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Esterification of free fatty acids to biodiesel over heteropolyacids immobilized on mesoporous silica

Paper ID Volume ID Publish Year Pages File Format Full-Text
41539 45892 2010 7 PDF Available
Title
Esterification of free fatty acids to biodiesel over heteropolyacids immobilized on mesoporous silica
Abstract

Tungstophosphoric acid (PW), molybdophosphoric acid (PMo) and tungstosilicic acid (SiW) immobilized on SBA-15 were used, as catalysts, in the esterification of palmitic acid with methanol, at 60 °C. Catalysts were characterized by N2 adsorption, FTIR, X-ray diffraction, ICP-AES and TEM.All catalysts exhibited high catalytic activity in palmitic acid esterification with methanol. It was observed that the catalytic activity decreases in the follow series: PW1-SBA-15 > SiW-SBA-15 > PMo-SBA-15.A series of PW immobilized on SBA-15 with different PW loadings from 2.7 wt% to 8.3 wt% were prepared. It was observed high catalytic activity with low amount of tungstophosphoric acid immobilized on SBA-15.In order to optimize the reaction conditions, the effect of different parameters, such as catalyst loading, carbon length of the alcohol and temperature, molar ratio of fatty acid to methanol in the presence of PW3-SBA-15 were studied.PW3-SBA-15 catalyst can be separated from reaction system for re-use. It was observed a small leaching of the PW from SBA-15 to liquid phase.PW3-SBA-15 catalyst was also used in the esterification of stearic and oleic acid with methanol. High catalytic activity was observed.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (29 K)Download as PowerPoint slideResearch highlights▶ Esterification of free fatty acids with methanol were carried out over heteropolyacids immobilized on SBA-15. ▶ High heteropolyacid dispersion on SBA-15 was obtained. ▶ High catalytic activity with low amount of tungstophosphoric acid immobilized on SBA-15 was observed.

Keywords
Biodiesel; Heteropolyacids; Esterification; Free fatty acids; SBA-15
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Esterification of free fatty acids to biodiesel over heteropolyacids immobilized on mesoporous silica
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 390, Issues 1–2, 20 December 2010, Pages 183–189
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us