in  increasing  
quantities,   as   the   amount   of   treated   municipal   and   
industrial  waste  water  increases.  Also,  the  requirements  
concerning the conditions of sludge storage/landfill or reuse are 
growing.  Due  to  these  reasons,  new  solutions  regarding  sludge  
treatment, management and utilization are needed [1]. The benefits 
of  drying  waste  water  treatment  sludge  can  be  seen  in  several  
aspects:  the  dried  sludge  can  be  stored  for  longer  periods  of  time  
and  further  used  as  an  organic  fertilizer,  it  can  be  a  source  of  
useful  (active)  microorganisms  that  can  be  reused  in  waste  water  
treatment.  Drying  also  enables  incineration  or  co-incineration  of  
sludge.  Sludge  drying  process  reduces  mass  and  volume  of  the  
product, making its storage, transport, packaging and retail easier 
[2-4]., Sušenjem mulja iz procesa prečišćavanja otpadnih voda mogu se dobiti dva glavna upotrebljiva proizvoda: osušeni mulj može se skladištiti i koristiti kao organsko đubrivo, a može sadržati i aktivne (žive) mikroorganizme koji se ponovo mogu koristiti u tretmanu otpadnih voda. Sušenje suspenzija i pasta u fluidizovanom sloju inertnih čestica predstavlja atraktivnu alternativu ostalim postupcima sušenja u pogledu osnovnih kriterijuma za ocenu efikasnosti kao što su specifični kapacitet isparavanja, specifični utrošak toplote i specifični utrošak vazduha. Visoka efikasnost sušenja je rezultat velikih kontaktnih površina i velikih temperaturnih razlika između ulaznog i izlaznog toka vazduha za sušenje. Intenzivno mešanje inertnih čestica tokom agregativne fluidizacije obezbeđuje približno jednaku temperaturu u celoj zapremini sloja te ne postoji rizik od lokalnog pregrevanja. U radu su prikazani rezultati ispitivanja sušenja mulja na pilot postrojenju za sušenje suspenzija i pasta nominalnog kapaciteta isparavanja do20 kgH2O/h, čiji je centralni deo cilindrična kolona prečnika 215 mm sa fluidizovanim slojem staklenih sfera. Ispitivan je uticaj operativnih uslova na performanse sistema za sušenje i na kvalitet praškastog osušenog aktivnog mulja. Glavni cilj je da se odrede optimalne temperature sušenja mulja pri kojima bi korisni mikroorganizmu u mulju ostali aktivni (živi), a pri kojim aktivni mulj može da se koristi kao oragansko đubrivo. Izvršena je analiza efikasnosti sušenja sa stanovišta kapaciteta isparavanja i potrošnje vazduha u cilju boljeg sagledavanja performansi sistema za sušenje. Jednostavni bilansi mase i toplote adekvatno predviđaju radni režim sistema za sušenje u fluidizovanom sloju inertnog materijala.",
publisher = "Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS",
journal = "Procesna tehnika",
title = "Drying of waste water treatment sludge in fluidized bed of inert particles, Sušenje mulja iz procesa prečišćavanja otpadnih voda u fluidizovanom sloju inertnih čestica",
volume = "31",
number = "2",
pages = "14-18",
doi = "10.24094/ptc.019.31.2.14"
}

Đuriš, M., Arsenijević, Z., Povrenović, D.,& Kaluđerović Radoičić, T.. (2019). Drying of waste water treatment sludge in fluidized bed of inert particles. in Procesna tehnika
Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS., 31(2), 14-18.
https://doi.org/10.24094/ptc.019.31.2.14

Đuriš M, Arsenijević Z, Povrenović D, Kaluđerović Radoičić T. Drying of waste water treatment sludge in fluidized bed of inert particles. in Procesna tehnika. 2019;31(2):14-18.
doi:10.24094/ptc.019.31.2.14 .

Đuriš, Mihal, Arsenijević, Zorana, Povrenović, Dragan, Kaluđerović Radoičić, Tatjana, "Drying of waste water treatment sludge in fluidized bed of inert particles" in Procesna tehnika, 31, no. 2 (2019):14-18,
https://doi.org/10.24094/ptc.019.31.2.14 . .

TY  - CONF
AU  - Felischak, Matthias
AU  - Nikolić, Daliborka
AU  - Petkovska, Menka
AU  - Seidel-Morgenstern, Andreas
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3816
AB  - The classical design of continuously operated chemical reactors assumes that they are operated in a steady-state which is usually optimized and maintained by using appropriate control systems. Nevertheless, it has been known for quite some time that, in some cases, better performance can be achieved by applying a periodic regime exploiting forced modulations of one or more inputs to the reactor [1,2]. Finding out whether, at which conditions and to which extent periodic operation can be superior to the optimal steady-state is difficult. One approach that can be used is an approximate, analytical method called nonlinear frequency response (NFR) method [3].

The NFR method is based on the concept of higher order frequency response functions (FRFs) and applicable for weakly nonlinear systems [3]. Frequency response of a weakly nonlinear system, in addition to the basic harmonic, contains a non-periodic (DC) term and, theoretically, an infinite sequence of higher harmonics. The DC component of the output is responsible for the average performance of the periodically operated reactor, and its sign and value define whether, and to which extent, the periodic operation leads to process improvement. Using the NFR method, this DC component can be approximately estimated from a single asymmetrical second order FRF (for modulation of a single input) or from several single input and cross- asymmetrical second order FRFs (for multiple-input modulation). For the case of multiple modulated inputs, the optimal phase difference between the modulated inputs, which is an essential parameter, can be directly determined [4,5]. Promising parameters to be periodically modulated separately or simultaneously are clearly the reactant inlet concentrations, the flow-rates and the feed temperatures. 

We used the NFR method in order to identify forced periodic conditions under which the acetic acid anhydride hydrolysis (chosen as a test reaction) can be favorably performed in a CSTR. Based on the results of the theoretical analysis, experimental investigations were performed using a lab-scale reactor exposed to two fluctuating inlet streams (water and acetic anhydride) with adjustable flow-rates, which enables modulation of the inlet reactant concentrations or/and total flow-rates in a flexible manner. The concentration of the acetic acid formed is measured in the reactor online and used to monitor the process dynamics. Averaged values of the product outlet stream serve to validate the mean values predicted by NFR analysis and to evaluate the potential of this flexible forcing strategy.
C3  - American Institute of Chemical Engineers Annual Meeting (AIChE Annual Meeting), Pittsburgh, USA
T1  - Forced periodic reactor operation with simultaneous modulation of two inputs: Nonlinear frequency response analysis  and experimental demonstration
UR  - https://hdl.handle.net/21.15107/rcub_cer_3816
ER  - 

@conference{
author = "Felischak, Matthias and Nikolić, Daliborka and Petkovska, Menka and Seidel-Morgenstern, Andreas",
year = "2018",
abstract = "The classical design of continuously operated chemical reactors assumes that they are operated in a steady-state which is usually optimized and maintained by using appropriate control systems. Nevertheless, it has been known for quite some time that, in some cases, better performance can be achieved by applying a periodic regime exploiting forced modulations of one or more inputs to the reactor [1,2]. Finding out whether, at which conditions and to which extent periodic operation can be superior to the optimal steady-state is difficult. One approach that can be used is an approximate, analytical method called nonlinear frequency response (NFR) method [3].

