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Development of niobium containing acidic catalysts for glycerol esterification

Paper ID Volume ID Publish Year Pages File Format Full-Text
55391 47050 2012 6 PDF Available
Title
Development of niobium containing acidic catalysts for glycerol esterification
Abstract

Mesoporous silicate and niobiosilicate materials of SBA-15 type were prepared and post-synthesis modified with MPTMS, i.e. (3-mercaptopropyl)trimethoxysilane, followed by oxidation of thiol species. The samples obtained were characterised by different techniques (N2 adsorption/desorption, XRD, elemental and thermal analyses) and applied as catalysts in glycerol esterification with acetic acid. The focus was on the comparison of the role of niobium in the formation of sulphonic species and its stability in the post-synthesis modified materials (prepared within this work) with those, already published, prepared by one-pot synthesis method. The most important finding is that the presence of niobium in the SBA-15 structure improves the efficiency of –SH oxidation by hydrogen peroxide towards sulphonic species like in case of one-pot synthesised samples. However, contrary to the latter samples the presence of niobium does not increase the stability of the modifier (oxidized MPTMS). This has an impact on faster deactivation of samples prepared. Samples prepared with post-synthesis modification exhibit much higher activity in glycerol esterification.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (208 K)Download as PowerPoint slideHighlights► Niobium in the material structure enhances the formation of sulphonic species. ► Stability of sulphonic species does not depend on the chemical composition of SBA-15. ► 40% of selectivity to triacetylglycerol is reached.

Keywords
SBA-15; MPTMS; Niobium; Glycerol esterification; Acetic acid; Biodiesel additives
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Development of niobium containing acidic catalysts for glycerol esterification
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 187, Issue 1, 30 June 2012, Pages 129–134
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