TY  - JOUR
AU  - Miladinović, Marija
AU  - Pavlović, Stefan
AU  - Banković-Ilić, Ivana
AU  - Kostić, Milan
AU  - Stamenković, Olivera
AU  - Veljković, Vlada
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7206
AB  - Possibilities of using waste plum stones in biodiesel production were investigated. The plum kernels were used as a source to obtain oil by the Soxhlet extraction method, while the whole plum stones, the plum stone shells that remained after the crashing, and the plum kernel cake that remained after the oil extraction, were burned off to obtain ashes. The collected ashes were characterized by elemental composition, porosity, and base strength and tested for catalytic activity in transesterification of esterified plum kernel oil. Dominant elements were potassium, calcium, and magnesium at different contents in the three obtained ashes. The most active catalyst was the plum stone shell ash, so the effect of temperature (40, 50, and 60°C) on the reaction rate was investigated. The reaction rate constant increased with the reaction temperature with the activation energy value of 58.8 kJ mol-1. In addition, the plum stone shell ash can be reused as a catalyst after recalcination.
AB  - U ovom radu istraživana je mogućnost korišćenja otpadnih koštica šljive u proizvodnji biodizela. Jezgra  šljive su iskorišćena kao sirovina za dobijanje ulja primenom Soxhlet-ove metode ekstrakcije. Cele  koštice, ljuske koštica šljive i pogača dobijena nakon ekstrakcije ulja iz jezgra šljive spaljeni su da bi se  dobio pepeo, koji je korišćen kao katalizator. Dobijene tri vrste sakupljenog pepela su najpre  okarakterisane u pogledu hemijskog sastava, poroznosti i baznosti, a zatim je testirana katalitička  aktivnost u transesterifikaciji esterifikovanog ulja koštica šljive. Dominantni elementi u pepelu, kao što  su kalijum, kalcijum i magnezijum, imali su različit sadržaj u sve tri vrste pepela. Najveću katalitičku  aktivnost pokazao je pepeo koštica šljive, zbog čega je dalje istraživan uticaj temperature (40, 50 i 60 °C)  na brzinu reakcije katalizovane ovim pepelom. Konstanta brzine reakcije povećavala se sa porastom  temperature reakcije, a vrednost energije aktivacije je 58,8 kJ mol-1 . Pored toga, pepeo koštica šljive  može se ponovo koristiti kao katalizator nakon rekalcinacije.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Utilization of waste plum stones as a source of oil and catalyst for biodiesel production
T1  - Korišćenje otpadnih koštica šljive kao izvora ulja i katalizatora za  proizvodnju biodizela
VL  - 77
IS  - 1
SP  - 39
EP  - 52
DO  - 10.2298/HEMIND221113009M
ER  - 

@article{
author = "Miladinović, Marija and Pavlović, Stefan and Banković-Ilić, Ivana and Kostić, Milan and Stamenković, Olivera and Veljković, Vlada",
year = "2023",
abstract = "Possibilities of using waste plum stones in biodiesel production were investigated. The plum kernels were used as a source to obtain oil by the Soxhlet extraction method, while the whole plum stones, the plum stone shells that remained after the crashing, and the plum kernel cake that remained after the oil extraction, were burned off to obtain ashes. The collected ashes were characterized by elemental composition, porosity, and base strength and tested for catalytic activity in transesterification of esterified plum kernel oil. Dominant elements were potassium, calcium, and magnesium at different contents in the three obtained ashes. The most active catalyst was the plum stone shell ash, so the effect of temperature (40, 50, and 60°C) on the reaction rate was investigated. The reaction rate constant increased with the reaction temperature with the activation energy value of 58.8 kJ mol-1. In addition, the plum stone shell ash can be reused as a catalyst after recalcination., U ovom radu istraživana je mogućnost korišćenja otpadnih koštica šljive u proizvodnji biodizela. Jezgra  šljive su iskorišćena kao sirovina za dobijanje ulja primenom Soxhlet-ove metode ekstrakcije. Cele  koštice, ljuske koštica šljive i pogača dobijena nakon ekstrakcije ulja iz jezgra šljive spaljeni su da bi se  dobio pepeo, koji je korišćen kao katalizator. Dobijene tri vrste sakupljenog pepela su najpre  okarakterisane u pogledu hemijskog sastava, poroznosti i baznosti, a zatim je testirana katalitička  aktivnost u transesterifikaciji esterifikovanog ulja koštica šljive. Dominantni elementi u pepelu, kao što  su kalijum, kalcijum i magnezijum, imali su različit sadržaj u sve tri vrste pepela. Najveću katalitičku  aktivnost pokazao je pepeo koštica šljive, zbog čega je dalje istraživan uticaj temperature (40, 50 i 60 °C)  na brzinu reakcije katalizovane ovim pepelom. Konstanta brzine reakcije povećavala se sa porastom  temperature reakcije, a vrednost energije aktivacije je 58,8 kJ mol-1 . Pored toga, pepeo koštica šljive  može se ponovo koristiti kao katalizator nakon rekalcinacije.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Utilization of waste plum stones as a source of oil and catalyst for biodiesel production, Korišćenje otpadnih koštica šljive kao izvora ulja i katalizatora za  proizvodnju biodizela",
volume = "77",
number = "1",
pages = "39-52",
doi = "10.2298/HEMIND221113009M"
}

Miladinović, M., Pavlović, S., Banković-Ilić, I., Kostić, M., Stamenković, O.,& Veljković, V.. (2023). Utilization of waste plum stones as a source of oil and catalyst for biodiesel production. in Hemijska industrija
Association of Chemical Engineers of Serbia., 77(1), 39-52.
https://doi.org/10.2298/HEMIND221113009M

Miladinović M, Pavlović S, Banković-Ilić I, Kostić M, Stamenković O, Veljković V. Utilization of waste plum stones as a source of oil and catalyst for biodiesel production. in Hemijska industrija. 2023;77(1):39-52.
doi:10.2298/HEMIND221113009M .