The NFR method is based on the concept of higher order frequency response functions (FRFs) and applicable for weakly nonlinear systems [3]. Frequency response of a weakly nonlinear system, in addition to the basic harmonic, contains a non-periodic (DC) term and, theoretically, an infinite sequence of higher harmonics. The DC component of the output is responsible for the average performance of the periodically operated reactor, and its sign and value define whether, and to which extent, the periodic operation leads to process improvement. Using the NFR method, this DC component can be approximately estimated from a single asymmetrical second order FRF (for modulation of a single input) or from several single input and cross- asymmetrical second order FRFs (for multiple-input modulation). For the case of multiple modulated inputs, the optimal phase difference between the modulated inputs, which is an essential parameter, can be directly determined [4,5]. Promising parameters to be periodically modulated separately or simultaneously are clearly the reactant inlet concentrations, the flow-rates and the feed temperatures. 

We used the NFR method in order to identify forced periodic conditions under which the acetic acid anhydride hydrolysis (chosen as a test reaction) can be favorably performed in a CSTR. Based on the results of the theoretical analysis, experimental investigations were performed using a lab-scale reactor exposed to two fluctuating inlet streams (water and acetic anhydride) with adjustable flow-rates, which enables modulation of the inlet reactant concentrations or/and total flow-rates in a flexible manner. The concentration of the acetic acid formed is measured in the reactor online and used to monitor the process dynamics. Averaged values of the product outlet stream serve to validate the mean values predicted by NFR analysis and to evaluate the potential of this flexible forcing strategy.",
journal = "American Institute of Chemical Engineers Annual Meeting (AIChE Annual Meeting), Pittsburgh, USA",
title = "Forced periodic reactor operation with simultaneous modulation of two inputs: Nonlinear frequency response analysis  and experimental demonstration",
url = "https://hdl.handle.net/21.15107/rcub_cer_3816"
}

Felischak, M., Nikolić, D., Petkovska, M.,& Seidel-Morgenstern, A.. (2018). Forced periodic reactor operation with simultaneous modulation of two inputs: Nonlinear frequency response analysis  and experimental demonstration. in American Institute of Chemical Engineers Annual Meeting (AIChE Annual Meeting), Pittsburgh, USA.
https://hdl.handle.net/21.15107/rcub_cer_3816

Felischak M, Nikolić D, Petkovska M, Seidel-Morgenstern A. Forced periodic reactor operation with simultaneous modulation of two inputs: Nonlinear frequency response analysis  and experimental demonstration. in American Institute of Chemical Engineers Annual Meeting (AIChE Annual Meeting), Pittsburgh, USA. 2018;.
https://hdl.handle.net/21.15107/rcub_cer_3816 .

Felischak, Matthias, Nikolić, Daliborka, Petkovska, Menka, Seidel-Morgenstern, Andreas, "Forced periodic reactor operation with simultaneous modulation of two inputs: Nonlinear frequency response analysis  and experimental demonstration" in American Institute of Chemical Engineers Annual Meeting (AIChE Annual Meeting), Pittsburgh, USA (2018),
https://hdl.handle.net/21.15107/rcub_cer_3816 .

TY  - CONF
AU  - Currie, Robert
AU  - Nikolić, Daliborka
AU  - Petkovska, Menka
AU  - Simakov, David
PY  - 2018
UR  - https://www.aidic.it/iscre25/programme.php
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3836
AB  - Nonlinear frequency response (NFR) analysis was applied on a Sabatier reactor. A substantial improvement in CO2 conversion was predicted under certain conditions. The NFR analysis prediction was validated using a kinetic flow reactor model. A comprehensive packed bed model was analyzed using NFR as a guidance.
C3  - The 25th International Symposium of Chemical Reaction Engineering (ISCRE 25), Florance, Italy
T1  - CO2 conversion enhancement in a periodically operated Sabatier reactor: Nonlinear frequency response analysis and simulation- based Study
SP  - P52
UR  - https://hdl.handle.net/21.15107/rcub_cer_3836
ER  - 

@conference{
author = "Currie, Robert and Nikolić, Daliborka and Petkovska, Menka and Simakov, David",
year = "2018",
abstract = "Nonlinear frequency response (NFR) analysis was applied on a Sabatier reactor. A substantial improvement in CO2 conversion was predicted under certain conditions. The NFR analysis prediction was validated using a kinetic flow reactor model. A comprehensive packed bed model was analyzed using NFR as a guidance.",
journal = "The 25th International Symposium of Chemical Reaction Engineering (ISCRE 25), Florance, Italy",
title = "CO2 conversion enhancement in a periodically operated Sabatier reactor: Nonlinear frequency response analysis and simulation- based Study",
pages = "P52",
url = "https://hdl.handle.net/21.15107/rcub_cer_3836"
}

Currie, R., Nikolić, D., Petkovska, M.,& Simakov, D.. (2018). CO2 conversion enhancement in a periodically operated Sabatier reactor: Nonlinear frequency response analysis and simulation- based Study. in The 25th International Symposium of Chemical Reaction Engineering (ISCRE 25), Florance, Italy, P52.
https://hdl.handle.net/21.15107/rcub_cer_3836

Currie R, Nikolić D, Petkovska M, Simakov D. CO2 conversion enhancement in a periodically operated Sabatier reactor: Nonlinear frequency response analysis and simulation- based Study. in The 25th International Symposium of Chemical Reaction Engineering (ISCRE 25), Florance, Italy. 2018;:P52.
https://hdl.handle.net/21.15107/rcub_cer_3836 .

Currie, Robert, Nikolić, Daliborka, Petkovska, Menka, Simakov, David, "CO2 conversion enhancement in a periodically operated Sabatier reactor: Nonlinear frequency response analysis and simulation- based Study" in The 25th International Symposium of Chemical Reaction Engineering (ISCRE 25), Florance, Italy (2018):P52,
https://hdl.handle.net/21.15107/rcub_cer_3836 .

TY  - CONF
AU  - Felischak, Matthias
AU  - Nikolić, Daliborka
AU  - Petkovska, Menka
AU  - Seidel-Morgenstern, Andreas
PY  - 2018
UR  - https://www.aidic.it/iscre25/programme.php
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3839
AB  - Theoretical evaluation of possible reactor improvement for periodic operation. Automated experimental setup was built, with a lab-scale CSTR and adjustable flow-rates, in which periodic operations can be conducted. The concept was implemented for the hydrolysis of acetic anhydride as a model reaction.
C3  - The 25th International Symposium of Chemical Reaction Engineering (ISCRE 25), Florance, Italy
T1  - Forced periodic reactor operation with simultaneous modulation of two inputs: Experimental investigation based on Nonlinear Frequency Response Analysis
UR  - https://hdl.handle.net/21.15107/rcub_cer_3839
ER  - 

@conference{
author = "Felischak, Matthias and Nikolić, Daliborka and Petkovska, Menka and Seidel-Morgenstern, Andreas",
year = "2018",
abstract = "Theoretical evaluation of possible reactor improvement for periodic operation. Automated experimental setup was built, with a lab-scale CSTR and adjustable flow-rates, in which periodic operations can be conducted. The concept was implemented for the hydrolysis of acetic anhydride as a model reaction.",
journal = "The 25th International Symposium of Chemical Reaction Engineering (ISCRE 25), Florance, Italy",
title = "Forced periodic reactor operation with simultaneous modulation of two inputs: Experimental investigation based on Nonlinear Frequency Response Analysis",
url = "https://hdl.handle.net/21.15107/rcub_cer_3839"
}

Felischak, M., Nikolić, D., Petkovska, M.,& Seidel-Morgenstern, A.. (2018). Forced periodic reactor operation with simultaneous modulation of two inputs: Experimental investigation based on Nonlinear Frequency Response Analysis. in The 25th International Symposium of Chemical Reaction Engineering (ISCRE 25), Florance, Italy.
https://hdl.handle.net/21.15107/rcub_cer_3839

Felischak M, Nikolić D, Petkovska M, Seidel-Morgenstern A. Forced periodic reactor operation with simultaneous modulation of two inputs: Experimental investigation based on Nonlinear Frequency Response Analysis. in The 25th International Symposium of Chemical Reaction Engineering (ISCRE 25), Florance, Italy. 2018;.
https://hdl.handle.net/21.15107/rcub_cer_3839 .

