Stamenković, Olivera S.

Link to this page

Authority KeyName Variants
orcid::0000-0002-9981-5845
  • Stamenković, Olivera S. (9)
Projects

Author's Bibliography

Transesterification of used cooking sunflower oil catalyzed by hazelnut shell ash

Miladinović, Marija M.; Krstić, Jugoslav B.; Zdujić, Miodrag V.; Veselinović, Ljiljana M.; Veljović, Đorđe N.; Banković-Ilić, Ivana B.; Stamenković, Olivera S.; Veljković, Vlada B.

(Elsevier, 2022)

TY  - JOUR
AU  - Miladinović, Marija M.
AU  - Krstić, Jugoslav B.
AU  - Zdujić, Miodrag V.
AU  - Veselinović, Ljiljana M.
AU  - Veljović, Đorđe N.
AU  - Banković-Ilić, Ivana B.
AU  - Stamenković, Olivera S.
AU  - Veljković, Vlada B.
PY  - 2022
UR  - https://dais.sanu.ac.rs/123456789/12337
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
SP  - 103
EP  - 113
VL  - 183
DO  - 10.1016/j.renene.2021.10.071
UR  - https://hdl.handle.net/21.15107/rcub_dais_12337
ER  - 
@article{
author = "Miladinović, Marija M. and Krstić, Jugoslav B. and Zdujić, Miodrag V. and Veselinović, Ljiljana M. and Veljović, Đorđe N. and Banković-Ilić, Ivana B. and Stamenković, Olivera S. 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",
pages = "103-113",
volume = "183",
doi = "10.1016/j.renene.2021.10.071",
url = "https://hdl.handle.net/21.15107/rcub_dais_12337"
}
Miladinović, M. M., Krstić, J. B., Zdujić, M. V., Veselinović, L. M., Veljović, Đ. N., Banković-Ilić, I. B., Stamenković, O. S.,& 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
https://hdl.handle.net/21.15107/rcub_dais_12337
Miladinović MM, Krstić JB, Zdujić MV, Veselinović LM, Veljović ĐN, Banković-Ilić IB, Stamenković OS, 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
https://hdl.handle.net/21.15107/rcub_dais_12337 .
Miladinović, Marija M., Krstić, Jugoslav B., Zdujić, Miodrag V., Veselinović, Ljiljana M., Veljović, Đorđe N., Banković-Ilić, Ivana B., Stamenković, Olivera S., 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 .,
https://hdl.handle.net/21.15107/rcub_dais_12337 .
1
1

Valorization of walnut shell ash as a catalyst for biodiesel production

Miladinović, Marija R.; Zdujić, Miodrag; Veljović, Đorđe; Krstić, Jugoslav B.; Banković Ilić, Ivana B.; Veljković, Vlada B.; Stamenković, Olivera S.

(Elsevier, 2020)

TY  - JOUR
AU  - Miladinović, Marija R.
AU  - Zdujić, Miodrag
AU  - Veljović, Đorđe
AU  - Krstić, Jugoslav B.
AU  - Banković Ilić, Ivana B.
AU  - Veljković, Vlada B.
AU  - Stamenković, Olivera S.
PY  - 2020
UR  - https://dais.sanu.ac.rs/123456789/6903
AB  - The catalytic activity of the walnut shell ash was investigated in the biodiesel production by the sunflower oil methanolysis. The catalyst was characterized by the TG-DTA, XRD, Hg porosimetry, N2 physisorption, SEM, and Hammett method. In addition, the effects of the catalyst loading and the methanol-to-oil molar ratio on the methyl esters synthesis were tested at the reaction temperature of 60 °C. The walnut shell ash provided a very fast reaction and a high FAME content (over 98%). As the reaction occurred in the absence of triacylglycerols mass transfer limitation, the pseudo-first-order model was employed for describing the kinetics of the reaction. The catalyst was successfully reused four times after the regeneration of the catalytic activity by recalcination at 800 °C.
PB  - Elsevier
T2  - Renewable Energy
T1  - Valorization of walnut shell ash as a catalyst for biodiesel production
SP  - 1033
EP  - 1043
VL  - 147
DO  - 10.1016/j.renene.2019.09.056
UR  - https://hdl.handle.net/21.15107/rcub_dais_6903
ER  - 
@article{
author = "Miladinović, Marija R. and Zdujić, Miodrag and Veljović, Đorđe and Krstić, Jugoslav B. and Banković Ilić, Ivana B. and Veljković, Vlada B. and Stamenković, Olivera S.",
year = "2020",
abstract = "The catalytic activity of the walnut shell ash was investigated in the biodiesel production by the sunflower oil methanolysis. The catalyst was characterized by the TG-DTA, XRD, Hg porosimetry, N2 physisorption, SEM, and Hammett method. In addition, the effects of the catalyst loading and the methanol-to-oil molar ratio on the methyl esters synthesis were tested at the reaction temperature of 60 °C. The walnut shell ash provided a very fast reaction and a high FAME content (over 98%). As the reaction occurred in the absence of triacylglycerols mass transfer limitation, the pseudo-first-order model was employed for describing the kinetics of the reaction. The catalyst was successfully reused four times after the regeneration of the catalytic activity by recalcination at 800 °C.",
publisher = "Elsevier",
journal = "Renewable Energy",
title = "Valorization of walnut shell ash as a catalyst for biodiesel production",
pages = "1033-1043",
volume = "147",
doi = "10.1016/j.renene.2019.09.056",
url = "https://hdl.handle.net/21.15107/rcub_dais_6903"
}
Miladinović, M. R., Zdujić, M., Veljović, Đ., Krstić, J. B., Banković Ilić, I. B., Veljković, V. B.,& Stamenković, O. S.. (2020). Valorization of walnut shell ash as a catalyst for biodiesel production. in Renewable Energy
Elsevier., 147, 1033-1043.
https://doi.org/10.1016/j.renene.2019.09.056
https://hdl.handle.net/21.15107/rcub_dais_6903
Miladinović MR, Zdujić M, Veljović Đ, Krstić JB, Banković Ilić IB, Veljković VB, Stamenković OS. Valorization of walnut shell ash as a catalyst for biodiesel production. in Renewable Energy. 2020;147:1033-1043.
doi:10.1016/j.renene.2019.09.056
https://hdl.handle.net/21.15107/rcub_dais_6903 .
Miladinović, Marija R., Zdujić, Miodrag, Veljović, Đorđe, Krstić, Jugoslav B., Banković Ilić, Ivana B., Veljković, Vlada B., Stamenković, Olivera S., "Valorization of walnut shell ash as a catalyst for biodiesel production" in Renewable Energy, 147 (2020):1033-1043,
https://doi.org/10.1016/j.renene.2019.09.056 .,
https://hdl.handle.net/21.15107/rcub_dais_6903 .
43
31
48

