TY  - JOUR
AU  - Miladinovic, Marija R.
AU  - Krstic, Jugoslav B.
AU  - Zdujic, Miodrag, V
AU  - Veselinovic, Ljiljana M.
AU  - Veljović, Đorđe
AU  - Bankovic-Ilic, Ivana B.
AU  - Stamenkovic, Olivera S.
AU  - Veljkovic, Vlada B.
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4976
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, N-2 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 degrees 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 dm(6)/(min.mol(2)).
T2  - Renewable Energy
T1  - Transesterification of used cooking sunflower oil catalyzed by hazelnut shell ash
EP  - 113
SP  - 103
VL  - 183
DO  - 10.1016/j.renene.2021.10.071
ER  - 

@article{
author = "Miladinovic, Marija R. and Krstic, Jugoslav B. and Zdujic, Miodrag, V and Veselinovic, Ljiljana M. and Veljović, Đorđe and Bankovic-Ilic, Ivana B. and Stamenkovic, Olivera S. and Veljkovic, 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, N-2 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 degrees 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 dm(6)/(min.mol(2)).",
journal = "Renewable Energy",
title = "Transesterification of used cooking sunflower oil catalyzed by hazelnut shell ash",
pages = "113-103",
volume = "183",
doi = "10.1016/j.renene.2021.10.071"
}

Miladinovic, M. R., Krstic, J. B., Zdujic, M. V., Veselinovic, L. M., Veljović, Đ., Bankovic-Ilic, I. B., Stamenkovic, O. S.,& Veljkovic, V. B.. (2022). Transesterification of used cooking sunflower oil catalyzed by hazelnut shell ash. in Renewable Energy, 183, 103-113.
https://doi.org/10.1016/j.renene.2021.10.071

Miladinovic MR, Krstic JB, Zdujic MV, Veselinovic LM, Veljović Đ, Bankovic-Ilic IB, Stamenkovic OS, Veljkovic 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 .

Miladinovic, Marija R., Krstic, Jugoslav B., Zdujic, Miodrag, V, Veselinovic, Ljiljana M., Veljović, Đorđe, Bankovic-Ilic, Ivana B., Stamenkovic, Olivera S., Veljkovic, 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 . .

TY  - JOUR
AU  - Prokić-Vidojević, Dragana
AU  - Glišić, Sandra
AU  - Krstić, Jugoslav B.
AU  - Orlović, Aleksandar
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4860
AB  - Re/Pd-TiO2/SiO2 and Co/Mo-Al2O3/SiO2 aerogel catalysts were synthesized using sol-gel method and super-critical drying in excess solvent, and investigated in the hydrodesulphurisation (HDS) of dibenzothiophene (DBT) and 4,6-dimethyl dibenzothiophene (4,6-DMDBT). The influence of supercritical drying on the final catalytic properties of the materials was determined by parallel synthesis of aerogels and xerogels for Re/Pd-TiO2/SiO2 catalysts. The sol-gel method and supercritical drying were found to result in amorphous aerogels with relatively high degree of uniformity, of both supports and active phases. Corresponding xerogels were found to be similar to aerogels in terms of composition and structure, but characterized by lower specific surface areas. Catalytic activity of Co/Mo-Al2O3/SiO2 aerogel catalysts in HDS of DBT and 4,6-DMDBT has shown no major improvement in comparison to conventional Co/Mo catalyst. On the other hand, Re/Pd-TiO2/SiO2 aerogels, obtained with the addition of mesitylene or without it, achieved 70 % and 64 % higher conversion of 4,6-DMDBT than conventional Co/Mo catalyst, respectively. Increased catalytic activity can be attributed to well dispersed Re and Pd active phases across the catalyst structure, good incorporation of Ti within silica matrix, increased mesopore volumes and high specific surface areas.
T2  - Catalysis Today
T1  - Aerogel Re/Pd-TiO2/SiO2 and Co/Mo-Al2O3/SiO2 catalysts for hydrodesulphurisation of dibenzothiophene and 4,6-dimethyldibenzothiophene
EP  - 23
SP  - 10
VL  - 378
DO  - 10.1016/j.cattod.2020.11.022
ER  - 

@article{
author = "Prokić-Vidojević, Dragana and Glišić, Sandra and Krstić, Jugoslav B. and Orlović, Aleksandar",
year = "2021",
abstract = "Re/Pd-TiO2/SiO2 and Co/Mo-Al2O3/SiO2 aerogel catalysts were synthesized using sol-gel method and super-critical drying in excess solvent, and investigated in the hydrodesulphurisation (HDS) of dibenzothiophene (DBT) and 4,6-dimethyl dibenzothiophene (4,6-DMDBT). The influence of supercritical drying on the final catalytic properties of the materials was determined by parallel synthesis of aerogels and xerogels for Re/Pd-TiO2/SiO2 catalysts. The sol-gel method and supercritical drying were found to result in amorphous aerogels with relatively high degree of uniformity, of both supports and active phases. Corresponding xerogels were found to be similar to aerogels in terms of composition and structure, but characterized by lower specific surface areas. Catalytic activity of Co/Mo-Al2O3/SiO2 aerogel catalysts in HDS of DBT and 4,6-DMDBT has shown no major improvement in comparison to conventional Co/Mo catalyst. On the other hand, Re/Pd-TiO2/SiO2 aerogels, obtained with the addition of mesitylene or without it, achieved 70 % and 64 % higher conversion of 4,6-DMDBT than conventional Co/Mo catalyst, respectively. Increased catalytic activity can be attributed to well dispersed Re and Pd active phases across the catalyst structure, good incorporation of Ti within silica matrix, increased mesopore volumes and high specific surface areas.",
journal = "Catalysis Today",
title = "Aerogel Re/Pd-TiO2/SiO2 and Co/Mo-Al2O3/SiO2 catalysts for hydrodesulphurisation of dibenzothiophene and 4,6-dimethyldibenzothiophene",
pages = "23-10",
volume = "378",
doi = "10.1016/j.cattod.2020.11.022"
}

Prokić-Vidojević, D., Glišić, S., Krstić, J. B.,& Orlović, A.. (2021). Aerogel Re/Pd-TiO2/SiO2 and Co/Mo-Al2O3/SiO2 catalysts for hydrodesulphurisation of dibenzothiophene and 4,6-dimethyldibenzothiophene. in Catalysis Today, 378, 10-23.
https://doi.org/10.1016/j.cattod.2020.11.022

Prokić-Vidojević D, Glišić S, Krstić JB, Orlović A. Aerogel Re/Pd-TiO2/SiO2 and Co/Mo-Al2O3/SiO2 catalysts for hydrodesulphurisation of dibenzothiophene and 4,6-dimethyldibenzothiophene. in Catalysis Today. 2021;378:10-23.
doi:10.1016/j.cattod.2020.11.022 .

Prokić-Vidojević, Dragana, Glišić, Sandra, Krstić, Jugoslav B., Orlović, Aleksandar, "Aerogel Re/Pd-TiO2/SiO2 and Co/Mo-Al2O3/SiO2 catalysts for hydrodesulphurisation of dibenzothiophene and 4,6-dimethyldibenzothiophene" in Catalysis Today, 378 (2021):10-23,
https://doi.org/10.1016/j.cattod.2020.11.022 . .