Felischak, Matthias, Nikolić, Daliborka, Petkovska, Menka, Seidel-Morgenstern, Andreas, "Forced periodic reactor operation with simultaneous modulation of two inputs: Experimental investigation based on Nonlinear Frequency Response Analysis" in The 25th International Symposium of Chemical Reaction Engineering (ISCRE 25), Florance, Italy (2018),
https://hdl.handle.net/21.15107/rcub_cer_3839 .

TY  - CONF
AU  - Currie, Robert
AU  - Nikolić, Daliborka
AU  - Petkovska, Menka
AU  - Simakov, David
PY  - 2018
UR  - https://www.aidic.it/iscre25/programme.php
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3837
AB  - Poster presented at: The 25th International Symposium of Chemical Reaction Engineering (ISCRE 25), Florance, Italy, 20-23 May 2018
T1  - CO2 conversion enhancement in a periodically operated Sabatier reactor: Nonlinear frequency response analysis and simulation- based Study
UR  - https://hdl.handle.net/21.15107/rcub_cer_3837
ER  - 

@conference{
author = "Currie, Robert and Nikolić, Daliborka and Petkovska, Menka and Simakov, David",
year = "2018",
abstract = "Poster presented at: The 25th International Symposium of Chemical Reaction Engineering (ISCRE 25), Florance, Italy, 20-23 May 2018",
title = "CO2 conversion enhancement in a periodically operated Sabatier reactor: Nonlinear frequency response analysis and simulation- based Study",
url = "https://hdl.handle.net/21.15107/rcub_cer_3837"
}

Currie, R., Nikolić, D., Petkovska, M.,& Simakov, D.. (2018). CO2 conversion enhancement in a periodically operated Sabatier reactor: Nonlinear frequency response analysis and simulation- based Study. .
https://hdl.handle.net/21.15107/rcub_cer_3837

Currie R, Nikolić D, Petkovska M, Simakov D. CO2 conversion enhancement in a periodically operated Sabatier reactor: Nonlinear frequency response analysis and simulation- based Study. 2018;.
https://hdl.handle.net/21.15107/rcub_cer_3837 .

Currie, Robert, Nikolić, Daliborka, Petkovska, Menka, Simakov, David, "CO2 conversion enhancement in a periodically operated Sabatier reactor: Nonlinear frequency response analysis and simulation- based Study" (2018),
https://hdl.handle.net/21.15107/rcub_cer_3837 .

TY  - JOUR
AU  - Stojadinović, Stevan
AU  - Tadić, Nenad
AU  - Radić, Nenad
AU  - Grbić, Boško
AU  - Vasilić, Rastko
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2292
AB  - Tb doped TiO2 coatings are formed by plasma electrolytic oxidation (PEO) of titanium in water solution of 10 g/L Na3PO4.12H(2)O with addition of Tb4O7 powder. Surface morphology, chemical, and phase composition of obtained PEO coatings are investigated utilizing scanning electron microscopy equipped with energy dispersive x-ray spectroscopy and X-ray diffraction. Uniformly distributed Ti, O, P, and Tb are identified as the main constituents of the coatings. Diffraction patterns of obtained coatings show well pronounced reflections inherent to anatase phase of TiO2. Performed photoluminescence measurements indicate that incorporated Tb is in trivalent oxidation state. Photoluminescence emission spectra feature two overlapping regions: the first region is related to band of TiO2 host and the second region which features several emission bands is ascribed to f-f transitions of Tb3+ from excited level D-5(4) to lower levels F-7(J) (J = 3,4,5, and 6). The photocatalytic activity (PA) of Tb3+ doped TiO2 coatings is probed by measuring the photodegradation of methyl orange under simulated sunlight conditions, suggesting that the main factor affecting PA is concentration of Tb3+ ions incorporated into coatings. Tb3+ doped TiO2 coatings formed for short time have better PA than pure TiO2 coatings formed under the same conditions; the highest PA is observed for the coating formed after 1 min of PEO process. Presence of Tb3+ ions into TiO2 coatings in small concentration improves PA through effective suppression of electron/hole recombination.
PB  - Elsevier
T2  - Surface and Coatings Technology
T1  - Effect of Tb3+ doping on the photocatalytic activity of TiO2 coatings formed by plasma electrolytic oxidation of titanium
VL  - 337
SP  - 279
EP  - 289
DO  - 10.1016/j.surfcoat.2018.01.033
ER  - 

@article{
author = "Stojadinović, Stevan and Tadić, Nenad and Radić, Nenad and Grbić, Boško and Vasilić, Rastko",
year = "2018",
abstract = "Tb doped TiO2 coatings are formed by plasma electrolytic oxidation (PEO) of titanium in water solution of 10 g/L Na3PO4.12H(2)O with addition of Tb4O7 powder. Surface morphology, chemical, and phase composition of obtained PEO coatings are investigated utilizing scanning electron microscopy equipped with energy dispersive x-ray spectroscopy and X-ray diffraction. Uniformly distributed Ti, O, P, and Tb are identified as the main constituents of the coatings. Diffraction patterns of obtained coatings show well pronounced reflections inherent to anatase phase of TiO2. Performed photoluminescence measurements indicate that incorporated Tb is in trivalent oxidation state. Photoluminescence emission spectra feature two overlapping regions: the first region is related to band of TiO2 host and the second region which features several emission bands is ascribed to f-f transitions of Tb3+ from excited level D-5(4) to lower levels F-7(J) (J = 3,4,5, and 6). The photocatalytic activity (PA) of Tb3+ doped TiO2 coatings is probed by measuring the photodegradation of methyl orange under simulated sunlight conditions, suggesting that the main factor affecting PA is concentration of Tb3+ ions incorporated into coatings. Tb3+ doped TiO2 coatings formed for short time have better PA than pure TiO2 coatings formed under the same conditions; the highest PA is observed for the coating formed after 1 min of PEO process. Presence of Tb3+ ions into TiO2 coatings in small concentration improves PA through effective suppression of electron/hole recombination.",
publisher = "Elsevier",
journal = "Surface and Coatings Technology",
title = "Effect of Tb3+ doping on the photocatalytic activity of TiO2 coatings formed by plasma electrolytic oxidation of titanium",
volume = "337",
pages = "279-289",
doi = "10.1016/j.surfcoat.2018.01.033"
}

Stojadinović, S., Tadić, N., Radić, N., Grbić, B.,& Vasilić, R.. (2018). Effect of Tb3+ doping on the photocatalytic activity of TiO2 coatings formed by plasma electrolytic oxidation of titanium. in Surface and Coatings Technology
Elsevier., 337, 279-289.
https://doi.org/10.1016/j.surfcoat.2018.01.033

Stojadinović S, Tadić N, Radić N, Grbić B, Vasilić R. Effect of Tb3+ doping on the photocatalytic activity of TiO2 coatings formed by plasma electrolytic oxidation of titanium. in Surface and Coatings Technology. 2018;337:279-289.
doi:10.1016/j.surfcoat.2018.01.033 .

