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

resumo

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.

palavras-chave

LIQUID-PHASE DEHYDRATION; HETEROPOLY COMPOUNDS; TUNGSTOPHOSPHORIC ACID; MESOPOROUS SILICA; SOLID ACIDS; MAS-NMR; CSXH3-XPW12O40; MCM-41; ALKYLATION; H3PW12O40

categoria

Biochemistry & Molecular Biology; Chemistry

autores

Dias, AS; Lima, S; Pillinger, M; Valente, AA

nossos autores

Partilhe este projeto

Publicações similares

Usamos cookies para atividades de marketing e para lhe oferecer uma melhor experiência de navegação. Ao clicar em “Aceitar Cookies” você concorda com nossa política de cookies. Leia sobre como usamos cookies clicando em "Política de Privacidade e Cookies".