Valorization of walnut shell ash as a catalyst for biodiesel production

Miladinović, Marija R.; Zdujić, Miodrag; Veljović, Đorđe; Krstić, Jugoslav B.; Banković Ilić, Ivana B.; Veljković, Vlada B.; Stamenković, Olivera S.

(Elsevier, 2020)

TY  - JOUR
AU  - Miladinović, Marija R.
AU  - Zdujić, Miodrag
AU  - Veljović, Đorđe
AU  - Krstić, Jugoslav B.
AU  - Banković Ilić, Ivana B.
AU  - Veljković, Vlada B.
AU  - Stamenković, Olivera S.
PY  - 2020
UR  - http://cer.ihtm.bg.ac.rs/handle/123456789/3217
UR  - https://dais.sanu.ac.rs/123456789/6717
AB  - The catalytic activity of the walnut shell ash was investigated in the biodiesel production by the sunflower oil methanolysis. The catalyst was characterized by the TG-DTA, XRD, Hg porosimetry, N2 physisorption, SEM, and Hammett method. In addition, the effects of the catalyst loading and the methanol-to-oil molar ratio on the methyl esters synthesis were tested at the reaction temperature of 60 °C. The walnut shell ash provided a very fast reaction and a high FAME content (over 98%). As the reaction occurred in the absence of triacylglycerols mass transfer limitation, the pseudo-first-order model was employed for describing the kinetics of the reaction. The catalyst was successfully reused four times after the regeneration of the catalytic activity by recalcination at 800 °C.
PB  - Elsevier
T2  - Renewable Energy
T1  - Valorization of walnut shell ash as a catalyst for biodiesel production
SP  - 1033
EP  - 1043
VL  - 147
DO  - 10.1016/j.renene.2019.09.056
UR  - https://hdl.handle.net/21.15107/rcub_dais_6717
ER  - 
@article{
author = "Miladinović, Marija R. and Zdujić, Miodrag and Veljović, Đorđe and Krstić, Jugoslav B. and Banković Ilić, Ivana B. and Veljković, Vlada B. and Stamenković, Olivera S.",
year = "2020",
abstract = "The catalytic activity of the walnut shell ash was investigated in the biodiesel production by the sunflower oil methanolysis. The catalyst was characterized by the TG-DTA, XRD, Hg porosimetry, N2 physisorption, SEM, and Hammett method. In addition, the effects of the catalyst loading and the methanol-to-oil molar ratio on the methyl esters synthesis were tested at the reaction temperature of 60 °C. The walnut shell ash provided a very fast reaction and a high FAME content (over 98%). As the reaction occurred in the absence of triacylglycerols mass transfer limitation, the pseudo-first-order model was employed for describing the kinetics of the reaction. The catalyst was successfully reused four times after the regeneration of the catalytic activity by recalcination at 800 °C.",
publisher = "Elsevier",
journal = "Renewable Energy",
title = "Valorization of walnut shell ash as a catalyst for biodiesel production",
pages = "1033-1043",
volume = "147",
doi = "10.1016/j.renene.2019.09.056",
url = "https://hdl.handle.net/21.15107/rcub_dais_6717"
}
Miladinović, M. R., Zdujić, M., Veljović, Đ., Krstić, J. B., Banković Ilić, I. B., Veljković, V. B.,& Stamenković, O. S.. (2020). Valorization of walnut shell ash as a catalyst for biodiesel production. in Renewable Energy
Elsevier., 147, 1033-1043.
https://doi.org/10.1016/j.renene.2019.09.056
https://hdl.handle.net/21.15107/rcub_dais_6717
Miladinović MR, Zdujić M, Veljović Đ, Krstić JB, Banković Ilić IB, Veljković VB, Stamenković OS. Valorization of walnut shell ash as a catalyst for biodiesel production. in Renewable Energy. 2020;147:1033-1043.
doi:10.1016/j.renene.2019.09.056
https://hdl.handle.net/21.15107/rcub_dais_6717 .
Miladinović, Marija R., Zdujić, Miodrag, Veljović, Đorđe, Krstić, Jugoslav B., Banković Ilić, Ivana B., Veljković, Vlada B., Stamenković, Olivera S., "Valorization of walnut shell ash as a catalyst for biodiesel production" in Renewable Energy, 147 (2020):1033-1043,
https://doi.org/10.1016/j.renene.2019.09.056 .,
https://hdl.handle.net/21.15107/rcub_dais_6717 .
43
31
47

Supplementary material to Triethanolamine as an efficient cosolvent for biodiesel production by CaO-catalyzed sunflower oil ethanolysis: An optimization study

Đokić-Stojanović, Dušica R.; Todorović, Zoran B.; Troter, Dragan Z.; Stamenković, Olivera S.; Veselinović, Ljiljana; Zdujić, Miodrag; Manojlović, Dragan D.; Veljković, Vlada B.

