TY  - JOUR
AU  - Marinković, Miloš
AU  - Waisi, Hadi
AU  - Blagojević, Stevan
AU  - Zarubica, Aleksandra R.
AU  - Ljupković, Radomir
AU  - Krstić, Aleksandra
AU  - Janković, Bojan Ž.
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10134
AB  - The essence of this study is synthesis of a newly developed and efficient heterogeneous catalyst based on aluminum oxide support promoted with potassium iodide (KI) as active dopant responsible for pronounced catalyst activity. Modified sol–gel, reflux and hydrothermal method were used for synthesis of aluminum-oxide support using aluminum isopropoxide as a precursor. The γ-Al2O3 support and KI/γ-Al2O3 catalyst samples were examined by various experimental techniques. Effects of several operational parameters were considered and those are: methanol to sunflower oil molar ratio, catalyst loadings, reaction time and reaction stirring rate. The obtained results indicated that modified sol–gel method for synthesis of γ-Al2O3 catalyst support is the most favorable for obtaining the catalyst with superior catalytic performances in transesterification of sunflower oil. A maximum conversion (triglycerides to methyl esters) of 99.99% was achieved using the SG-KI/γ-Al2O3-770 catalyst under following optimal process parameters: 15:1 methanol to sunflower oil molar ratio, 2.5 wt% catalysts loading, 600 rpm stirring rate and 4 h of the reaction run.
T2  - Fuel
T1  - The effect of process parameters and catalyst support preparation methods on the catalytic efficiency in transesterification of sunflower oil over heterogeneous KI/Al2O3-based catalysts for biodiesel production
VL  - 315
SP  - 123246
DO  - 10.1016/j.fuel.2022.123246
ER  - 

@article{
author = "Marinković, Miloš and Waisi, Hadi and Blagojević, Stevan and Zarubica, Aleksandra R. and Ljupković, Radomir and Krstić, Aleksandra and Janković, Bojan Ž.",
year = "2022",
abstract = "The essence of this study is synthesis of a newly developed and efficient heterogeneous catalyst based on aluminum oxide support promoted with potassium iodide (KI) as active dopant responsible for pronounced catalyst activity. Modified sol–gel, reflux and hydrothermal method were used for synthesis of aluminum-oxide support using aluminum isopropoxide as a precursor. The γ-Al2O3 support and KI/γ-Al2O3 catalyst samples were examined by various experimental techniques. Effects of several operational parameters were considered and those are: methanol to sunflower oil molar ratio, catalyst loadings, reaction time and reaction stirring rate. The obtained results indicated that modified sol–gel method for synthesis of γ-Al2O3 catalyst support is the most favorable for obtaining the catalyst with superior catalytic performances in transesterification of sunflower oil. A maximum conversion (triglycerides to methyl esters) of 99.99% was achieved using the SG-KI/γ-Al2O3-770 catalyst under following optimal process parameters: 15:1 methanol to sunflower oil molar ratio, 2.5 wt% catalysts loading, 600 rpm stirring rate and 4 h of the reaction run.",
journal = "Fuel",
title = "The effect of process parameters and catalyst support preparation methods on the catalytic efficiency in transesterification of sunflower oil over heterogeneous KI/Al2O3-based catalysts for biodiesel production",
volume = "315",
pages = "123246",
doi = "10.1016/j.fuel.2022.123246"
}

Marinković, M., Waisi, H., Blagojević, S., Zarubica, A. R., Ljupković, R., Krstić, A.,& Janković, B. Ž.. (2022). The effect of process parameters and catalyst support preparation methods on the catalytic efficiency in transesterification of sunflower oil over heterogeneous KI/Al2O3-based catalysts for biodiesel production. in Fuel, 315, 123246.
https://doi.org/10.1016/j.fuel.2022.123246

Marinković M, Waisi H, Blagojević S, Zarubica AR, Ljupković R, Krstić A, Janković BŽ. The effect of process parameters and catalyst support preparation methods on the catalytic efficiency in transesterification of sunflower oil over heterogeneous KI/Al2O3-based catalysts for biodiesel production. in Fuel. 2022;315:123246.
doi:10.1016/j.fuel.2022.123246 .

