Esterification of glycerol with oleic acid over hydrophobic zirconia-silica acid catalyst and commercial acid catalyst:Optimization and influence of catalyst acidity

Kong, P.S. and Pérès, Y. and Wan Daud, W.M.A. and Cognet, P. and Aroua, M.K. (2019) Esterification of glycerol with oleic acid over hydrophobic zirconia-silica acid catalyst and commercial acid catalyst:Optimization and influence of catalyst acidity. Frontiers in Chemistry, 7. ISSN 2296-2646

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Abstract

Catalytic esterification of glycerol with oleic acid (OA) was optimized over hydrophobic mesoporous zirconia-silica heterogeneous acid catalyst (ZrO 2 -SiO 2 -Me & Et-PhSO 3 H) and benchmarked with commercial catalysts (Aquivion and Amberlyst 15) in order to examine the effect of catalyst acidity on conversion, yield and product selectivity. The process optimisation results showed an 80% conversion with a 59.4% glycerol mono-oleate (GMO) and 34.6% glycerol dioleate (GDO) selectivities corresponding to a combined GMO and GDO selectivity of 94.8% at equimolar OA-to-glycerol ratio, 160°C reaction temperature, 5 wt% catalyst concentration with respect to the OA weight and 4 h reaction time. This work reveals that the hydrophobic and mild acidic ZrO 2 -SiO 2 -Me & Et-PhSO 3 H catalyst outperformed Amberlyst 15 and Aquivion with a yield of 82% and GMO selectivity of 60%. It is found that catalyst acidity is a key parameter for catalytic activity and conversion rate. Nevertheless, high acidity/acid strength reduced the product yield in the glycerol esterification of OA.

Item Type:
Journal Article
Journal or Publication Title:
Frontiers in Chemistry
Subjects:
ID Code:
133709
Deposited By:
Deposited On:
09 May 2019 10:35
Refereed?:
Yes
Published?:
Published
Last Modified:
27 Oct 2020 09:01