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Selective epoxidation of methyl soyate over alumina-supported group VI metal oxide catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
41578 45893 2011 10 PDF Available
Title
Selective epoxidation of methyl soyate over alumina-supported group VI metal oxide catalysts
Abstract

Epoxidation of methyl soyate (biodiesel), soybean oil and oleic acid with tert.-butyl hydroperoxide (TBHP) was investigated over γ-alumina-supported group VI metal oxides (CrOx/Al2O3, MoOx/Al2O3 and WOx/Al2O3) prepared by impregnation method. The studies revealed that 15 wt% MoOx on γ-Al2O3 was the most active catalyst (conversion >90 mol% under optimized conditions). While MoOx/Al2O3 is selective mainly for epoxidation, the other catalysts are active for epoxidation as well as for decomposition of TBHP. The active species on the catalyst surface were investigated using in situ UV–visible spectroscopy. A linear correlation was observed between epoxidation activity and surface acidity of the catalyst. A new1H NMR method was developed to monitor the progress of epoxidation reaction which was found to be superior to gas chromatographic method in estimating the conversion of double bonds of fatty compounds.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (151 K)Download as PowerPoint slideHighlights► Selective epoxidation of methyl soyate over Al2O3-supported group VI metal oxides. ► High conversion (>90%) with 100% epoxide selectivity was obtained over MoOx/Al2O3. ► A new, 1H NMR method is reported to monitor the progress of epoxidation reaction. ► Active sites and structure–activity correlations are reported.

Keywords
Epoxidation; Alumina-supported group VI metal oxides; MoOx/Al2O3; Fatty acids; Vegetable oil; Biodiesel; 1H NMR spectroscopy
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Selective epoxidation of methyl soyate over alumina-supported group VI metal oxide catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 401, Issues 1–2, 15 July 2011, Pages 189–198
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
Online Support
Any Questions? feel free to contact us