Marinković, Miloš, Waisi, Hadi, Blagojević, Stevan, Zarubica, Aleksandra R., Ljupković, Radomir, Krstić, Aleksandra, Janković, Bojan Ž., "The effect of process parameters and catalyst support preparation methods on the catalytic efficiency in transesterification of sunflower oil over heterogeneous KI/Al2O3-based catalysts for biodiesel production" in Fuel, 315 (2022):123246,
https://doi.org/10.1016/j.fuel.2022.123246 . .

TY  - JOUR
AU  - Marinković, Miloš
AU  - Waisi, Hadi
AU  - Blagojević, Stevan
AU  - Zarubica, Aleksandra R.
AU  - Ljupković, Radomir
AU  - Krstić, Aleksandra
AU  - Janković, Bojan Ž.
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10192
AB  - The authors regret to inform about an error in the affiliation of the corresponding author in the published version of this article. The correct affiliation of Dr. Bojan Janković should be: University of Belgrade, Department of Physical Chemistry, “Vinča” Institute of Nuclear Sciences – National Institute of the Republic of Serbia, Mike Petrovića Alasa 12–14, P.O. Box 522, 11001 Belgrade, Serbia. The authors would like to apologise for any inconvenience caused.
T2  - Fuel
T1  - Corrigendum to “The effect of process parameters and catalyst support preparation methods on the catalytic efficiency in transesterification of sunflower oil over heterogeneous KI/Al2O3-based catalysts for biodiesel production” [Fuel 315 (2022) 123246]
VL  - 318
SP  - 123677
DO  - 10.1016/j.fuel.2022.123677
ER  - 

@article{
author = "Marinković, Miloš and Waisi, Hadi and Blagojević, Stevan and Zarubica, Aleksandra R. and Ljupković, Radomir and Krstić, Aleksandra and Janković, Bojan Ž.",
year = "2022",
abstract = "The authors regret to inform about an error in the affiliation of the corresponding author in the published version of this article. The correct affiliation of Dr. Bojan Janković should be: University of Belgrade, Department of Physical Chemistry, “Vinča” Institute of Nuclear Sciences – National Institute of the Republic of Serbia, Mike Petrovića Alasa 12–14, P.O. Box 522, 11001 Belgrade, Serbia. The authors would like to apologise for any inconvenience caused.",
journal = "Fuel",
title = "Corrigendum to “The effect of process parameters and catalyst support preparation methods on the catalytic efficiency in transesterification of sunflower oil over heterogeneous KI/Al2O3-based catalysts for biodiesel production” [Fuel 315 (2022) 123246]",
volume = "318",
pages = "123677",
doi = "10.1016/j.fuel.2022.123677"
}

Marinković, M., Waisi, H., Blagojević, S., Zarubica, A. R., Ljupković, R., Krstić, A.,& Janković, B. Ž.. (2022). Corrigendum to “The effect of process parameters and catalyst support preparation methods on the catalytic efficiency in transesterification of sunflower oil over heterogeneous KI/Al2O3-based catalysts for biodiesel production” [Fuel 315 (2022) 123246]. in Fuel, 318, 123677.
https://doi.org/10.1016/j.fuel.2022.123677

Marinković M, Waisi H, Blagojević S, Zarubica AR, Ljupković R, Krstić A, Janković BŽ. Corrigendum to “The effect of process parameters and catalyst support preparation methods on the catalytic efficiency in transesterification of sunflower oil over heterogeneous KI/Al2O3-based catalysts for biodiesel production” [Fuel 315 (2022) 123246]. in Fuel. 2022;318:123677.
doi:10.1016/j.fuel.2022.123677 .

Marinković, Miloš, Waisi, Hadi, Blagojević, Stevan, Zarubica, Aleksandra R., Ljupković, Radomir, Krstić, Aleksandra, Janković, Bojan Ž., "Corrigendum to “The effect of process parameters and catalyst support preparation methods on the catalytic efficiency in transesterification of sunflower oil over heterogeneous KI/Al2O3-based catalysts for biodiesel production” [Fuel 315 (2022) 123246]" in Fuel, 318 (2022):123677,
https://doi.org/10.1016/j.fuel.2022.123677 . .

