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Decrease of free fatty acid content in vegetable oil using silica supported ferric sulfate catalyst

Authorized Users Only
2012
Authors
Dokic, Marko
Kesic, Zeljka
Krstić, Jugoslav
Jovanović, Dušan M.
Skala, Dejan
Article (Published version)
Metadata
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Abstract
A difficulty of biodiesel synthesis based on alkaline catalysts obviously exists if free fatty acids (FFAs) content in vegetable oil is above 0.5 wt.%. In this study, the ferric sulfate supported on silica (Fe-2(SO4)(3)/SiO2) was synthesized, activated (at different temperature: 120-600 degrees C) and tested for heterogeneous esterification of FFA (oleic acid) present in sunflower oil (5 wt.%). The catalyst samples were characterized by BET, TG/DTG, XRD and FTIR analyses. Obtained results showed that catalyst activated at 500 degrees C for 2 h in air atmosphere gave the maximal conversion of oleic acid (similar to 97%). Repeated use of catalyst without additional catalyst treatment or re-activation indicated that catalyst posses desired stability and activity. A pseudo-homogeneous kinetic model was proposed with good agreement between calculated and experimental data.
Keywords:
Free fatty acids / Biodiesel / Esterification / Kinetics / Heterogeneous catalysis
Source:
Fuel, 2012, 97, 595-602
Publisher:
  • Elsevier Sci Ltd, Oxford
Funding / projects:
  • Nanostructured Functional and Composite Materials in Catalytic and Sorption Processes (RS-45001)

DOI: 10.1016/j.fuel.2012.03.039

ISSN: 0016-2361

WoS: 000303979400065

Scopus: 2-s2.0-84861193031
[ Google Scholar ]
25
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URI
http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5672
Collections
  • Radovi istraživača / Researchers’ publications (TMF)
Institution/Community
Tehnološko-metalurški fakultet
TY  - JOUR
AU  - Dokic, Marko
AU  - Kesic, Zeljka
AU  - Krstić, Jugoslav
AU  - Jovanović, Dušan M.
AU  - Skala, Dejan
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5672
AB  - A difficulty of biodiesel synthesis based on alkaline catalysts obviously exists if free fatty acids (FFAs) content in vegetable oil is above 0.5 wt.%. In this study, the ferric sulfate supported on silica (Fe-2(SO4)(3)/SiO2) was synthesized, activated (at different temperature: 120-600 degrees C) and tested for heterogeneous esterification of FFA (oleic acid) present in sunflower oil (5 wt.%). The catalyst samples were characterized by BET, TG/DTG, XRD and FTIR analyses. Obtained results showed that catalyst activated at 500 degrees C for 2 h in air atmosphere gave the maximal conversion of oleic acid (similar to 97%). Repeated use of catalyst without additional catalyst treatment or re-activation indicated that catalyst posses desired stability and activity. A pseudo-homogeneous kinetic model was proposed with good agreement between calculated and experimental data.
PB  - Elsevier Sci Ltd, Oxford
T2  - Fuel
T1  - Decrease of free fatty acid content in vegetable oil using silica supported ferric sulfate catalyst
EP  - 602
SP  - 595
VL  - 97
DO  - 10.1016/j.fuel.2012.03.039
ER  - 
@article{
author = "Dokic, Marko and Kesic, Zeljka and Krstić, Jugoslav and Jovanović, Dušan M. and Skala, Dejan",
year = "2012",
abstract = "A difficulty of biodiesel synthesis based on alkaline catalysts obviously exists if free fatty acids (FFAs) content in vegetable oil is above 0.5 wt.%. In this study, the ferric sulfate supported on silica (Fe-2(SO4)(3)/SiO2) was synthesized, activated (at different temperature: 120-600 degrees C) and tested for heterogeneous esterification of FFA (oleic acid) present in sunflower oil (5 wt.%). The catalyst samples were characterized by BET, TG/DTG, XRD and FTIR analyses. Obtained results showed that catalyst activated at 500 degrees C for 2 h in air atmosphere gave the maximal conversion of oleic acid (similar to 97%). Repeated use of catalyst without additional catalyst treatment or re-activation indicated that catalyst posses desired stability and activity. A pseudo-homogeneous kinetic model was proposed with good agreement between calculated and experimental data.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Fuel",
title = "Decrease of free fatty acid content in vegetable oil using silica supported ferric sulfate catalyst",
pages = "602-595",
volume = "97",
doi = "10.1016/j.fuel.2012.03.039"
}
Dokic, M., Kesic, Z., Krstić, J., Jovanović, D. M.,& Skala, D.. (2012). Decrease of free fatty acid content in vegetable oil using silica supported ferric sulfate catalyst. in Fuel
Elsevier Sci Ltd, Oxford., 97, 595-602.
https://doi.org/10.1016/j.fuel.2012.03.039
Dokic M, Kesic Z, Krstić J, Jovanović DM, Skala D. Decrease of free fatty acid content in vegetable oil using silica supported ferric sulfate catalyst. in Fuel. 2012;97:595-602.
doi:10.1016/j.fuel.2012.03.039 .
Dokic, Marko, Kesic, Zeljka, Krstić, Jugoslav, Jovanović, Dušan M., Skala, Dejan, "Decrease of free fatty acid content in vegetable oil using silica supported ferric sulfate catalyst" in Fuel, 97 (2012):595-602,
https://doi.org/10.1016/j.fuel.2012.03.039 . .

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