(2019)

TY  - DATA
AU  - Đokić-Stojanović, Dušica R.
AU  - Todorović, Zoran B.
AU  - Troter, Dragan Z.
AU  - Stamenković, Olivera S.
AU  - Veselinović, Ljiljana
AU  - Zdujić, Miodrag
AU  - Manojlović, Dragan D.
AU  - Veljković, Vlada B.
PY  - 2019
UR  - https://www.ache-pub.org.rs/index.php/HemInd/article/view/587/pdf_1
UR  - https://dais.sanu.ac.rs/123456789/7043
AB  - Figure D1. Normal probability plot of residuals (a), Cook's distances (b) and predicted and actual values of FAEE content (c); Table D1. Results of sequential model sum of squares test; Table D2. Results of lack of fit test; Table D3. Results of model summary statistics test
T2  - Hemijska industrija
T1  - Supplementary material to Triethanolamine as an efficient cosolvent for biodiesel production by CaO-catalyzed sunflower oil ethanolysis: An optimization study
SP  - D17
EP  - D18
VL  - 73
IS  - 6
UR  - https://hdl.handle.net/21.15107/rcub_dais_7043
ER  - 
@misc{
author = "Đokić-Stojanović, Dušica R. and Todorović, Zoran B. and Troter, Dragan Z. and Stamenković, Olivera S. and Veselinović, Ljiljana and Zdujić, Miodrag and Manojlović, Dragan D. and Veljković, Vlada B.",
year = "2019",
abstract = "Figure D1. Normal probability plot of residuals (a), Cook's distances (b) and predicted and actual values of FAEE content (c); Table D1. Results of sequential model sum of squares test; Table D2. Results of lack of fit test; Table D3. Results of model summary statistics test",
journal = "Hemijska industrija",
title = "Supplementary material to Triethanolamine as an efficient cosolvent for biodiesel production by CaO-catalyzed sunflower oil ethanolysis: An optimization study",
pages = "D17-D18",
volume = "73",
number = "6",
url = "https://hdl.handle.net/21.15107/rcub_dais_7043"
}
Đokić-Stojanović, D. R., Todorović, Z. B., Troter, D. Z., Stamenković, O. S., Veselinović, L., Zdujić, M., Manojlović, D. D.,& Veljković, V. B.. (2019). Supplementary material to Triethanolamine as an efficient cosolvent for biodiesel production by CaO-catalyzed sunflower oil ethanolysis: An optimization study. in Hemijska industrija, 73(6), D17-D18.
https://hdl.handle.net/21.15107/rcub_dais_7043
Đokić-Stojanović DR, Todorović ZB, Troter DZ, Stamenković OS, Veselinović L, Zdujić M, Manojlović DD, Veljković VB. Supplementary material to Triethanolamine as an efficient cosolvent for biodiesel production by CaO-catalyzed sunflower oil ethanolysis: An optimization study. in Hemijska industrija. 2019;73(6):D17-D18.
https://hdl.handle.net/21.15107/rcub_dais_7043 .
Đokić-Stojanović, Dušica R., Todorović, Zoran B., Troter, Dragan Z., Stamenković, Olivera S., Veselinović, Ljiljana, Zdujić, Miodrag, Manojlović, Dragan D., Veljković, Vlada B., "Supplementary material to Triethanolamine as an efficient cosolvent for biodiesel production by CaO-catalyzed sunflower oil ethanolysis: An optimization study" in Hemijska industrija, 73, no. 6 (2019):D17-D18,
https://hdl.handle.net/21.15107/rcub_dais_7043 .

Supplementary data for the article: Todorović, Zoran B., Dragan Z. Troter, Dušica R. Đokić-Stojanović, Ana V. Veličković, Jelena M. Avramović, Olivera S. Stamenković, Ljiljana M. Veselinović, and Vlada B. Veljković. 2019. “Optimization of CaO-Catalyzed Sunflower Oil Methanolysis with Crude Biodiesel as a Cosolvent.” Fuel 237 (February): 903–10. https://doi.org/10.1016/j.fuel.2018.10.056

Todorović, Zoran B.; Troter, Dragan Z.; Đokić-Stojanović, Dušica R.; Veličković, Ana V.; Avramović, Jelena M.; Stamenković, Olivera S.; Veselinović, Ljiljana; Veljković, Vlada B.

