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DRIFTS study of methanol adsorption on Mg–Al hydrotalcite catalysts for the transesterification of vegetable oils

Paper ID Volume ID Publish Year Pages File Format Full-Text
50997 46824 2012 5 PDF Available
Title
DRIFTS study of methanol adsorption on Mg–Al hydrotalcite catalysts for the transesterification of vegetable oils
Abstract

Mg–Al hydrotalcites rehydrated after calcination are promising catalysts for the methanolysis of vegetable oils. To gain insight into the basis of their catalytic action, the adsorption of methanol over some commercial Mg–Al hydrotalcites was studied by diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). Different species formed after methanol adsorption were identified, being the total quantity of methoxy species related to the basic character of the sample. A linear correlation between the amount of adsorbed monodentate methoxy species and the catalytic activity in the biodiesel production was found. Therefore, it is proposed that these species are the mainly involved in the transesterification reaction.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A correlation was found between monodentate methoxy species and methanolysis activity. ► Monodentate methoxy species are involved in methanolysis over Mg–Al hydrotalcites. ► Bidentate methoxy species are strongly adsorbed and less labile than monodentate ones. ► As the Al content increases the likelihood of forming bidentate species is higher. ► Mg/Al ratio and hydration state are key for the hydrotalcites methanolysis activity.

Keywords
Biodiesel; DRIFTS; Hydrotalcite; Methanolysis; Transesterification
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DRIFTS study of methanol adsorption on Mg–Al hydrotalcite catalysts for the transesterification of vegetable oils
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 17, 5 January 2012, Pages 189–193
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