Lactic acid esterification on titania-silica binary oxides

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Title:	Lactic acid esterification on titania-silica binary oxides
Authors:	Li, K.-T.;Tsai, L.-D.;Wu, C.-H.;Wang, I.
Contributors:	Chemical and Materials Engineering, Tunghai University
Date:	2013
Issue Date:	2014-05-30T02:02:24Z (UTC)
Abstract:	Lactic esters were synthesized with good yields by the reaction between lactic acid and n-butanol/ethanol over titania-silica binary oxides. These catalysts had various atomic ratios and were prepared by a coprecipitation method. XRD, n-butylamine adsorption, nitrogen adsorption, and SEM/EDS were used to characterize the oxides. In general, the turnover frequency for ester formation increased with increasing Ti content. However, the catalyst with Ti/Si atomic ratio = 1/3 (TS13) exhibited the highest ester yield (92.3%) because it had the largest surface area and the greatest amount of acid sites. The optimum Ti/Si atomic ratio for esterification is different from that (Ti/Si ∼ 9/1) reported previously for alkene isomerization. For lactic acid esterification, different optimum catalyst compositions were observed for Ti-Si, Ti-Al, and Ti-Zr mixed oxides (the best Ti/M atomic ratios = 1/3, 1/1, and 3/1 when M = Si, Al, and Zr, respectively), which might be caused by the electronegativity and acid strength differences. ? 2013 American Chemical Society.
Relation:	Industrial and Engineering Chemistry Research,Vol.52,Issue13,P.4734-4739
Appears in Collections:	[化學工程與材料工程學系所] 期刊論文

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