TY  - JOUR
AU  - Nježić, Zvonko
AU  - Kostić, Milan D.
AU  - Marić, Boško D.
AU  - Stamenković, Olivera
AU  - Šimurina, Olivera D.
AU  - Krstić, Jugoslav
AU  - Veljković, Vlada B.
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5399
AB  - A low-cost, highly active CaO-based catalyst was prepared from waste filter cake (WFC) from a sugar beet processing factory by calcination in air at 900 °C for 2 h, referred to as the calcined filter cake (CFC). It was used to catalyze the rapeseed oil transesterification with methanol under mild reaction conditions (methanol-to-oil molar ratio of 9:1, catalyst loading of 4–10 %, and reaction temperature of 40–60 °C). Rapeseed oil was characterized regarding the physicochemical properties and fatty acid profile. Low free fatty acid content (about 2.0 mg KOH/g) allowed the direct use of the base CFC catalyst for rapeseed oil transesterification. Rapeseed oil has more unsaturated fatty acids (about 93 %), with oleic acid as the most abundant, than saturated fatty acids (about 7 %). A simplified model combining the changing mechanism of the reaction and the triacylglycerols mass transfer limitation successfully describes the kinetics of transesterification. A good agreement between the model and the experiment was proved by the mean relative percentage deviation for the conversion degree of only ± 7.43 % (based on 42 data). The apparent reaction rate constant follows the Arrhenius equation with the activation energy of 51.9 kJ mol−1. The FAME content higher than 96.5 % can be obtained in wide ranges of the catalyst amount (4–10 %) and the reaction time (about 45–70 min). The following conditions were optimum: the reaction temperature of 59.2 °C, the catalyst loading of 9.1 % (based on the oil weight), and the reaction time of 47 min.
PB  - Elsevier
T2  - Fuel
T1  - Kinetics and optimization of biodiesel production from rapeseed oil over calcined waste filter cake from sugar beet processing plant
VL  - 334
SP  - 126581
DO  - 10.1016/j.fuel.2022.126581
ER  - 

@article{
author = "Nježić, Zvonko and Kostić, Milan D. and Marić, Boško D. and Stamenković, Olivera and Šimurina, Olivera D. and Krstić, Jugoslav and Veljković, Vlada B.",
year = "2023",
abstract = "A low-cost, highly active CaO-based catalyst was prepared from waste filter cake (WFC) from a sugar beet processing factory by calcination in air at 900 °C for 2 h, referred to as the calcined filter cake (CFC). It was used to catalyze the rapeseed oil transesterification with methanol under mild reaction conditions (methanol-to-oil molar ratio of 9:1, catalyst loading of 4–10 %, and reaction temperature of 40–60 °C). Rapeseed oil was characterized regarding the physicochemical properties and fatty acid profile. Low free fatty acid content (about 2.0 mg KOH/g) allowed the direct use of the base CFC catalyst for rapeseed oil transesterification. Rapeseed oil has more unsaturated fatty acids (about 93 %), with oleic acid as the most abundant, than saturated fatty acids (about 7 %). A simplified model combining the changing mechanism of the reaction and the triacylglycerols mass transfer limitation successfully describes the kinetics of transesterification. A good agreement between the model and the experiment was proved by the mean relative percentage deviation for the conversion degree of only ± 7.43 % (based on 42 data). The apparent reaction rate constant follows the Arrhenius equation with the activation energy of 51.9 kJ mol−1. The FAME content higher than 96.5 % can be obtained in wide ranges of the catalyst amount (4–10 %) and the reaction time (about 45–70 min). The following conditions were optimum: the reaction temperature of 59.2 °C, the catalyst loading of 9.1 % (based on the oil weight), and the reaction time of 47 min.",
publisher = "Elsevier",
journal = "Fuel",
title = "Kinetics and optimization of biodiesel production from rapeseed oil over calcined waste filter cake from sugar beet processing plant",
volume = "334",
pages = "126581",
doi = "10.1016/j.fuel.2022.126581"
}

Nježić, Z., Kostić, M. D., Marić, B. D., Stamenković, O., Šimurina, O. D., Krstić, J.,& Veljković, V. B.. (2023). Kinetics and optimization of biodiesel production from rapeseed oil over calcined waste filter cake from sugar beet processing plant. in Fuel
Elsevier., 334, 126581.
https://doi.org/10.1016/j.fuel.2022.126581

Nježić Z, Kostić MD, Marić BD, Stamenković O, Šimurina OD, Krstić J, Veljković VB. Kinetics and optimization of biodiesel production from rapeseed oil over calcined waste filter cake from sugar beet processing plant. in Fuel. 2023;334:126581.
doi:10.1016/j.fuel.2022.126581 .

Nježić, Zvonko, Kostić, Milan D., Marić, Boško D., Stamenković, Olivera, Šimurina, Olivera D., Krstić, Jugoslav, Veljković, Vlada B., "Kinetics and optimization of biodiesel production from rapeseed oil over calcined waste filter cake from sugar beet processing plant" in Fuel, 334 (2023):126581,
https://doi.org/10.1016/j.fuel.2022.126581 . .

