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Glycerol-Intercalated Mg-Al Hydrotalcite as a Potential Solid Base Catalyst for Transesterification

Published online by Cambridge University Press:  01 January 2024

Yuanzhou Xi  and
Robert J. Davis
Yuanzhou Xi
Affiliation:
Department of Chemical Engineering, University of Virginia, 102 Engineers’ Way, PO Box 400741, Charlottesville, VA 22904-4741, USA
Robert J. Davis*
Affiliation:
Department of Chemical Engineering, University of Virginia, 102 Engineers’ Way, PO Box 400741, Charlottesville, VA 22904-4741, USA
*
* E-mail address of corresponding author: [email protected]
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Abstract

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Glycerol is a byproduct of biodiesel synthesis by transesterification of triglycerides with short-chain alcohols in the presence of solid base catalysts. Because hydrotalcite is a potentially useful basic catalyst for the transesterification reaction, the interaction of glycerol with hydrotalcite is the focus of this work. Glycerol was intercalated into Mg-Al hydrotalcite with a Mg/Al molar ratio of 4 under elevated temperatures of 4432/503 K in the absence and presence of NaOH. The resulting materials were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, and N2 adsorption. The amount of glycerol incorporated into hydrotalcite increased with increasing temperature of intercalation. However, the brucite-like sheets of hydrotalcite partially decomposed during the intercalation process at the highest temperature. The presence of NaOH stabilized the hydrotalcite layers against decomposition under high temperature (503 K). The intercalated materials exposed large surface areas ranging from 142 to 663 m2 g−1, depending on the preparation conditions. The glycerol-intercalated hydrotalcites were less catalytically active than hydrotalcite with OH− counterions for the transesterification of tributyrin with methanol. The lower reactivity of glycerol-intercalated hydrotalcite was probably the result of a strong interaction between the intercalated glycerolate (HOCH2-CHOH-CH2O−) and the partially decomposed brucite-like sheets.

Keywords

BiodieselCatalystDTGFTIRGlycerolHydrotalciteTGATransesterificationTributyrinXRD
Type
Article
Information
Clays and Clay Minerals , Volume 58 , Issue 4 , August 2010 , pp. 475 - 485
Copyright
Copyright © The Clay Minerals Society 2010

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