(2019)

TY  - DATA
AU  - Todorović, Zoran B.
AU  - Troter, Dragan Z.
AU  - Đokić-Stojanović, Dušica R.
AU  - Veličković, Ana V.
AU  - Avramović, Jelena M.
AU  - Stamenković, Olivera S.
AU  - Veselinović, Ljiljana
AU  - Veljković, Vlada B.
PY  - 2019
UR  - https://dais.sanu.ac.rs/123456789/4071
AB  - Figure S1. Variation of FAME content during the sunflower oil methanolysis with CaO as a 
catalyst and crude biodiesel as a cosolvent; Figure S2. XRD patterns of the calcined CaO used as a catalyst in combination with different 
amounts of crude biodiesel as a cosolvent. XRD pattern of the calcined CaO not used in the 
reaction was also provided for comparison.
T2  - Fuel
T1  - Supplementary data for the article: Todorović, Zoran B., Dragan Z. Troter, Dušica R. Đokić-Stojanović, Ana V. Veličković, Jelena M. Avramović, Olivera S. Stamenković, Ljiljana M. Veselinović, and Vlada B. Veljković. 2019. “Optimization of CaO-Catalyzed Sunflower Oil Methanolysis with Crude Biodiesel as a Cosolvent.” Fuel 237 (February): 903–10. https://doi.org/10.1016/j.fuel.2018.10.056
UR  - https://hdl.handle.net/21.15107/rcub_dais_4071
ER  - 
@misc{
author = "Todorović, Zoran B. and Troter, Dragan Z. and Đokić-Stojanović, Dušica R. and Veličković, Ana V. and Avramović, Jelena M. and Stamenković, Olivera S. and Veselinović, Ljiljana and Veljković, Vlada B.",
year = "2019",
abstract = "Figure S1. Variation of FAME content during the sunflower oil methanolysis with CaO as a 
catalyst and crude biodiesel as a cosolvent; Figure S2. XRD patterns of the calcined CaO used as a catalyst in combination with different 
amounts of crude biodiesel as a cosolvent. XRD pattern of the calcined CaO not used in the 
reaction was also provided for comparison.",
journal = "Fuel",
title = "Supplementary data for the article: Todorović, Zoran B., Dragan Z. Troter, Dušica R. Đokić-Stojanović, Ana V. Veličković, Jelena M. Avramović, Olivera S. Stamenković, Ljiljana M. Veselinović, and Vlada B. Veljković. 2019. “Optimization of CaO-Catalyzed Sunflower Oil Methanolysis with Crude Biodiesel as a Cosolvent.” Fuel 237 (February): 903–10. https://doi.org/10.1016/j.fuel.2018.10.056",
url = "https://hdl.handle.net/21.15107/rcub_dais_4071"
}
Todorović, Z. B., Troter, D. Z., Đokić-Stojanović, D. R., Veličković, A. V., Avramović, J. M., Stamenković, O. S., Veselinović, L.,& Veljković, V. B.. (2019). Supplementary data for the article: Todorović, Zoran B., Dragan Z. Troter, Dušica R. Đokić-Stojanović, Ana V. Veličković, Jelena M. Avramović, Olivera S. Stamenković, Ljiljana M. Veselinović, and Vlada B. Veljković. 2019. “Optimization of CaO-Catalyzed Sunflower Oil Methanolysis with Crude Biodiesel as a Cosolvent.” Fuel 237 (February): 903–10. https://doi.org/10.1016/j.fuel.2018.10.056. in Fuel.
https://hdl.handle.net/21.15107/rcub_dais_4071
Todorović ZB, Troter DZ, Đokić-Stojanović DR, Veličković AV, Avramović JM, Stamenković OS, Veselinović L, Veljković VB. Supplementary data for the article: Todorović, Zoran B., Dragan Z. Troter, Dušica R. Đokić-Stojanović, Ana V. Veličković, Jelena M. Avramović, Olivera S. Stamenković, Ljiljana M. Veselinović, and Vlada B. Veljković. 2019. “Optimization of CaO-Catalyzed Sunflower Oil Methanolysis with Crude Biodiesel as a Cosolvent.” Fuel 237 (February): 903–10. https://doi.org/10.1016/j.fuel.2018.10.056. in Fuel. 2019;.
https://hdl.handle.net/21.15107/rcub_dais_4071 .
Todorović, Zoran B., Troter, Dragan Z., Đokić-Stojanović, Dušica R., Veličković, Ana V., Avramović, Jelena M., Stamenković, Olivera S., Veselinović, Ljiljana, Veljković, Vlada B., "Supplementary data for the article: Todorović, Zoran B., Dragan Z. Troter, Dušica R. Đokić-Stojanović, Ana V. Veličković, Jelena M. Avramović, Olivera S. Stamenković, Ljiljana M. Veselinović, and Vlada B. Veljković. 2019. “Optimization of CaO-Catalyzed Sunflower Oil Methanolysis with Crude Biodiesel as a Cosolvent.” Fuel 237 (February): 903–10. https://doi.org/10.1016/j.fuel.2018.10.056" in Fuel (2019),
https://hdl.handle.net/21.15107/rcub_dais_4071 .

Triethanolamine as an efficient cosolvent for biodiesel production by CaO-catalyzed sunflower oil ethanolysis: An optimization study

Đokić-Stojanović, Dušica R.; Todorović, Zoran B.; Troter, Dragan Z.; Stamenković, Olivera S.; Veselinović, Ljiljana; Zdujić, Miodrag; Manojlović, Dragan D.; Veljković, Vlada B.

