Int. J. Mol. Sci. 2009, 10(1), 213-220; doi:10.3390/ijms10010213
Article

Extrudate versus Powder Silica Alumina as Support for Re2O7 Catalyst in the Metathesis of Seed Oil-Derivatives – A Comparison

Department of Chemistry, North-West University P/Bag X2046 Mafikeng, South Africa
Received: 16 September 2008; in revised form: 26 December 2008 / Accepted: 29 December 2008 / Published: 8 January 2009
(This article belongs to the Section Material Sciences and Nanotechnology)
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Abstract: Self- and cross-metathesis of fatty acid methyl esters (FAMEs) was investigated using a silica alumina supported Re2O7 catalyst. Although a 3 wt% Re2O7/SiO2-Al2O3/SnBu4 is already active for the metathesis of unsaturated FAMEs, the results have shown that particle size of silica alumina support has a profound influence on its activity and selectivity. Consequently, high substrate conversions coupled with improved product yields (for mono- and diesters) and reaction rates were obtained upon using powder, as opposed to extrudate silica alumina as the support material. Diesters are platform compounds for the synthesis of polymers and fragrances. In this paper a comparative outline of the influence of particle size of silica alumina (extrudate versus powder) on catalytic performance of a 3 wt% Re2O7/SiO2-Al2O3/SnBu4 for self- and cross-metathesis of FAMEs is made. Low surface area and diffusion constraints associated with extrudates were identified as some of the factors leading to low catalytic activity and selectivity.
Keywords: Olefin metathesis; extrudate silica alumina; powder silica alumina; 3wt% Re2O7/SiO2-Al2O3/SnBu4

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MDPI and ACS Style

Marvey, B.B. Extrudate versus Powder Silica Alumina as Support for Re2O7 Catalyst in the Metathesis of Seed Oil-Derivatives – A Comparison. Int. J. Mol. Sci. 2009, 10, 213-220.

AMA Style

Marvey BB. Extrudate versus Powder Silica Alumina as Support for Re2O7 Catalyst in the Metathesis of Seed Oil-Derivatives – A Comparison. International Journal of Molecular Sciences. 2009; 10(1):213-220.

Chicago/Turabian Style

Marvey, Bassie B. 2009. "Extrudate versus Powder Silica Alumina as Support for Re2O7 Catalyst in the Metathesis of Seed Oil-Derivatives – A Comparison." Int. J. Mol. Sci. 10, no. 1: 213-220.

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