Miladinović, Marija, Pavlović, Stefan, Banković-Ilić, Ivana, Kostić, Milan, Stamenković, Olivera, Veljković, Vlada, "Utilization of waste plum stones as a source of oil and catalyst for biodiesel production" in Hemijska industrija, 77, no. 1 (2023):39-52,
https://doi.org/10.2298/HEMIND221113009M . .

TY  - JOUR
AU  - Miladinović, Marija M.
AU  - Krstić, Jugoslav
AU  - Zdujić, Miodrag V.
AU  - Veselinović, Ljiljana M.
AU  - Veljović, Đorđe
AU  - Banković-Ilić, Ivana B.
AU  - Stamenković, Olivera
AU  - Veljković, Vlada B.
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4868
AB  - Hazelnut shell ash was investigated as a new base catalyst for the transesterification of used cooking sunflower oil to biodiesel. To understand its catalytic properties, the prepared ash was characterized by EDX, XRD, TGA/DTA, Hg porosimetry, N2 physisorption, FE-SEM, and basic strength measurements. The effects of the catalyst loading in the range of 1–5% of the oil weight and the methanol-to-oil molar ratio of 6:1–18:1 on the kinetics of the fatty acid methyl esters synthesis were established. Moreover, the leaching and reusability of the catalyst were assessed. The obtained results revealed that hazelnut shell ash was mostly composed of K, Ca, and Mg. The highest ester content (98%) was achieved at the catalyst loading of 5%, the methanol-to-oil molar ratio of 12:1, and the reaction time of 10 min. The contribution of homogeneous catalysis because of the catalyst leaching was confirmed but did not determine the overall reaction rate. The catalyst can be reused after the recalcination at 800 °C for 2 h achieving the high methyl esters content (>96%) in 30 min after three subsequent runs. The overall reaction followed the pseudo-first-order kinetics with respect to triacylglycerols. A linear relationship between the apparent reaction rate constant and the catalyst loading and the methanol-to-oil molar ratio was determined. The determined value of the reaction rate constant was 0.0576 dm6/(min•mol2).
PB  - Elsevier
T2  - Renewable Energy
T1  - Transesterification of used cooking sunflower oil catalyzed by hazelnut shell ash
VL  - 183
SP  - 103
EP  - 113
DO  - 10.1016/j.renene.2021.10.071
ER  - 

@article{
author = "Miladinović, Marija M. and Krstić, Jugoslav and Zdujić, Miodrag V. and Veselinović, Ljiljana M. and Veljović, Đorđe and Banković-Ilić, Ivana B. and Stamenković, Olivera and Veljković, Vlada B.",
year = "2022",
abstract = "Hazelnut shell ash was investigated as a new base catalyst for the transesterification of used cooking sunflower oil to biodiesel. To understand its catalytic properties, the prepared ash was characterized by EDX, XRD, TGA/DTA, Hg porosimetry, N2 physisorption, FE-SEM, and basic strength measurements. The effects of the catalyst loading in the range of 1–5% of the oil weight and the methanol-to-oil molar ratio of 6:1–18:1 on the kinetics of the fatty acid methyl esters synthesis were established. Moreover, the leaching and reusability of the catalyst were assessed. The obtained results revealed that hazelnut shell ash was mostly composed of K, Ca, and Mg. The highest ester content (98%) was achieved at the catalyst loading of 5%, the methanol-to-oil molar ratio of 12:1, and the reaction time of 10 min. The contribution of homogeneous catalysis because of the catalyst leaching was confirmed but did not determine the overall reaction rate. The catalyst can be reused after the recalcination at 800 °C for 2 h achieving the high methyl esters content (>96%) in 30 min after three subsequent runs. The overall reaction followed the pseudo-first-order kinetics with respect to triacylglycerols. A linear relationship between the apparent reaction rate constant and the catalyst loading and the methanol-to-oil molar ratio was determined. The determined value of the reaction rate constant was 0.0576 dm6/(min•mol2).",
publisher = "Elsevier",
journal = "Renewable Energy",
title = "Transesterification of used cooking sunflower oil catalyzed by hazelnut shell ash",
volume = "183",
pages = "103-113",
doi = "10.1016/j.renene.2021.10.071"
}

Miladinović, M. M., Krstić, J., Zdujić, M. V., Veselinović, L. M., Veljović, Đ., Banković-Ilić, I. B., Stamenković, O.,& Veljković, V. B.. (2022). Transesterification of used cooking sunflower oil catalyzed by hazelnut shell ash. in Renewable Energy
Elsevier., 183, 103-113.
https://doi.org/10.1016/j.renene.2021.10.071

Miladinović MM, Krstić J, Zdujić MV, Veselinović LM, Veljović Đ, Banković-Ilić IB, Stamenković O, Veljković VB. Transesterification of used cooking sunflower oil catalyzed by hazelnut shell ash. in Renewable Energy. 2022;183:103-113.
doi:10.1016/j.renene.2021.10.071 .

Miladinović, Marija M., Krstić, Jugoslav, Zdujić, Miodrag V., Veselinović, Ljiljana M., Veljović, Đorđe, Banković-Ilić, Ivana B., Stamenković, Olivera, Veljković, Vlada B., "Transesterification of used cooking sunflower oil catalyzed by hazelnut shell ash" in Renewable Energy, 183 (2022):103-113,
https://doi.org/10.1016/j.renene.2021.10.071 . .