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Synthesis of glycerol carbonates by transesterification of glycerol in a continuous system using supported hydrotalcites as catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
46698 46445 2012 9 PDF Available
Title
Synthesis of glycerol carbonates by transesterification of glycerol in a continuous system using supported hydrotalcites as catalysts
Abstract

MgAl hydrotalcites have been grown onto α- and γ-Al2O3 and characterized by XR diffraction, N2 and CO2 adsorption. XRD patterns show the crystallization of hydrotalcites as nanometric crystals. On the calcined supported materials, the thermal desorption of CO2 evidences the presence of relatively strong basic sites which are absent on the pure supports. The samples supported by α-Al2O3 exhibit a higher basic strength than those supported on γ-Al2O3. After rehydration, the total number of sites changes only little, but the original sites, presumed to be of Lewis type are converted to stronger Brønsted sites. The synthesis of glycerol carbonate and dicarbonate has been performed by transesterification of glycerol by diethyl carbonate in a green, efficient and selective process catalyzed by these hydrotalcites supported on α- and γ-Al2O3. The control of grain size of the support allows to operate in a flow reactor, then to evaluate the extent of deactivation as a function of time on stream at full conversion of glycerol. Stable catalysts are obtained when α-Al2O3 is the support.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Hydrotalcites supported by alumina beads as catalyst in continuous reactor. ► Active and stable catalysts in the synthesis of glycerol carbonate. ► Glycerol valorization.

Keywords
Supported hydrotalcite; Glycerol; Glycerol carbonate; Transesterification; Continuous flow reactor; Basicity; Deactivation
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Synthesis of glycerol carbonates by transesterification of glycerol in a continuous system using supported hydrotalcites as catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 113–114, 22 February 2012, Pages 212–220
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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