(2019)

TY  - JOUR
AU  - Đokić-Stojanović, Dušica R.
AU  - Todorović, Zoran B.
AU  - Troter, Dragan Z.
AU  - Stamenković, Olivera S.
AU  - Veselinović, Ljiljana
AU  - Zdujić, Miodrag
AU  - Manojlović, Dragan D.
AU  - Veljković, Vlada B.
PY  - 2019
UR  - https://dais.sanu.ac.rs/123456789/7041
AB  - Triethanolamine was applied as an efficient „green“ cosolvent for biodiesel production by CaO-catalyzed ethanolysis of sunflower oil. The reaction was conducted in a batch stirred reactor and optimized with respect to the reaction temperature (61.6-78.4 °C), the ethanol-to-oil molar ratio (7:1-17:1) and the cosolvent loading (3-36 % of the oil weight) by using a rotatable central composite design (RCCD) combined with the response surface methodology (RSM). The optimal reaction conditions were found to be: the ethanol-to-oil molar ratio of 9:1, the reaction temperature of 75 °C and the cosolvent loading of 30 % to oil weight, which resulted in the predicted and actual fatty acid ethyl ester (FAEE) contents of 98.8 % and 97.9±1.3 %, respectively, achieved within only 20 min of the reaction. Also, high FAEE contents were obtained with expired sunflower oil, hempseed oil and waste lard. X-ray diffraction analysis (XRD) was used to understand the changes in the CaO phase. The CaO catalyst can be used without any treatment in two consecutive cycles. Due to the calcium leaching into the product, an additional purification stage must be included in the overall process.
T2  - Hemijska industrija
T1  - Triethanolamine as an efficient cosolvent for biodiesel production by CaO-catalyzed sunflower oil ethanolysis: An optimization study
SP  - 351
EP  - 362
VL  - 73
IS  - 6
DO  - 10.2298/HEMIND190822033D
UR  - https://hdl.handle.net/21.15107/rcub_dais_7041
ER  - 
@article{
author = "Đokić-Stojanović, Dušica R. and Todorović, Zoran B. and Troter, Dragan Z. and Stamenković, Olivera S. and Veselinović, Ljiljana and Zdujić, Miodrag and Manojlović, Dragan D. and Veljković, Vlada B.",
year = "2019",
abstract = "Triethanolamine was applied as an efficient „green“ cosolvent for biodiesel production by CaO-catalyzed ethanolysis of sunflower oil. The reaction was conducted in a batch stirred reactor and optimized with respect to the reaction temperature (61.6-78.4 °C), the ethanol-to-oil molar ratio (7:1-17:1) and the cosolvent loading (3-36 % of the oil weight) by using a rotatable central composite design (RCCD) combined with the response surface methodology (RSM). The optimal reaction conditions were found to be: the ethanol-to-oil molar ratio of 9:1, the reaction temperature of 75 °C and the cosolvent loading of 30 % to oil weight, which resulted in the predicted and actual fatty acid ethyl ester (FAEE) contents of 98.8 % and 97.9±1.3 %, respectively, achieved within only 20 min of the reaction. Also, high FAEE contents were obtained with expired sunflower oil, hempseed oil and waste lard. X-ray diffraction analysis (XRD) was used to understand the changes in the CaO phase. The CaO catalyst can be used without any treatment in two consecutive cycles. Due to the calcium leaching into the product, an additional purification stage must be included in the overall process.",
journal = "Hemijska industrija",
title = "Triethanolamine as an efficient cosolvent for biodiesel production by CaO-catalyzed sunflower oil ethanolysis: An optimization study",
pages = "351-362",
volume = "73",
number = "6",
doi = "10.2298/HEMIND190822033D",
url = "https://hdl.handle.net/21.15107/rcub_dais_7041"
}
Đokić-Stojanović, D. R., Todorović, Z. B., Troter, D. Z., Stamenković, O. S., Veselinović, L., Zdujić, M., Manojlović, D. D.,& Veljković, V. B.. (2019). Triethanolamine as an efficient cosolvent for biodiesel production by CaO-catalyzed sunflower oil ethanolysis: An optimization study. in Hemijska industrija, 73(6), 351-362.
https://doi.org/10.2298/HEMIND190822033D
https://hdl.handle.net/21.15107/rcub_dais_7041
Đokić-Stojanović DR, Todorović ZB, Troter DZ, Stamenković OS, Veselinović L, Zdujić M, Manojlović DD, Veljković VB. Triethanolamine as an efficient cosolvent for biodiesel production by CaO-catalyzed sunflower oil ethanolysis: An optimization study. in Hemijska industrija. 2019;73(6):351-362.
doi:10.2298/HEMIND190822033D
https://hdl.handle.net/21.15107/rcub_dais_7041 .
Đokić-Stojanović, Dušica R., Todorović, Zoran B., Troter, Dragan Z., Stamenković, Olivera S., Veselinović, Ljiljana, Zdujić, Miodrag, Manojlović, Dragan D., Veljković, Vlada B., "Triethanolamine as an efficient cosolvent for biodiesel production by CaO-catalyzed sunflower oil ethanolysis: An optimization study" in Hemijska industrija, 73, no. 6 (2019):351-362,
https://doi.org/10.2298/HEMIND190822033D .,
https://hdl.handle.net/21.15107/rcub_dais_7041 .
2
2
2

Influence of various cosolvents on the calcium oxide-catalyzed ethanolysis of sunflower oil

Đokić Stojanović, Dušica R.; Todorović, Zoran B.; Troter, Dragan; Stamenković, Olivera S.; Veselinović, Ljiljana; Zdujić, Miodrag; Manojlović, Dragan D.; Veljković, Vlada B.