Stojadinović, Stevan, Tadić, Nenad, Radić, Nenad, Grbić, Boško, Vasilić, Rastko, "Effect of Tb3+ doping on the photocatalytic activity of TiO2 coatings formed by plasma electrolytic oxidation of titanium" in Surface and Coatings Technology, 337 (2018):279-289,
https://doi.org/10.1016/j.surfcoat.2018.01.033 . .

TY  - JOUR
AU  - Stojadinović, Stevan
AU  - Radić, Nenad
AU  - Tadić, Nenad
AU  - Vasilić, Rastko
AU  - Stefanov, Plamen
AU  - Grbić, Boško
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2307
AB  - This paper presents the results of our recent investigation focused on the preparation and possible photocatalytic application of iron doped TiO2 coatings formed by plasma electrolytic oxidation of high purity titanium in electrolyte containing FeSO4. The morphology, phase and elemental composition, and absorption band of the coatings were characterized by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and diffuse reflectance spectroscopy. The photocatalytic activity of coatings was evaluated by measuring the degradation of methyl orange under simulated sunlight conditions. It was found that the addition of iron precursor to electrolyte solution improves the photocatalytic properties of obtained coatings with respect to pure TiO2 coating. The incorporation of iron in TiO2 lattice was identified as the main factor affecting the increase of photocatalytic activity. The highest photocatalytic activity was observed when coatings were processed for 2 min with addition of 1 g/L FeSO4 to electrolyte.
PB  - Springer, Dordrecht
T2  - Journal of Materials Science-Materials in Electronics
T1  - Influence of iron doping on photocatalytic activity of TiO2 coatings formed on titanium by plasma electrolytic oxidation
VL  - 29
IS  - 11
SP  - 9427
EP  - 9434
DO  - 10.1007/s10854-018-8975-6
ER  - 

@article{
author = "Stojadinović, Stevan and Radić, Nenad and Tadić, Nenad and Vasilić, Rastko and Stefanov, Plamen and Grbić, Boško",
year = "2018",
abstract = "This paper presents the results of our recent investigation focused on the preparation and possible photocatalytic application of iron doped TiO2 coatings formed by plasma electrolytic oxidation of high purity titanium in electrolyte containing FeSO4. The morphology, phase and elemental composition, and absorption band of the coatings were characterized by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and diffuse reflectance spectroscopy. The photocatalytic activity of coatings was evaluated by measuring the degradation of methyl orange under simulated sunlight conditions. It was found that the addition of iron precursor to electrolyte solution improves the photocatalytic properties of obtained coatings with respect to pure TiO2 coating. The incorporation of iron in TiO2 lattice was identified as the main factor affecting the increase of photocatalytic activity. The highest photocatalytic activity was observed when coatings were processed for 2 min with addition of 1 g/L FeSO4 to electrolyte.",
publisher = "Springer, Dordrecht",
journal = "Journal of Materials Science-Materials in Electronics",
title = "Influence of iron doping on photocatalytic activity of TiO2 coatings formed on titanium by plasma electrolytic oxidation",
volume = "29",
number = "11",
pages = "9427-9434",
doi = "10.1007/s10854-018-8975-6"
}

Stojadinović, S., Radić, N., Tadić, N., Vasilić, R., Stefanov, P.,& Grbić, B.. (2018). Influence of iron doping on photocatalytic activity of TiO2 coatings formed on titanium by plasma electrolytic oxidation. in Journal of Materials Science-Materials in Electronics
Springer, Dordrecht., 29(11), 9427-9434.
https://doi.org/10.1007/s10854-018-8975-6

Stojadinović S, Radić N, Tadić N, Vasilić R, Stefanov P, Grbić B. Influence of iron doping on photocatalytic activity of TiO2 coatings formed on titanium by plasma electrolytic oxidation. in Journal of Materials Science-Materials in Electronics. 2018;29(11):9427-9434.
doi:10.1007/s10854-018-8975-6 .

Stojadinović, Stevan, Radić, Nenad, Tadić, Nenad, Vasilić, Rastko, Stefanov, Plamen, Grbić, Boško, "Influence of iron doping on photocatalytic activity of TiO2 coatings formed on titanium by plasma electrolytic oxidation" in Journal of Materials Science-Materials in Electronics, 29, no. 11 (2018):9427-9434,
https://doi.org/10.1007/s10854-018-8975-6 . .

TY  - JOUR
AU  - Petrović, Srđan
AU  - Rožić, Ljiljana
AU  - Stojadinović, Stevan
AU  - Grbić, Boško
AU  - Vasilić, Rastko
AU  - Vuković, Zorica
AU  - Radić, Nenad
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2349
AB  - In this study, WO3 doped TiO2 powders were synthesized via sol-gel method combined with a hydrothermal process. The effect of sintering temperature on mesoporous structure and catalytic activities of these powders were investigated. The physical analysis via X-ray diffraction indicates that prepared samples are a mixture of anatase and rutile TiO2 phases. X-ray peak analysis is used to evaluate the crystallite size and lattice strain by the Williamson-Hall analysis. Considering all the reflections of the anatase phase the lattice strain ranging from c = 9.505 to c = 9.548 is calculated, suggesting that microstrain decreases when calcination temperature increases. N-2 adsorption-desorption analysis shows that the surface area and pore volume decrease with increasing temperature and that WOx-TiO2 powders primarily consist of mesopores. Sintering temperature induced a change in textural properties causing a systematic shift towards larger mesopores. Simultaneously, photoactivity in decolorization of methyl orange increases with increasing calcination temperature up to 700 degrees C, followed by significant decrease with its further increase.
PB  - International Institute for the Science of Sintering, Beograd
T2  - Science of Sintering
T1  - The Effect of Sintering Temperature on Mesoporous Structure of WO3 Doped Tio(2) Powders
VL  - 50
IS  - 1
SP  - 123
EP  - 132
DO  - 10.2298/SOS1801123P
ER  - 

@article{
author = "Petrović, Srđan and Rožić, Ljiljana and Stojadinović, Stevan and Grbić, Boško and Vasilić, Rastko and Vuković, Zorica and Radić, Nenad",
year = "2018",
abstract = "In this study, WO3 doped TiO2 powders were synthesized via sol-gel method combined with a hydrothermal process. The effect of sintering temperature on mesoporous structure and catalytic activities of these powders were investigated. The physical analysis via X-ray diffraction indicates that prepared samples are a mixture of anatase and rutile TiO2 phases. X-ray peak analysis is used to evaluate the crystallite size and lattice strain by the Williamson-Hall analysis. Considering all the reflections of the anatase phase the lattice strain ranging from c = 9.505 to c = 9.548 is calculated, suggesting that microstrain decreases when calcination temperature increases. N-2 adsorption-desorption analysis shows that the surface area and pore volume decrease with increasing temperature and that WOx-TiO2 powders primarily consist of mesopores. Sintering temperature induced a change in textural properties causing a systematic shift towards larger mesopores. Simultaneously, photoactivity in decolorization of methyl orange increases with increasing calcination temperature up to 700 degrees C, followed by significant decrease with its further increase.",
publisher = "International Institute for the Science of Sintering, Beograd",
journal = "Science of Sintering",
title = "The Effect of Sintering Temperature on Mesoporous Structure of WO3 Doped Tio(2) Powders",
volume = "50",
number = "1",
pages = "123-132",
doi = "10.2298/SOS1801123P"
}

Petrović, S., Rožić, L., Stojadinović, S., Grbić, B., Vasilić, R., Vuković, Z.,& Radić, N.. (2018). The Effect of Sintering Temperature on Mesoporous Structure of WO3 Doped Tio(2) Powders. in Science of Sintering
International Institute for the Science of Sintering, Beograd., 50(1), 123-132.
https://doi.org/10.2298/SOS1801123P

Petrović S, Rožić L, Stojadinović S, Grbić B, Vasilić R, Vuković Z, Radić N. The Effect of Sintering Temperature on Mesoporous Structure of WO3 Doped Tio(2) Powders. in Science of Sintering. 2018;50(1):123-132.
doi:10.2298/SOS1801123P .

