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|Title:||Effects of Acidity and Pore Size Constraints on Supported Niobium Oxide Catalysts for the Selective Formation of Glycerol Monolaurate|
|Citation:||Radhakrishnan, R., Wu, J., Jaenicke, S., Chuah, G.K. (2011-04-11). Effects of Acidity and Pore Size Constraints on Supported Niobium Oxide Catalysts for the Selective Formation of Glycerol Monolaurate. ChemCatChem 3 (4) : 761-770. ScholarBank@NUS Repository. https://doi.org/10.1002/cctc.201000300|
|Abstract:||Supported niobium oxide catalysts with 5-30wt.% Nb2O5 were prepared by grafting niobium ethoxide onto MCM-41 and hydrous zirconia. The supported samples contain Brønsted-acid sites, whereas bulk niobium oxide has predominantly Lewis-acid sites. In the esterification of glycerol with lauric acid, good activity and a high glycerol monolaurate selectivity was achieved when the active niobium oxide phase was coated within the pore channels of an MCM-41 support, which has a mean pore diameter of 2.2nm. Phosphated Nb2O5/MCM-41 showed an even higher activity without any penalty in selectivity, enabling monolaurate yields of 89-90%. Glycerol monolaurate is an important ingredient in the food, pharmaceutical, and cosmetic industries. A key feature of these pore confined catalysts is the sustained high selectivity to monolaurate even at high conversions. In contrast, niobium oxide supported on wide-pored hydrous zirconia showed lower selectivity. The catalysts are active in the solventless esterification of a number of alcohols and acids and can be easily recycled for subsequent batch reactions, making them attractive as green catalysts for sustainable processes. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.|
|Appears in Collections:||Staff Publications|
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