TY  - JOUR
AU  - Wan, Liang
AU  - Liu, Hui
AU  - Nasreen, Sadia
AU  - Lukić, Ivana
AU  - Skala, Dejan
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4036
AB  - The manganese carbonate catalyst, prepared by precipitation method, was used in transesterification of soybean oil under subcritical condition of methanol. Catalyst samples were characterized by X-ray diffraction (XRD), Fourier trans-form infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS). The triacylglycerol (TAG) conversion and fatty acid methyl esters (FAME) yield were determined using high performance liquid chromatography (HPLC). The transesterification was realized for 1 h using various working conditions: 0-3 wt.% of catalyst (based on the mass of oil), the mole ratio of methanol to oil from 13:1 to 27:1 and temperature ranging from 393 to 473 K. A maximum TAG conversion of 98.1% could be obtained at the optimal reaction conditions: 2 wt.% of catalyst, methanol/oil mole ratio of 21:1, for 1 h in a batch reactor at 453 K. Kinetic analysis showed that the model based on mass transfer and chemical reaction at the catalyst surface confirmed the experimental data. Using that kinetic expression, the effect of continuous transesterification was proposed and verified by a 360-h long realized experiment in a laboratory packed-bed reactor (PBR). Slow deactivation of the catalyst was caused by leaching of Mn in both biodiesel and glycerol phases and by blocking the active sites of the catalyst with organic compounds.
PB  - Savez hemijskih inženjera, Beograd
T2  - Chemical Industry & Chemical Engineering Quarterly
T1  - High temperature transesterification of soybean oil with methanol using manganese carbonate as catalyst
EP  - 22
IS  - 1
SP  - 9
VL  - 24
DO  - 10.2298/CICEQ170221013W
ER  - 

@article{
author = "Wan, Liang and Liu, Hui and Nasreen, Sadia and Lukić, Ivana and Skala, Dejan",
year = "2018",
abstract = "The manganese carbonate catalyst, prepared by precipitation method, was used in transesterification of soybean oil under subcritical condition of methanol. Catalyst samples were characterized by X-ray diffraction (XRD), Fourier trans-form infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS). The triacylglycerol (TAG) conversion and fatty acid methyl esters (FAME) yield were determined using high performance liquid chromatography (HPLC). The transesterification was realized for 1 h using various working conditions: 0-3 wt.% of catalyst (based on the mass of oil), the mole ratio of methanol to oil from 13:1 to 27:1 and temperature ranging from 393 to 473 K. A maximum TAG conversion of 98.1% could be obtained at the optimal reaction conditions: 2 wt.% of catalyst, methanol/oil mole ratio of 21:1, for 1 h in a batch reactor at 453 K. Kinetic analysis showed that the model based on mass transfer and chemical reaction at the catalyst surface confirmed the experimental data. Using that kinetic expression, the effect of continuous transesterification was proposed and verified by a 360-h long realized experiment in a laboratory packed-bed reactor (PBR). Slow deactivation of the catalyst was caused by leaching of Mn in both biodiesel and glycerol phases and by blocking the active sites of the catalyst with organic compounds.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Chemical Industry & Chemical Engineering Quarterly",
title = "High temperature transesterification of soybean oil with methanol using manganese carbonate as catalyst",
pages = "22-9",
number = "1",
volume = "24",
doi = "10.2298/CICEQ170221013W"
}

Wan, L., Liu, H., Nasreen, S., Lukić, I.,& Skala, D.. (2018). High temperature transesterification of soybean oil with methanol using manganese carbonate as catalyst. in Chemical Industry & Chemical Engineering Quarterly
Savez hemijskih inženjera, Beograd., 24(1), 9-22.
https://doi.org/10.2298/CICEQ170221013W

Wan L, Liu H, Nasreen S, Lukić I, Skala D. High temperature transesterification of soybean oil with methanol using manganese carbonate as catalyst. in Chemical Industry & Chemical Engineering Quarterly. 2018;24(1):9-22.
doi:10.2298/CICEQ170221013W .