Petrović, Srđan, Rožić, Ljiljana, Stojadinović, Stevan, Grbić, Boško, Vasilić, Rastko, Vuković, Zorica, Radić, Nenad, "The Effect of Sintering Temperature on Mesoporous Structure of WO3 Doped Tio(2) Powders" in Science of Sintering, 50, no. 1 (2018):123-132,
https://doi.org/10.2298/SOS1801123P . .

TY  - JOUR
AU  - Stojadinović, Stevan
AU  - Tadić, Nenad
AU  - Radić, Nenad
AU  - Grbić, Boško
AU  - Vasilić, Rastko
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2445
AB  - CdS particles modified anatase TiO2 photocatalysts were formed on titanium substrate by plasma electrolytic oxidation for 2 min in supporting electrolyte (10 g/L Na-3 center dot PO4 center dot 12H(2)O) with addition of CdS particles in concentrations up to 8 g/L. Content of CdS particles incorporated into TiO2 coatings depends of CdS particles concentration in supporting electrolyte, while surface morphology, phase structure and absorption properties of formed coatings were not significantly influenced by the addition of CdS particles. In contrast to pure TiO2 coatings, TiO2/CdS coatings exhibit enhanced photocatalytic activity (PA) in the degradation of methyl orange, used as a model organic pollutant, under simulated solar irradiation. The highest PA was observed for TiO2/CdS coating formed in supporting electrolyte with addition of 0.4 g/L of CdS particles. Photoluminescence measurements indicate that enhanced PA is related to the reduction of the recombination rate of photogenerated electron/hole pairs as a result of TiO2 and CdS coupling.
PB  - Elsevier
T2  - Surface and Coatings Technology
T1  - CdS particles modified TiO2 coatings formed by plasma electrolytic oxidation with enhanced photocatalytic activity
VL  - 344
SP  - 528
EP  - 533
DO  - 10.1016/j.surfcoat.2018.03.080
ER  - 

@article{
author = "Stojadinović, Stevan and Tadić, Nenad and Radić, Nenad and Grbić, Boško and Vasilić, Rastko",
year = "2018",
abstract = "CdS particles modified anatase TiO2 photocatalysts were formed on titanium substrate by plasma electrolytic oxidation for 2 min in supporting electrolyte (10 g/L Na-3 center dot PO4 center dot 12H(2)O) with addition of CdS particles in concentrations up to 8 g/L. Content of CdS particles incorporated into TiO2 coatings depends of CdS particles concentration in supporting electrolyte, while surface morphology, phase structure and absorption properties of formed coatings were not significantly influenced by the addition of CdS particles. In contrast to pure TiO2 coatings, TiO2/CdS coatings exhibit enhanced photocatalytic activity (PA) in the degradation of methyl orange, used as a model organic pollutant, under simulated solar irradiation. The highest PA was observed for TiO2/CdS coating formed in supporting electrolyte with addition of 0.4 g/L of CdS particles. Photoluminescence measurements indicate that enhanced PA is related to the reduction of the recombination rate of photogenerated electron/hole pairs as a result of TiO2 and CdS coupling.",
publisher = "Elsevier",
journal = "Surface and Coatings Technology",
title = "CdS particles modified TiO2 coatings formed by plasma electrolytic oxidation with enhanced photocatalytic activity",
volume = "344",
pages = "528-533",
doi = "10.1016/j.surfcoat.2018.03.080"
}

Stojadinović, S., Tadić, N., Radić, N., Grbić, B.,& Vasilić, R.. (2018). CdS particles modified TiO2 coatings formed by plasma electrolytic oxidation with enhanced photocatalytic activity. in Surface and Coatings Technology
Elsevier., 344, 528-533.
https://doi.org/10.1016/j.surfcoat.2018.03.080

Stojadinović S, Tadić N, Radić N, Grbić B, Vasilić R. CdS particles modified TiO2 coatings formed by plasma electrolytic oxidation with enhanced photocatalytic activity. in Surface and Coatings Technology. 2018;344:528-533.
doi:10.1016/j.surfcoat.2018.03.080 .

Stojadinović, Stevan, Tadić, Nenad, Radić, Nenad, Grbić, Boško, Vasilić, Rastko, "CdS particles modified TiO2 coatings formed by plasma electrolytic oxidation with enhanced photocatalytic activity" in Surface and Coatings Technology, 344 (2018):528-533,
https://doi.org/10.1016/j.surfcoat.2018.03.080 . .

TY  - JOUR
AU  - Petrović, Srđan
AU  - Rožić, Ljiljana
AU  - Jović, Vesna
AU  - Stojadinović, Stevan
AU  - Grbić, Boško
AU  - Radić, Nenad
AU  - Lamovec, Jelena
AU  - Vasilić, Rastko
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2454
AB  - Nanocrystalline TiO2-CeO2 powders were synthesized from their TiO2 and CeO2 oxides using mechanical ball milling process. The response surface method is applied to identify optimal parameters for the synthesis of TiO2-CeO2 photocatalyst. Analysis of variance and main effect plot are used to determine the significant parameters and set the optimal level for each parameter. Regression analysis showed good agreement of experimental data with the second-order polynomial model with a coefficients of determination: R-2 = 0.991, R-Adj(2). = 0.940 and R-Pred(2). = 0.983. Under optimal experimental conditions of TiO2:CeO2 weight percentage ratio 71: 29, milling speed 200 rpm, and milling time 115 min the highest photodegradation efficiency was achieved. On the basis of the above statistical analysis, it was found that the band gap energy of TiO2-CeO2 nanoparticles decreases with the increase of the milling speed and milling time with constant TiO2:CeO2 weight percentage ratio. Obtained results suggest that mechanical ball milling process is a rapid, efficient and low energy consumption method to synthesize TiO2-CeO2 photocatalyst.
PB  - Elsevier
T2  - Advanced Powder Technology
T1  - Optimization of a nanoparticle ball milling process parameters using the response surface method
VL  - 29
IS  - 9
SP  - 2129
EP  - 2139
DO  - 10.1016/j.apt.2018.05.021
ER  - 

@article{
author = "Petrović, Srđan and Rožić, Ljiljana and Jović, Vesna and Stojadinović, Stevan and Grbić, Boško and Radić, Nenad and Lamovec, Jelena and Vasilić, Rastko",
year = "2018",
abstract = "Nanocrystalline TiO2-CeO2 powders were synthesized from their TiO2 and CeO2 oxides using mechanical ball milling process. The response surface method is applied to identify optimal parameters for the synthesis of TiO2-CeO2 photocatalyst. Analysis of variance and main effect plot are used to determine the significant parameters and set the optimal level for each parameter. Regression analysis showed good agreement of experimental data with the second-order polynomial model with a coefficients of determination: R-2 = 0.991, R-Adj(2). = 0.940 and R-Pred(2). = 0.983. Under optimal experimental conditions of TiO2:CeO2 weight percentage ratio 71: 29, milling speed 200 rpm, and milling time 115 min the highest photodegradation efficiency was achieved. On the basis of the above statistical analysis, it was found that the band gap energy of TiO2-CeO2 nanoparticles decreases with the increase of the milling speed and milling time with constant TiO2:CeO2 weight percentage ratio. Obtained results suggest that mechanical ball milling process is a rapid, efficient and low energy consumption method to synthesize TiO2-CeO2 photocatalyst.",
publisher = "Elsevier",
journal = "Advanced Powder Technology",
title = "Optimization of a nanoparticle ball milling process parameters using the response surface method",
volume = "29",
number = "9",
pages = "2129-2139",
doi = "10.1016/j.apt.2018.05.021"
}

Petrović, S., Rožić, L., Jović, V., Stojadinović, S., Grbić, B., Radić, N., Lamovec, J.,& Vasilić, R.. (2018). Optimization of a nanoparticle ball milling process parameters using the response surface method. in Advanced Powder Technology
Elsevier., 29(9), 2129-2139.
https://doi.org/10.1016/j.apt.2018.05.021

Petrović S, Rožić L, Jović V, Stojadinović S, Grbić B, Radić N, Lamovec J, Vasilić R. Optimization of a nanoparticle ball milling process parameters using the response surface method. in Advanced Powder Technology. 2018;29(9):2129-2139.
doi:10.1016/j.apt.2018.05.021 .

