Mesoporous sulfonic acids as selective heterogeneous catalysts for the synthesis of monoglycerides

被引:297
作者
Bossaert, WD [1 ]
De Vos, DE [1 ]
Van Rhijn, WM [1 ]
Bullen, J [1 ]
Grobet, PJ [1 ]
Jacobs, PA [1 ]
机构
[1] Katholieke Univ Leuven, Ctr Surface Sci & Catalysis, B-3001 Heverlee, Belgium
关键词
esterification; monoglycerides; mesoporous materials; sulfonic acids;
D O I
10.1006/jcat.1998.2353
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Glycerol was esterified with an equimolar amount of lauric acid to monolaurin using zeolites, sulfonic resins, and sulfonic mesoporous materials as catalysts. The latter were obtained by immobilization of 3-mercaptopropyl groups and oxidation with H2O2. In particular, fatty acid conversions, monoglyceride yields, and selectivities obtained with mesoporous (ordered, amorphous) sulfonic catalysts were compared with those of other heterogeneous or homogeneous catalysts. When using silica gel coated with propylsulfonic acids, high reaction rates are coupled to high monoglyceride yields, e.g., 53% mono yield for a 1:1 glycerol:lauric acid ratio. Minimizing the autocatalytic contribution of the fatty acid reactant is a critical issue. The influence of a number of reaction parameters is investigated. The mesoporous sulfonic catalysts are also employed in the esterification of propanediols and meso-erythritol, and for reactions with other fatty acids. (C) 1999 Academic Press.
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页码:156 / 164
页数:9
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