期刊
CARBOHYDRATE RESEARCH
卷 341, 期 18, 页码 2946-2953出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carres.2006.10.013
关键词
xylose; furfural; dehydration; solid acid catalysis; cesium salts; heteropolyacid; 12-tungstophosphoric; mesoporous silicas; MCM-41
Cesium salts of 12-tungstophosphoric acid, CsxH3-xPW12O40 (CSx,PW), in the bulk form or supported on medium-pore MCM-41 (3.7 nm) or large-pore (9.6 nm) micelle-templated silicas are active solid acid catalysts for the cyclodehydration of xylose into furfural, in a toluene/water solvent system (T/W) or in dimethyl sulfoxide (DMSO). The catalytic results are comparable to those obtained using sulfuric acid, under similar reaction conditions. The initial activities increase in the order H3PW12O40 < Cs2.0PW < Cs2.5PW < silica-supported CsPW catalysts (15, 34 wt % PW). Higher HPA loadings, larger pore diameter of the parent silica support, and higher reaction temperatures lead to higher furfural yields. The stability and reusability of the MCM-41-supported CsPW is higher in DMSO than in T/W. (c) 2006 Elsevier Ltd. All rights reserved.
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