Petrović, Srđan, Rožić, Ljiljana, Jović, Vesna, Stojadinović, Stevan, Grbić, Boško, Radić, Nenad, Lamovec, Jelena, Vasilić, Rastko, "Optimization of a nanoparticle ball milling process parameters using the response surface method" in Advanced Powder Technology, 29, no. 9 (2018):2129-2139,
https://doi.org/10.1016/j.apt.2018.05.021 . .

TY  - JOUR
AU  - Stojadinović, Stevan
AU  - Tadić, Nenad
AU  - Radić, Nenad
AU  - Grbić, Boško
AU  - Vasilić, Rastko
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4292
AB  - CdS particles modified anatase TiO2 photocatalysts were formed on titanium substrate by plasma electrolytic oxidation for 2 min in supporting electrolyte (10 g/L Na-3 center dot PO4 center dot 12H(2)O) with addition of CdS particles in concentrations up to 8 g/L. Content of CdS particles incorporated into TiO2 coatings depends of CdS particles concentration in supporting electrolyte, while surface morphology, phase structure and absorption properties of formed coatings were not significantly influenced by the addition of CdS particles. In contrast to pure TiO2 coatings, TiO2/CdS coatings exhibit enhanced photocatalytic activity (PA) in the degradation of methyl orange, used as a model organic pollutant, under simulated solar irradiation. The highest PA was observed for TiO2/CdS coating formed in supporting electrolyte with addition of 0.4 g/L of CdS particles. Photoluminescence measurements indicate that enhanced PA is related to the reduction of the recombination rate of photogenerated electron/hole pairs as a result of TiO2 and CdS coupling.
PB  - Elsevier
T2  - Surface and Coatings Technology
T1  - CdS particles modified TiO2 coatings formed by plasma electrolytic oxidation with enhanced photocatalytic activity
VL  - 344
SP  - 528
EP  - 533
DO  - 10.1016/j.surfcoat.2018.03.080
ER  - 

@article{
author = "Stojadinović, Stevan and Tadić, Nenad and Radić, Nenad and Grbić, Boško and Vasilić, Rastko",
year = "2018",
abstract = "CdS particles modified anatase TiO2 photocatalysts were formed on titanium substrate by plasma electrolytic oxidation for 2 min in supporting electrolyte (10 g/L Na-3 center dot PO4 center dot 12H(2)O) with addition of CdS particles in concentrations up to 8 g/L. Content of CdS particles incorporated into TiO2 coatings depends of CdS particles concentration in supporting electrolyte, while surface morphology, phase structure and absorption properties of formed coatings were not significantly influenced by the addition of CdS particles. In contrast to pure TiO2 coatings, TiO2/CdS coatings exhibit enhanced photocatalytic activity (PA) in the degradation of methyl orange, used as a model organic pollutant, under simulated solar irradiation. The highest PA was observed for TiO2/CdS coating formed in supporting electrolyte with addition of 0.4 g/L of CdS particles. Photoluminescence measurements indicate that enhanced PA is related to the reduction of the recombination rate of photogenerated electron/hole pairs as a result of TiO2 and CdS coupling.",
publisher = "Elsevier",
journal = "Surface and Coatings Technology",
title = "CdS particles modified TiO2 coatings formed by plasma electrolytic oxidation with enhanced photocatalytic activity",
volume = "344",
pages = "528-533",
doi = "10.1016/j.surfcoat.2018.03.080"
}

Stojadinović, S., Tadić, N., Radić, N., Grbić, B.,& Vasilić, R.. (2018). CdS particles modified TiO2 coatings formed by plasma electrolytic oxidation with enhanced photocatalytic activity. in Surface and Coatings Technology
Elsevier., 344, 528-533.
https://doi.org/10.1016/j.surfcoat.2018.03.080

Stojadinović S, Tadić N, Radić N, Grbić B, Vasilić R. CdS particles modified TiO2 coatings formed by plasma electrolytic oxidation with enhanced photocatalytic activity. in Surface and Coatings Technology. 2018;344:528-533.
doi:10.1016/j.surfcoat.2018.03.080 .

Stojadinović, Stevan, Tadić, Nenad, Radić, Nenad, Grbić, Boško, Vasilić, Rastko, "CdS particles modified TiO2 coatings formed by plasma electrolytic oxidation with enhanced photocatalytic activity" in Surface and Coatings Technology, 344 (2018):528-533,
https://doi.org/10.1016/j.surfcoat.2018.03.080 . .

TY  - JOUR
AU  - Đeković-Šević, Milica
AU  - Bošković-Vragolović, Nevenka
AU  - Garić Grulović, Radmila
AU  - Pejanović, Srđan
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2326
AB  - This work deals with gas absorption accompanied by chemical reaction in a liquid phase. Ozone absorption in potassium indigotrisulfonate solution was investigated in a batch bubble column. Enhancement factor for absorption accompanied by instantaneous chemical reaction in the liquid phase was experimentally determined, as a ratio of the volumetric mass transfer coefficient for the absorption accompanied by reaction to that for pure physical absorption. The influence of (a) the initial concentration of the solute from liquid phase and (b) the ozone concentration in gas phase on the enhancement factor were experimentally examined. The absorption accompanied by instantaneous chemical reaction is a diffusion-controlled process, whose rate depends upon the diffusivities of the absorbing gas and the solute in liquid phase. The influence of these diffusivities was found to be more significant for lower values of the enhancement factor. The rate of ozone absorption was followed by the time change of the solution color, using new method based on the computer program SigmaScan Pro 5 (Systat Software, Inc., San Jose, CA, USA). This investigation is a contribution to the prediction of the ozone consumption in wastewater treatment, in cases when ozone instantaneously reacts with substances present in water.
PB  - Taylor & Francis
T2  - Chemical Engineering Communications
T1  - Experimental study on the ozone absorption accompanied by instantaneous chemical reaction
VL  - 205
IS  - 5
SP  - 571
EP  - 580
DO  - 10.1080/00986445.2017.1399125
ER  - 