Wan, Liang, Liu, Hui, Nasreen, Sadia, Lukić, Ivana, Skala, Dejan, "High temperature transesterification of soybean oil with methanol using manganese carbonate as catalyst" in Chemical Industry & Chemical Engineering Quarterly, 24, no. 1 (2018):9-22,
https://doi.org/10.2298/CICEQ170221013W . .

TY  - JOUR
AU  - Nasreen, Sadia
AU  - Liu, Hui
AU  - Lukić, Ivana
AU  - Qurashi, Liaqat Ali
AU  - Skala, Dejan
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3382
AB  - Currently, the catalytic efficiency and reusability of the solid base catalysts cannot meet the demand of industrial biodiesel production under low temperature. The purpose of this study is to define the kinetics of heterogeneous transesterification process that could be used for the prediction of the biodiesel synthesis at high temperature and pressure. The focus in this study was paid to recently repotted data obtained with different catalysts used for biodiesel synthesis in a batch reactor at high temperatures. It was shown that three kinetic models, including: a) irreversible first order reaction, b) reaction with changeable order and c) resistances of mass transfer and chemical reaction at active sites of the catalyst, could be applied for predicting the effect of high temperature of the transesterification. The apparent reaction rate constant of the irreversible first order reaction was determined, as well as the parameters of the other two, more complicated kinetic. models. The best agreement was obtained with the more complicated models and the mean relative percent deviation between calculated and experimentally determined triacylglycerols conversion for these kinetic models is between 3 and 10%.
PB  - Savez hemijskih inženjera, Beograd
T2  - Chemical Industry & Chemical Engineering Quarterly
T1  - Heterogeneous kinetics of vegetable oil transesterification at high temperature
EP  - 429
IS  - 4
SP  - 419
VL  - 22
DO  - 10.2298/CICEQ160107011N
ER  - 

@article{
author = "Nasreen, Sadia and Liu, Hui and Lukić, Ivana and Qurashi, Liaqat Ali and Skala, Dejan",
year = "2016",
abstract = "Currently, the catalytic efficiency and reusability of the solid base catalysts cannot meet the demand of industrial biodiesel production under low temperature. The purpose of this study is to define the kinetics of heterogeneous transesterification process that could be used for the prediction of the biodiesel synthesis at high temperature and pressure. The focus in this study was paid to recently repotted data obtained with different catalysts used for biodiesel synthesis in a batch reactor at high temperatures. It was shown that three kinetic models, including: a) irreversible first order reaction, b) reaction with changeable order and c) resistances of mass transfer and chemical reaction at active sites of the catalyst, could be applied for predicting the effect of high temperature of the transesterification. The apparent reaction rate constant of the irreversible first order reaction was determined, as well as the parameters of the other two, more complicated kinetic. models. The best agreement was obtained with the more complicated models and the mean relative percent deviation between calculated and experimentally determined triacylglycerols conversion for these kinetic models is between 3 and 10%.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Chemical Industry & Chemical Engineering Quarterly",
title = "Heterogeneous kinetics of vegetable oil transesterification at high temperature",
pages = "429-419",
number = "4",
volume = "22",
doi = "10.2298/CICEQ160107011N"
}

Nasreen, S., Liu, H., Lukić, I., Qurashi, L. A.,& Skala, D.. (2016). Heterogeneous kinetics of vegetable oil transesterification at high temperature. in Chemical Industry & Chemical Engineering Quarterly
Savez hemijskih inženjera, Beograd., 22(4), 419-429.
https://doi.org/10.2298/CICEQ160107011N

Nasreen S, Liu H, Lukić I, Qurashi LA, Skala D. Heterogeneous kinetics of vegetable oil transesterification at high temperature. in Chemical Industry & Chemical Engineering Quarterly. 2016;22(4):419-429.
doi:10.2298/CICEQ160107011N .

Nasreen, Sadia, Liu, Hui, Lukić, Ivana, Qurashi, Liaqat Ali, Skala, Dejan, "Heterogeneous kinetics of vegetable oil transesterification at high temperature" in Chemical Industry & Chemical Engineering Quarterly, 22, no. 4 (2016):419-429,
https://doi.org/10.2298/CICEQ160107011N . .