(Belgrade : Serbian Chemical Society, 2019)

TY  - JOUR
AU  - Đokić Stojanović, Dušica R.
AU  - Todorović, Zoran B.
AU  - Troter, Dragan
AU  - Stamenković, Olivera S.
AU  - Veselinović, Ljiljana
AU  - Zdujić, Miodrag
AU  - Manojlović, Dragan D.
AU  - Veljković, Vlada B.
PY  - 2019
UR  - https://dais.sanu.ac.rs/123456789/6183
AB  - Ten organic solvents (triethanolamine, diethanolamine, ethylene glycol, methyl ethyl ketone, n-hexane, triethylamine, ethylene glycol dimethyl ether, glycerol, tetrahydrofuran and dioxane) were applied as cosolvents in the CaO-catalyzed ethanolysis of sunflower oil performed in a batch stirred reactor under the following reaction conditions: temperature 70 °C, ethanol-to-oil mole ratio 12:1, initial catalyst concentration 1.374 mol·L -1 and amount of cosolvent 20 % based on the oil amount. The main goals were to assess the effect of the used cosolvents on the synthesis of fatty acid ethyl esters (FAEE) and to select the most efficient one with respect to the final FAEE content, reaction duration and safety profile. In the absence of any cosolvent, the reaction was rather slow, providing a FAEE content of only 89.7±1.7 % after 4 h. Of the tested cosolvents, diethanolamine, triethanolamine and ethylene glycol significantly accelerated the ethanolysis reaction, whereby the last two provided a final FAEE content of 93.1±2.1 and 94.1±1.5 %, respectively, within 0.5 h. However, because of its safety profile, triethanolamine was selected as the best cosolvent for the ethanolysis of sunflower oil catalyzed by calcined CaO.
PB  - Belgrade : Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Influence of various cosolvents on the calcium oxide-catalyzed ethanolysis of sunflower oil
SP  - 253
EP  - 265
VL  - 84
IS  - 3
DO  - 10.2298/JSC180827007D
UR  - https://hdl.handle.net/21.15107/rcub_dais_6183
ER  - 
@article{
author = "Đokić Stojanović, Dušica R. and Todorović, Zoran B. and Troter, Dragan and Stamenković, Olivera S. and Veselinović, Ljiljana and Zdujić, Miodrag and Manojlović, Dragan D. and Veljković, Vlada B.",
year = "2019",
abstract = "Ten organic solvents (triethanolamine, diethanolamine, ethylene glycol, methyl ethyl ketone, n-hexane, triethylamine, ethylene glycol dimethyl ether, glycerol, tetrahydrofuran and dioxane) were applied as cosolvents in the CaO-catalyzed ethanolysis of sunflower oil performed in a batch stirred reactor under the following reaction conditions: temperature 70 °C, ethanol-to-oil mole ratio 12:1, initial catalyst concentration 1.374 mol·L -1 and amount of cosolvent 20 % based on the oil amount. The main goals were to assess the effect of the used cosolvents on the synthesis of fatty acid ethyl esters (FAEE) and to select the most efficient one with respect to the final FAEE content, reaction duration and safety profile. In the absence of any cosolvent, the reaction was rather slow, providing a FAEE content of only 89.7±1.7 % after 4 h. Of the tested cosolvents, diethanolamine, triethanolamine and ethylene glycol significantly accelerated the ethanolysis reaction, whereby the last two provided a final FAEE content of 93.1±2.1 and 94.1±1.5 %, respectively, within 0.5 h. However, because of its safety profile, triethanolamine was selected as the best cosolvent for the ethanolysis of sunflower oil catalyzed by calcined CaO.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Influence of various cosolvents on the calcium oxide-catalyzed ethanolysis of sunflower oil",
pages = "253-265",
volume = "84",
number = "3",
doi = "10.2298/JSC180827007D",
url = "https://hdl.handle.net/21.15107/rcub_dais_6183"
}
Đokić Stojanović, D. R., Todorović, Z. B., Troter, D., Stamenković, O. S., Veselinović, L., Zdujić, M., Manojlović, D. D.,& Veljković, V. B.. (2019). Influence of various cosolvents on the calcium oxide-catalyzed ethanolysis of sunflower oil. in Journal of the Serbian Chemical Society
Belgrade : Serbian Chemical Society., 84(3), 253-265.
https://doi.org/10.2298/JSC180827007D
https://hdl.handle.net/21.15107/rcub_dais_6183
Đokić Stojanović DR, Todorović ZB, Troter D, Stamenković OS, Veselinović L, Zdujić M, Manojlović DD, Veljković VB. Influence of various cosolvents on the calcium oxide-catalyzed ethanolysis of sunflower oil. in Journal of the Serbian Chemical Society. 2019;84(3):253-265.
doi:10.2298/JSC180827007D
https://hdl.handle.net/21.15107/rcub_dais_6183 .
Đokić Stojanović, Dušica R., Todorović, Zoran B., Troter, Dragan, Stamenković, Olivera S., Veselinović, Ljiljana, Zdujić, Miodrag, Manojlović, Dragan D., Veljković, Vlada B., "Influence of various cosolvents on the calcium oxide-catalyzed ethanolysis of sunflower oil" in Journal of the Serbian Chemical Society, 84, no. 3 (2019):253-265,
https://doi.org/10.2298/JSC180827007D .,
https://hdl.handle.net/21.15107/rcub_dais_6183 .
1
2
2

Optimization of CaO-catalyzed sunflower oil methanolysis with crude biodiesel as a cosolvent

Todorović, Zoran B.; Troter, Dragan Z.; Đokić-Stojanović, Dušica R.; Veličković, Ana V.; Avramović, Jelena M.; Stamenković, Olivera S.; Veselinović, Ljiljana; Veljković, Vlada B.