TY  - JOUR
AU  - Krstić, Jugoslav
AU  - Nježić, Zvonko B.
AU  - Kostić, Milan D.
AU  - Marić, Boško D.
AU  - Šimurina, Olivera D.
AU  - Stamenković, Olivera
AU  - Veljković, Vlada
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5402
AB  - A solid catalyst was prepared from waste filter cake (WFC) from a sugar beet processing plant and used, after calcination at 900 °C within 2 h, for biodiesel production from rapeseed oil and methanol. The calcined WFC (CFC) catalyst was characterized by XRF, FTIR, XRD, TGA/DTG, TPDe, TPD-CO2, SEM, N2 physisorption, and Hg porosimetry. The CFC is a CaO-based catalyst with a rigid, sustainable macroporous structure with the largest particles of 2.0 × 0.5 µm, a specific surface area of 7.3 m2/g, and a basicity of 0.27 mmol/g. It provides high conversion of 97.9% in 1 h at the methanol-to-oil molar ratio of 9:1, the temperature of 60 °C, and the catalyst loading of 10% of the oil mass. Its catalytic efficiency is comparable to the WFC-based nanocatalysts and CaO-based catalysts from natural sources. CFC was reused twice with a negligible decrease in catalytic activity, ensuring a FAME content above 97% in 1 h. The biodiesel produced from rapeseed oil over the CFC catalyst has good fuel properties that fulfill most of EN 14214. Therefore, WFC is a promising source of a low-cost, highly active, basic, and environmentally friendly CFC catalyst, which could reduce biodiesel production costs. From this point of view, this catalyst has great potential for developing the process at the commercial level.
PB  - Elsevier
T2  - Process Safety and Environmental Protection
T1  - Biodiesel production from rapeseed oil over calcined waste filter cake from sugar beet processing
VL  - 168
SP  - 463
EP  - 473
DO  - 10.1016/j.psep.2022.10.021
ER  - 

@article{
author = "Krstić, Jugoslav and Nježić, Zvonko B. and Kostić, Milan D. and Marić, Boško D. and Šimurina, Olivera D. and Stamenković, Olivera and Veljković, Vlada",
year = "2022",
abstract = "A solid catalyst was prepared from waste filter cake (WFC) from a sugar beet processing plant and used, after calcination at 900 °C within 2 h, for biodiesel production from rapeseed oil and methanol. The calcined WFC (CFC) catalyst was characterized by XRF, FTIR, XRD, TGA/DTG, TPDe, TPD-CO2, SEM, N2 physisorption, and Hg porosimetry. The CFC is a CaO-based catalyst with a rigid, sustainable macroporous structure with the largest particles of 2.0 × 0.5 µm, a specific surface area of 7.3 m2/g, and a basicity of 0.27 mmol/g. It provides high conversion of 97.9% in 1 h at the methanol-to-oil molar ratio of 9:1, the temperature of 60 °C, and the catalyst loading of 10% of the oil mass. Its catalytic efficiency is comparable to the WFC-based nanocatalysts and CaO-based catalysts from natural sources. CFC was reused twice with a negligible decrease in catalytic activity, ensuring a FAME content above 97% in 1 h. The biodiesel produced from rapeseed oil over the CFC catalyst has good fuel properties that fulfill most of EN 14214. Therefore, WFC is a promising source of a low-cost, highly active, basic, and environmentally friendly CFC catalyst, which could reduce biodiesel production costs. From this point of view, this catalyst has great potential for developing the process at the commercial level.",
publisher = "Elsevier",
journal = "Process Safety and Environmental Protection",
title = "Biodiesel production from rapeseed oil over calcined waste filter cake from sugar beet processing",
volume = "168",
pages = "463-473",
doi = "10.1016/j.psep.2022.10.021"
}

Krstić, J., Nježić, Z. B., Kostić, M. D., Marić, B. D., Šimurina, O. D., Stamenković, O.,& Veljković, V.. (2022). Biodiesel production from rapeseed oil over calcined waste filter cake from sugar beet processing. in Process Safety and Environmental Protection
Elsevier., 168, 463-473.
https://doi.org/10.1016/j.psep.2022.10.021

Krstić J, Nježić ZB, Kostić MD, Marić BD, Šimurina OD, Stamenković O, Veljković V. Biodiesel production from rapeseed oil over calcined waste filter cake from sugar beet processing. in Process Safety and Environmental Protection. 2022;168:463-473.
doi:10.1016/j.psep.2022.10.021 .

Krstić, Jugoslav, Nježić, Zvonko B., Kostić, Milan D., Marić, Boško D., Šimurina, Olivera D., Stamenković, Olivera, Veljković, Vlada, "Biodiesel production from rapeseed oil over calcined waste filter cake from sugar beet processing" in Process Safety and Environmental Protection, 168 (2022):463-473,
https://doi.org/10.1016/j.psep.2022.10.021 . .