TY  - JOUR
AU  - Nasreen, Sadia
AU  - Liu, Hui
AU  - Qureshi, Liaqat Ali
AU  - Sissou, Zakari
AU  - Lukić, Ivana
AU  - Skala, Dejan
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3433
AB  - A heterogeneous cerium-manganese oxide catalyst was synthesized by a co-precipitation method, characterized and tested in soybean oil transesterification with methanol under subcritical condition for methanol. Conversion of triglycerides after 40 min of transesterification in a batch process was over 99% with a fatty acid methyl ester (FAME) yield of 91.6% when 3 wt.% of catalyst based on oil, and 18:1 methanol/oil molar ratio were applied. The same amount of catalyst was used in 12 cycles of transesterification with catalyst regeneration performed only after the 7th cycle. The catalyst exhibited good tolerance toward soybean oil containing below 1.5 wt.% of water or 4 wt.% of free fatty acids. The mechanisms of Ce/Mn catalytic activity and its deactivation were discussed according to the characterization of the fresh and used catalyst according to results of different analytical methods: the Hammett titration, BET surface area, scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS), FTIR, X-ray diffraction (XRD), ICP-MS and TG-DSC. It was assumed that deactivation of catalyst was mainly a consequence of manganese solubility in methanol and glycerol.
PB  - Elsevier Science Bv, Amsterdam
T2  - Fuel Processing Technology
T1  - Cerium-manganese oxide as catalyst for transesterification of soybean oil with subcritical methanol
EP  - 84
SP  - 76
VL  - 148
DO  - 10.1016/j.fuproc.2016.02.035
ER  - 

@article{
author = "Nasreen, Sadia and Liu, Hui and Qureshi, Liaqat Ali and Sissou, Zakari and Lukić, Ivana and Skala, Dejan",
year = "2016",
abstract = "A heterogeneous cerium-manganese oxide catalyst was synthesized by a co-precipitation method, characterized and tested in soybean oil transesterification with methanol under subcritical condition for methanol. Conversion of triglycerides after 40 min of transesterification in a batch process was over 99% with a fatty acid methyl ester (FAME) yield of 91.6% when 3 wt.% of catalyst based on oil, and 18:1 methanol/oil molar ratio were applied. The same amount of catalyst was used in 12 cycles of transesterification with catalyst regeneration performed only after the 7th cycle. The catalyst exhibited good tolerance toward soybean oil containing below 1.5 wt.% of water or 4 wt.% of free fatty acids. The mechanisms of Ce/Mn catalytic activity and its deactivation were discussed according to the characterization of the fresh and used catalyst according to results of different analytical methods: the Hammett titration, BET surface area, scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS), FTIR, X-ray diffraction (XRD), ICP-MS and TG-DSC. It was assumed that deactivation of catalyst was mainly a consequence of manganese solubility in methanol and glycerol.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Fuel Processing Technology",
title = "Cerium-manganese oxide as catalyst for transesterification of soybean oil with subcritical methanol",
pages = "84-76",
volume = "148",
doi = "10.1016/j.fuproc.2016.02.035"
}

Nasreen, S., Liu, H., Qureshi, L. A., Sissou, Z., Lukić, I.,& Skala, D.. (2016). Cerium-manganese oxide as catalyst for transesterification of soybean oil with subcritical methanol. in Fuel Processing Technology
Elsevier Science Bv, Amsterdam., 148, 76-84.
https://doi.org/10.1016/j.fuproc.2016.02.035

Nasreen S, Liu H, Qureshi LA, Sissou Z, Lukić I, Skala D. Cerium-manganese oxide as catalyst for transesterification of soybean oil with subcritical methanol. in Fuel Processing Technology. 2016;148:76-84.
doi:10.1016/j.fuproc.2016.02.035 .

Nasreen, Sadia, Liu, Hui, Qureshi, Liaqat Ali, Sissou, Zakari, Lukić, Ivana, Skala, Dejan, "Cerium-manganese oxide as catalyst for transesterification of soybean oil with subcritical methanol" in Fuel Processing Technology, 148 (2016):76-84,
https://doi.org/10.1016/j.fuproc.2016.02.035 . .