(Elsevier, 2019)

TY  - JOUR
AU  - Todorović, Zoran B.
AU  - Troter, Dragan Z.
AU  - Đokić-Stojanović, Dušica R.
AU  - Veličković, Ana V.
AU  - Avramović, Jelena M.
AU  - Stamenković, Olivera S.
AU  - Veselinović, Ljiljana
AU  - Veljković, Vlada B.
PY  - 2019
UR  - http://www.sciencedirect.com/science/article/pii/S0016236118317691
UR  - https://dais.sanu.ac.rs/123456789/4070
AB  - Crude biodiesel was proven as a cosolvent in the methanolysis of sunflower oil catalyzed by calcined CaO. This reaction was modeled and optimized statistically in terms of reaction temperature (33.2–66.8 °C), methanol-to-oil molar ratio (3.5:1–8.5:1) and catalyst concentration (0.219–1.065 mol/L). The cosolvent loading was 10 wt% (based on oil weight). The optimum reaction conditions were found to be: the methanol-to-oil molar ratio of 7.1:1, the catalyst concentration of 0.74 mol/L and the reaction temperature 52 °C, ensuring the best esters content of 99.8%, for the reaction time of 1.5 h, which is close to the reported experimental value of 98.9%. Also, the used catalyst was recycled with no additional treatment in the further four consecutive cycles under the following reaction conditions: methanol-to-oil molar ratio 6:1, the concentration of catalyst 0.642 mol/L (only in the first run), the reaction temperature 50 °C, cosolvent-crude biodiesel loading 10 wt% to oil weight. The second recycling reaction provided the highest FAME content of 97.7% after 5 h.
PB  - Elsevier
T2  - Fuel
T1  - Optimization of CaO-catalyzed sunflower oil methanolysis with crude biodiesel as a cosolvent
SP  - 903
EP  - 910
VL  - 237
DO  - 10.1016/j.fuel.2018.10.056
UR  - https://hdl.handle.net/21.15107/rcub_dais_4070
ER  - 
@article{
author = "Todorović, Zoran B. and Troter, Dragan Z. and Đokić-Stojanović, Dušica R. and Veličković, Ana V. and Avramović, Jelena M. and Stamenković, Olivera S. and Veselinović, Ljiljana and Veljković, Vlada B.",
year = "2019",
abstract = "Crude biodiesel was proven as a cosolvent in the methanolysis of sunflower oil catalyzed by calcined CaO. This reaction was modeled and optimized statistically in terms of reaction temperature (33.2–66.8 °C), methanol-to-oil molar ratio (3.5:1–8.5:1) and catalyst concentration (0.219–1.065 mol/L). The cosolvent loading was 10 wt% (based on oil weight). The optimum reaction conditions were found to be: the methanol-to-oil molar ratio of 7.1:1, the catalyst concentration of 0.74 mol/L and the reaction temperature 52 °C, ensuring the best esters content of 99.8%, for the reaction time of 1.5 h, which is close to the reported experimental value of 98.9%. Also, the used catalyst was recycled with no additional treatment in the further four consecutive cycles under the following reaction conditions: methanol-to-oil molar ratio 6:1, the concentration of catalyst 0.642 mol/L (only in the first run), the reaction temperature 50 °C, cosolvent-crude biodiesel loading 10 wt% to oil weight. The second recycling reaction provided the highest FAME content of 97.7% after 5 h.",
publisher = "Elsevier",
journal = "Fuel",
title = "Optimization of CaO-catalyzed sunflower oil methanolysis with crude biodiesel as a cosolvent",
pages = "903-910",
volume = "237",
doi = "10.1016/j.fuel.2018.10.056",
url = "https://hdl.handle.net/21.15107/rcub_dais_4070"
}
Todorović, Z. B., Troter, D. Z., Đokić-Stojanović, D. R., Veličković, A. V., Avramović, J. M., Stamenković, O. S., Veselinović, L.,& Veljković, V. B.. (2019). Optimization of CaO-catalyzed sunflower oil methanolysis with crude biodiesel as a cosolvent. in Fuel
Elsevier., 237, 903-910.
https://doi.org/10.1016/j.fuel.2018.10.056
https://hdl.handle.net/21.15107/rcub_dais_4070
Todorović ZB, Troter DZ, Đokić-Stojanović DR, Veličković AV, Avramović JM, Stamenković OS, Veselinović L, Veljković VB. Optimization of CaO-catalyzed sunflower oil methanolysis with crude biodiesel as a cosolvent. in Fuel. 2019;237:903-910.
doi:10.1016/j.fuel.2018.10.056
https://hdl.handle.net/21.15107/rcub_dais_4070 .
Todorović, Zoran B., Troter, Dragan Z., Đokić-Stojanović, Dušica R., Veličković, Ana V., Avramović, Jelena M., Stamenković, Olivera S., Veselinović, Ljiljana, Veljković, Vlada B., "Optimization of CaO-catalyzed sunflower oil methanolysis with crude biodiesel as a cosolvent" in Fuel, 237 (2019):903-910,
https://doi.org/10.1016/j.fuel.2018.10.056 .,
https://hdl.handle.net/21.15107/rcub_dais_4070 .
28
24
26

Optimization of CaO-catalyzed sunflower oil methanolysis with crude biodiesel as a cosolvent

Todorović, Zoran B.; Troter, Dragan Z.; Đokić Stojanović, Dušica R.; Veličković, Ana V.; Avramović, Jelena M.; Stamenković, Olivera S.; Veselinović, Ljiljana; Veljković, Vlada B.

