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Transesterification of rapeseed oil with ethanol over heterogeneous heteropolyacids

Paper ID Volume ID Publish Year Pages File Format Full-Text
51697 46850 2008 6 PDF Available
Title
Transesterification of rapeseed oil with ethanol over heterogeneous heteropolyacids
Abstract

Heterogeneized heteropolyacids, H3PW12O40/SiO2 and Cs2HPW12O40 were shown to catalyze rapeseed oil transesterification with ethanol in mild conditions. The number and the strength of the acid sites were evaluated by calorimetry. Over anhydrous H3PW12O40 and Cs2HPW12O40, acid sites of homogeneous strength with heat of ammonia adsorption near 200 kJ mol−1 were measured. By contrast, H3PW12O40/SiO2 showed sites of lower strength with a heterogeneous distribution. The catalytic activity did not correlate the acid strength of solid catalysts. Indeed, equivalent TOF were determined on H3PW12O40 and silica supported H3PW12O40 while lower TOF were measured on microporous Cs2HPW12O40.The TOF values were interpreted in terms of leaching of the active phase in the case of H3PW12O40/SiO2 while reduced acid sites accessibility might explain the lower TOF measured on Cs2HPW12O40.

Keywords
Biodiesel; Transesterification; Rapeseed oil; Vegetable oil; Heteropolyacids
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Transesterification of rapeseed oil with ethanol over heterogeneous heteropolyacids
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 10, Issue 1, 10 October 2008, Pages 92–97
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