Acidic cesium salts of 12-tungstophosphoric acid as catalysts for the dehydration of xylose into furfural

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• 作者：Ana S. Dias ; Sé ; rgio Lima ; Martyn Pillinger ; Anabela A. Valente
• 关键词：Xylose ; Furfural ; Dehydration ; Solid acid catalysis ; Cesium salts ; Heteropolyacid ; 12-Tungstophosphoric ; Mesoporous silicas ; MCM-41
• 刊名：Carbohydrate Research
• 出版年：2006
• 期刊代码：15_00086215
• 类别：ch
• 出版时间：29 December 2006
• 卷：341
• 期：18
• 页码：2946-2953
• 文件大小：282 K

摘要

Cesium salts of 12-tungstophosphoric acid, Cs_xH_3"12;xPW₁₂O₄₀ (Cs_xPW), 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 < Cs_2.0PW < Cs_2.5PW < 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.