(Elsevier, 2019)

TY  - JOUR
AU  - Todorović, Zoran B.
AU  - Troter, Dragan Z.
AU  - Đokić Stojanović, Dušica R.
AU  - Veličković, Ana V.
AU  - Avramović, Jelena M.
AU  - Stamenković, Olivera S.
AU  - Veselinović, Ljiljana
AU  - Veljković, Vlada B.
PY  - 2019
UR  - http://www.sciencedirect.com/science/article/pii/S0016236118317691
UR  - https://dais.sanu.ac.rs/123456789/4069
AB  - Crude biodiesel was proven as a cosolvent in the methanolysis of sunflower oil catalyzed by calcined CaO. This reaction was modeled and optimized statistically in terms of reaction temperature (33.2–66.8 °C), methanol-to-oil molar ratio (3.5:1–8.5:1) and catalyst concentration (0.219–1.065 mol/L). The cosolvent loading was 10 wt% (based on oil weight). The optimum reaction conditions were found to be: the methanol-to-oil molar ratio of 7.1:1, the catalyst concentration of 0.74 mol/L and the reaction temperature 52 °C, ensuring the best esters content of 99.8%, for the reaction time of 1.5 h, which is close to the reported experimental value of 98.9%. Also, the used catalyst was recycled with no additional treatment in the further four consecutive cycles under the following reaction conditions: methanol-to-oil molar ratio 6:1, the concentration of catalyst 0.642 mol/L (only in the first run), the reaction temperature 50 °C, cosolvent-crude biodiesel loading 10 wt% to oil weight. The second recycling reaction provided the highest FAME content of 97.7% after 5 h.
PB  - Elsevier
T2  - Fuel
T1  - Optimization of CaO-catalyzed sunflower oil methanolysis with crude biodiesel as a cosolvent
SP  - 903
EP  - 910
VL  - 237
DO  - 10.1016/j.fuel.2018.10.056
UR  - https://hdl.handle.net/21.15107/rcub_dais_4069
ER  - 
@article{
author = "Todorović, Zoran B. and Troter, Dragan Z. and Đokić Stojanović, Dušica R. and Veličković, Ana V. and Avramović, Jelena M. and Stamenković, Olivera S. and Veselinović, Ljiljana and Veljković, Vlada B.",
year = "2019",
abstract = "Crude biodiesel was proven as a cosolvent in the methanolysis of sunflower oil catalyzed by calcined CaO. This reaction was modeled and optimized statistically in terms of reaction temperature (33.2–66.8 °C), methanol-to-oil molar ratio (3.5:1–8.5:1) and catalyst concentration (0.219–1.065 mol/L). The cosolvent loading was 10 wt% (based on oil weight). The optimum reaction conditions were found to be: the methanol-to-oil molar ratio of 7.1:1, the catalyst concentration of 0.74 mol/L and the reaction temperature 52 °C, ensuring the best esters content of 99.8%, for the reaction time of 1.5 h, which is close to the reported experimental value of 98.9%. Also, the used catalyst was recycled with no additional treatment in the further four consecutive cycles under the following reaction conditions: methanol-to-oil molar ratio 6:1, the concentration of catalyst 0.642 mol/L (only in the first run), the reaction temperature 50 °C, cosolvent-crude biodiesel loading 10 wt% to oil weight. The second recycling reaction provided the highest FAME content of 97.7% after 5 h.",
publisher = "Elsevier",
journal = "Fuel",
title = "Optimization of CaO-catalyzed sunflower oil methanolysis with crude biodiesel as a cosolvent",
pages = "903-910",
volume = "237",
doi = "10.1016/j.fuel.2018.10.056",
url = "https://hdl.handle.net/21.15107/rcub_dais_4069"
}
Todorović, Z. B., Troter, D. Z., Đokić Stojanović, D. R., Veličković, A. V., Avramović, J. M., Stamenković, O. S., Veselinović, L.,& Veljković, V. B.. (2019). Optimization of CaO-catalyzed sunflower oil methanolysis with crude biodiesel as a cosolvent. in Fuel
Elsevier., 237, 903-910.
https://doi.org/10.1016/j.fuel.2018.10.056
https://hdl.handle.net/21.15107/rcub_dais_4069
Todorović ZB, Troter DZ, Đokić Stojanović DR, Veličković AV, Avramović JM, Stamenković OS, Veselinović L, Veljković VB. Optimization of CaO-catalyzed sunflower oil methanolysis with crude biodiesel as a cosolvent. in Fuel. 2019;237:903-910.
doi:10.1016/j.fuel.2018.10.056
https://hdl.handle.net/21.15107/rcub_dais_4069 .
Todorović, Zoran B., Troter, Dragan Z., Đokić Stojanović, Dušica R., Veličković, Ana V., Avramović, Jelena M., Stamenković, Olivera S., Veselinović, Ljiljana, Veljković, Vlada B., "Optimization of CaO-catalyzed sunflower oil methanolysis with crude biodiesel as a cosolvent" in Fuel, 237 (2019):903-910,
https://doi.org/10.1016/j.fuel.2018.10.056 .,
https://hdl.handle.net/21.15107/rcub_dais_4069 .
28
24
26