@article{
author = "Đeković-Šević, Milica and Bošković-Vragolović, Nevenka and Garić Grulović, Radmila and Pejanović, Srđan",
year = "2018",
abstract = "This work deals with gas absorption accompanied by chemical reaction in a liquid phase. Ozone absorption in potassium indigotrisulfonate solution was investigated in a batch bubble column. Enhancement factor for absorption accompanied by instantaneous chemical reaction in the liquid phase was experimentally determined, as a ratio of the volumetric mass transfer coefficient for the absorption accompanied by reaction to that for pure physical absorption. The influence of (a) the initial concentration of the solute from liquid phase and (b) the ozone concentration in gas phase on the enhancement factor were experimentally examined. The absorption accompanied by instantaneous chemical reaction is a diffusion-controlled process, whose rate depends upon the diffusivities of the absorbing gas and the solute in liquid phase. The influence of these diffusivities was found to be more significant for lower values of the enhancement factor. The rate of ozone absorption was followed by the time change of the solution color, using new method based on the computer program SigmaScan Pro 5 (Systat Software, Inc., San Jose, CA, USA). This investigation is a contribution to the prediction of the ozone consumption in wastewater treatment, in cases when ozone instantaneously reacts with substances present in water.",
publisher = "Taylor & Francis",
journal = "Chemical Engineering Communications",
title = "Experimental study on the ozone absorption accompanied by instantaneous chemical reaction",
volume = "205",
number = "5",
pages = "571-580",
doi = "10.1080/00986445.2017.1399125"
}

Đeković-Šević, M., Bošković-Vragolović, N., Garić Grulović, R.,& Pejanović, S.. (2018). Experimental study on the ozone absorption accompanied by instantaneous chemical reaction. in Chemical Engineering Communications
Taylor & Francis., 205(5), 571-580.
https://doi.org/10.1080/00986445.2017.1399125

Đeković-Šević M, Bošković-Vragolović N, Garić Grulović R, Pejanović S. Experimental study on the ozone absorption accompanied by instantaneous chemical reaction. in Chemical Engineering Communications. 2018;205(5):571-580.
doi:10.1080/00986445.2017.1399125 .

Đeković-Šević, Milica, Bošković-Vragolović, Nevenka, Garić Grulović, Radmila, Pejanović, Srđan, "Experimental study on the ozone absorption accompanied by instantaneous chemical reaction" in Chemical Engineering Communications, 205, no. 5 (2018):571-580,
https://doi.org/10.1080/00986445.2017.1399125 . .

TY  - JOUR
AU  - Currie, Robert
AU  - Nikolić-Paunić, Daliborka
AU  - Petkovska, Menka
AU  - Simakov, David S. A.
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2446
AB  - Conversion of CO2 into synthetic CH4 via thermocatalytic hydrogenation (the Sabatier reaction), has recently gained increasing interest as a possible route for CO2 utilization and energy storage pathway. Herein, we analyze the possibility of increasing the CO2 conversion through periodic operation of the reactor. The analysis is performed by using the Nonlinear Frequency Response (NFR) method, a recently developed analytical technique, suitable for fast evaluation of periodic reactor operations. The NFR analysis predicts a significant conversion gain (up to 50%) for certain frequencies of the feed flow rate modulation. This prediction is validated by numerical simulations with a reaction rate expression obtained by CO2 conversion experiments using a Ni/Al2O3 catalysts. Both the NFR analysis and numerical simulations predict that it is possible to obtain 70% CO2 conversion at 500 K, 5 bar, and average space velocity of 7600 h(-1) by a periodic modulation of the feed flow rate, as compared to the corresponding steady state CO2 conversion of 43%.
PB  - Wiley
T2  - Israel Journal of Chemistry
T1  - CO2 Conversion Enhancement in a Periodically Operated Sabatier Reactor: Nonlinear Frequency Response Analysis and Simulation-based Study
VL  - 58
IS  - 6-7
SP  - 762
EP  - 775
DO  - 10.1002/ijch.201700134
ER  - 

@article{
author = "Currie, Robert and Nikolić-Paunić, Daliborka and Petkovska, Menka and Simakov, David S. A.",
year = "2018",
abstract = "Conversion of CO2 into synthetic CH4 via thermocatalytic hydrogenation (the Sabatier reaction), has recently gained increasing interest as a possible route for CO2 utilization and energy storage pathway. Herein, we analyze the possibility of increasing the CO2 conversion through periodic operation of the reactor. The analysis is performed by using the Nonlinear Frequency Response (NFR) method, a recently developed analytical technique, suitable for fast evaluation of periodic reactor operations. The NFR analysis predicts a significant conversion gain (up to 50%) for certain frequencies of the feed flow rate modulation. This prediction is validated by numerical simulations with a reaction rate expression obtained by CO2 conversion experiments using a Ni/Al2O3 catalysts. Both the NFR analysis and numerical simulations predict that it is possible to obtain 70% CO2 conversion at 500 K, 5 bar, and average space velocity of 7600 h(-1) by a periodic modulation of the feed flow rate, as compared to the corresponding steady state CO2 conversion of 43%.",
publisher = "Wiley",
journal = "Israel Journal of Chemistry",
title = "CO2 Conversion Enhancement in a Periodically Operated Sabatier Reactor: Nonlinear Frequency Response Analysis and Simulation-based Study",
volume = "58",
number = "6-7",
pages = "762-775",
doi = "10.1002/ijch.201700134"
}

Currie, R., Nikolić-Paunić, D., Petkovska, M.,& Simakov, D. S. A.. (2018). CO2 Conversion Enhancement in a Periodically Operated Sabatier Reactor: Nonlinear Frequency Response Analysis and Simulation-based Study. in Israel Journal of Chemistry
Wiley., 58(6-7), 762-775.
https://doi.org/10.1002/ijch.201700134

Currie R, Nikolić-Paunić D, Petkovska M, Simakov DSA. CO2 Conversion Enhancement in a Periodically Operated Sabatier Reactor: Nonlinear Frequency Response Analysis and Simulation-based Study. in Israel Journal of Chemistry. 2018;58(6-7):762-775.
doi:10.1002/ijch.201700134 .

Currie, Robert, Nikolić-Paunić, Daliborka, Petkovska, Menka, Simakov, David S. A., "CO2 Conversion Enhancement in a Periodically Operated Sabatier Reactor: Nonlinear Frequency Response Analysis and Simulation-based Study" in Israel Journal of Chemistry, 58, no. 6-7 (2018):762-775,
https://doi.org/10.1002/ijch.201700134 . .

TY  - JOUR
AU  - Petkovska, Menka
AU  - Nikolić-Paunić, Daliborka
AU  - Seidel-Morgenstern, Andreas
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2427
AB  - Nonlinear Frequency Response (NFR) method is a relatively new method which can be used for fast evaluation of possible process improvements through periodic operations. The method is analytical and approximate. Its main task is to give an answer whether periodic modulation of one or more process inputs can result in improved process performance. The method is explained in brief and an overview of the existing applications is given. The review covers simple reactions performed in isothermal and non-isothermal stirred tank reactors exposed to different modulated inputs (inlet concentration, flow-rate, inlet temperature, temperature of the heating/cooling medium). Processes with two simultaneously modulated inputs and different shapes of the periodic input are also considered. The results of the NFR method are compared with the results of numerical simulation and a critical evaluation of the method is given.
PB  - Wiley
T2  - Israel Journal of Chemistry
T1  - Nonlinear Frequency Response Method for Evaluating Forced Periodic Operations of Chemical Reactors
VL  - 58
IS  - 6-7
SP  - 663
EP  - 681
DO  - 10.1002/ijch.201700132
ER  - 