TY  - JOUR
AU  - Zarubica, Aleksandra R.
AU  - Krstić, Jugoslav B.
AU  - Popović, Dejan
AU  - Krstić, Aleksandra
AU  - Ljupković, Radomir
AU  - Ranđelović, Marjan S.
AU  - Matović, Branko
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9900
AB  - In this paper, NiZnCo ferrite was produced by solid state synthesis, calcination at 1000 °C and sintering at 1250 °C in air atmosphere. The microstructure and phases of the sintered sample were analysed by scanning electron microscopy and X-ray diffraction, respectively. The magnetic properties of the ferrite were evaluated by magnetization and magnetostriction measurements. The complex magnetic permeability and complex permittivity were also measured between 1 MHz-12 GHz and the reflection loss (RL) was calculated in the 100 MHz-12 GHz frequency range. The results show that the ferrite sample presents magnetostrictive behaviour and a saturation magnetization of 71 Am2/kg. Complex permittivity measurements indicate that the material has dielectric behaviour in the whole frequency range studied, with ε′ varying between 7-40, and magnetic behaviour in frequencies between 1 MHz-5 GHz. The minimum RL was found at frequencies between 2.4-3.3 GHz and the calculated RL value for a thickness of 3 mm was lower than −10 dB in frequencies between 2.3-7.3 GHz. These results indicate potential application as microwave absorber in the S band.
T2  - Processing and Application of Ceramics
T1  - Electromagnetic characterization of Ni0.5Zn0.3Co0.2Fe2O4 bulk ceramics in the 1 MHz-12 GHz frequency range
VL  - 15
IS  - 2
SP  - 136
DO  - 10.2298/PAC2102111Z
ER  - 

@article{
author = "Zarubica, Aleksandra R. and Krstić, Jugoslav B. and Popović, Dejan and Krstić, Aleksandra and Ljupković, Radomir and Ranđelović, Marjan S. and Matović, Branko",
year = "2021",
abstract = "In this paper, NiZnCo ferrite was produced by solid state synthesis, calcination at 1000 °C and sintering at 1250 °C in air atmosphere. The microstructure and phases of the sintered sample were analysed by scanning electron microscopy and X-ray diffraction, respectively. The magnetic properties of the ferrite were evaluated by magnetization and magnetostriction measurements. The complex magnetic permeability and complex permittivity were also measured between 1 MHz-12 GHz and the reflection loss (RL) was calculated in the 100 MHz-12 GHz frequency range. The results show that the ferrite sample presents magnetostrictive behaviour and a saturation magnetization of 71 Am2/kg. Complex permittivity measurements indicate that the material has dielectric behaviour in the whole frequency range studied, with ε′ varying between 7-40, and magnetic behaviour in frequencies between 1 MHz-5 GHz. The minimum RL was found at frequencies between 2.4-3.3 GHz and the calculated RL value for a thickness of 3 mm was lower than −10 dB in frequencies between 2.3-7.3 GHz. These results indicate potential application as microwave absorber in the S band.",
journal = "Processing and Application of Ceramics",
title = "Electromagnetic characterization of Ni0.5Zn0.3Co0.2Fe2O4 bulk ceramics in the 1 MHz-12 GHz frequency range",
volume = "15",
number = "2",
pages = "136",
doi = "10.2298/PAC2102111Z"
}

Zarubica, A. R., Krstić, J. B., Popović, D., Krstić, A., Ljupković, R., Ranđelović, M. S.,& Matović, B.. (2021). Electromagnetic characterization of Ni0.5Zn0.3Co0.2Fe2O4 bulk ceramics in the 1 MHz-12 GHz frequency range. in Processing and Application of Ceramics, 15(2), 136.
https://doi.org/10.2298/PAC2102111Z

Zarubica AR, Krstić JB, Popović D, Krstić A, Ljupković R, Ranđelović MS, Matović B. Electromagnetic characterization of Ni0.5Zn0.3Co0.2Fe2O4 bulk ceramics in the 1 MHz-12 GHz frequency range. in Processing and Application of Ceramics. 2021;15(2):136.
doi:10.2298/PAC2102111Z .

Zarubica, Aleksandra R., Krstić, Jugoslav B., Popović, Dejan, Krstić, Aleksandra, Ljupković, Radomir, Ranđelović, Marjan S., Matović, Branko, "Electromagnetic characterization of Ni0.5Zn0.3Co0.2Fe2O4 bulk ceramics in the 1 MHz-12 GHz frequency range" in Processing and Application of Ceramics, 15, no. 2 (2021):136,
https://doi.org/10.2298/PAC2102111Z . .