@article{
author = "Petkovska, Menka and Nikolić-Paunić, Daliborka and Seidel-Morgenstern, Andreas",
year = "2018",
abstract = "Nonlinear Frequency Response (NFR) method is a relatively new method which can be used for fast evaluation of possible process improvements through periodic operations. The method is analytical and approximate. Its main task is to give an answer whether periodic modulation of one or more process inputs can result in improved process performance. The method is explained in brief and an overview of the existing applications is given. The review covers simple reactions performed in isothermal and non-isothermal stirred tank reactors exposed to different modulated inputs (inlet concentration, flow-rate, inlet temperature, temperature of the heating/cooling medium). Processes with two simultaneously modulated inputs and different shapes of the periodic input are also considered. The results of the NFR method are compared with the results of numerical simulation and a critical evaluation of the method is given.",
publisher = "Wiley",
journal = "Israel Journal of Chemistry",
title = "Nonlinear Frequency Response Method for Evaluating Forced Periodic Operations of Chemical Reactors",
volume = "58",
number = "6-7",
pages = "663-681",
doi = "10.1002/ijch.201700132"
}

Petkovska, M., Nikolić-Paunić, D.,& Seidel-Morgenstern, A.. (2018). Nonlinear Frequency Response Method for Evaluating Forced Periodic Operations of Chemical Reactors. in Israel Journal of Chemistry
Wiley., 58(6-7), 663-681.
https://doi.org/10.1002/ijch.201700132

Petkovska M, Nikolić-Paunić D, Seidel-Morgenstern A. Nonlinear Frequency Response Method for Evaluating Forced Periodic Operations of Chemical Reactors. in Israel Journal of Chemistry. 2018;58(6-7):663-681.
doi:10.1002/ijch.201700132 .

Petkovska, Menka, Nikolić-Paunić, Daliborka, Seidel-Morgenstern, Andreas, "Nonlinear Frequency Response Method for Evaluating Forced Periodic Operations of Chemical Reactors" in Israel Journal of Chemistry, 58, no. 6-7 (2018):663-681,
https://doi.org/10.1002/ijch.201700132 . .

TY  - CONF
AU  - Nikolić, Daliborka
AU  - Felischak, Matthias
AU  - Seidel-Morgenstern, Andreas
AU  - Petkovska, Menka
PY  - 2017
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3814
AB  - Deliberate periodic operations have been recognized as one way of process intensification for several decades. Special attention has been dedicated to possible improvements of chemical reactor performance through periodic modulation of one or more inputs. In our previous investigations we have developed a new, nonlinear frequency response (NFR) method, as a fast and easy analytical method for evaluating the performance of forced periodically operated chemical reactors. The NFR method is based on nonlinear frequency response analysis and the concept of higher order frequency response function (FRFs) [1]. In its essence the method is approximate and it is limited to analysis of stable, weakly nonlinear systems. The method gives an answer whether, and in which cases, it is possible to obtain process improvement through periodic operation. It also gives an approximate quantitative estimate of the improvement. In addition, the method enables choosing the best forcing parameters of the modulated input(s) (frequency, amplitude and, for multiple input modulation, the phase difference between the input waves).
The NFR method was originally developed for sinusoidal forcing function(s) [1]. Recently, it was extended to a general case which is applicable for any shape of the periodic input modulation, by expanding the input function into Fourier series and taking into account only a finite number of harmonics [2]. This opens a new possibility of choosing the best shape of the input wave, as well.
In this paper, the NFR method is used to evaluate the performance of a forced periodically operated adiabatic continuous stirred tank reactor (CSTR) in which an exothermal reaction of hydrolysis of acetic acid anhydride to acetic acid takes place [3]. The analysisis performed for periodic modulations of the acetic anhydride concentration in the feed stream, around a previously established optimal steady state. Different shapes of the input forcing function (sinusoidal, square-wave, triangle, saw-tooth,…) were analyzed, in order to determine the best strategy of performing periodic operation. The acetic acid yield is used as a measure of the reactor performance. The increases of the product yield (relative to the steady-state value) for different shapes of the forcing function are compared. Finally, the best forcing strategy (regarding the shape, frequency and amplitude of the input wave) is chosen to be applied for experimental investigation in a lab-scale adiabatic CSTR.
C3  - 10th World Congress of Chemical Engineering (WCCE10), Barcelona, Spain
T1  - Comparison of possible improvements of a periodically operated adiabatic CSTR with inlet concentration modulation for different shapes of the forcing function
UR  - https://hdl.handle.net/21.15107/rcub_cer_3814
ER  - 

@conference{
author = "Nikolić, Daliborka and Felischak, Matthias and Seidel-Morgenstern, Andreas and Petkovska, Menka",
year = "2017",
abstract = "Deliberate periodic operations have been recognized as one way of process intensification for several decades. Special attention has been dedicated to possible improvements of chemical reactor performance through periodic modulation of one or more inputs. In our previous investigations we have developed a new, nonlinear frequency response (NFR) method, as a fast and easy analytical method for evaluating the performance of forced periodically operated chemical reactors. The NFR method is based on nonlinear frequency response analysis and the concept of higher order frequency response function (FRFs) [1]. In its essence the method is approximate and it is limited to analysis of stable, weakly nonlinear systems. The method gives an answer whether, and in which cases, it is possible to obtain process improvement through periodic operation. It also gives an approximate quantitative estimate of the improvement. In addition, the method enables choosing the best forcing parameters of the modulated input(s) (frequency, amplitude and, for multiple input modulation, the phase difference between the input waves).
The NFR method was originally developed for sinusoidal forcing function(s) [1]. Recently, it was extended to a general case which is applicable for any shape of the periodic input modulation, by expanding the input function into Fourier series and taking into account only a finite number of harmonics [2]. This opens a new possibility of choosing the best shape of the input wave, as well.
In this paper, the NFR method is used to evaluate the performance of a forced periodically operated adiabatic continuous stirred tank reactor (CSTR) in which an exothermal reaction of hydrolysis of acetic acid anhydride to acetic acid takes place [3]. The analysisis performed for periodic modulations of the acetic anhydride concentration in the feed stream, around a previously established optimal steady state. Different shapes of the input forcing function (sinusoidal, square-wave, triangle, saw-tooth,…) were analyzed, in order to determine the best strategy of performing periodic operation. The acetic acid yield is used as a measure of the reactor performance. The increases of the product yield (relative to the steady-state value) for different shapes of the forcing function are compared. Finally, the best forcing strategy (regarding the shape, frequency and amplitude of the input wave) is chosen to be applied for experimental investigation in a lab-scale adiabatic CSTR.",
journal = "10th World Congress of Chemical Engineering (WCCE10), Barcelona, Spain",
title = "Comparison of possible improvements of a periodically operated adiabatic CSTR with inlet concentration modulation for different shapes of the forcing function",
url = "https://hdl.handle.net/21.15107/rcub_cer_3814"
}

Nikolić, D., Felischak, M., Seidel-Morgenstern, A.,& Petkovska, M.. (2017). Comparison of possible improvements of a periodically operated adiabatic CSTR with inlet concentration modulation for different shapes of the forcing function. in 10th World Congress of Chemical Engineering (WCCE10), Barcelona, Spain.
https://hdl.handle.net/21.15107/rcub_cer_3814

Nikolić D, Felischak M, Seidel-Morgenstern A, Petkovska M. Comparison of possible improvements of a periodically operated adiabatic CSTR with inlet concentration modulation for different shapes of the forcing function. in 10th World Congress of Chemical Engineering (WCCE10), Barcelona, Spain. 2017;.
https://hdl.handle.net/21.15107/rcub_cer_3814 .

Nikolić, Daliborka, Felischak, Matthias, Seidel-Morgenstern, Andreas, Petkovska, Menka, "Comparison of possible improvements of a periodically operated adiabatic CSTR with inlet concentration modulation for different shapes of the forcing function" in 10th World Congress of Chemical Engineering (WCCE10), Barcelona, Spain (2017),
https://hdl.handle.net/21.15107/rcub_cer_3814 .