Mesoporous silica-supported 12-tungstophosphoric acid catalysts for the liquid phase dehydration of D-xylose
authors Dias, AS; Pillinger, M; Valente, AA
nationality International
journal MICROPOROUS AND MESOPOROUS MATERIALS
author keywords xylose; furfural; dehydration; acid catalysis; heteropoly acid; mesoporous silicas; catalyst recycling
keywords COMPRISING HETEROPOLY ACID; MOLECULAR-SIEVE; MAS NMR; CLAISEN REARRANGEMENT; ALKYLATION CATALYSTS; ALUMINUM-CHLORIDE; RAW-MATERIALS; SOLID ACIDS; MCM-41; ESTERIFICATION
abstract Hybrid composites comprising 12-tungstophosohoric acid (PW) immobilized in micelle-templated silicas have been prepared and characterized by several techniques, and were shown to possess dehydration activity for the conversion of xylose to furfural in liquid phase. These catalysts exhibit higher activity for xylose dehydration than non-supported PW, and are comparable with H2SO4 in terms of furfural yield achieved after 4 h, under similar reaction conditions (58%). The catalytic performance of the PW-supported catalysts depends on the interplay of several variables, such as the catalyst preparation method, type of support (purely siliceous or aminopropyl-functionalized silicas with different pore sizes), PW loading (15-34 wt.%), and the reaction conditions (temperature 140-160 degrees C, type of solvent - toluene/water (T/W) or dimethylsulfoxide (DMSO)). The stability and reusability of the catalysts was also studied and the best results were obtained in DMSO using either the 15 wt.% PW inorganic composites, or PW immobilized in the aminopropyl-functionalized silicas. Strong host-guest interactions and active site isolation appear to benefit catalytic activity and stability when DMSO is used as the solvent. Catalyst surface passivation plays a significant role. (c) 2006 Elsevier Inc. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 1387-1811
year published 2006
volume 94
issue 1-3
beginning page 214
ending page 225
digital object identifier (doi) 10.1016/j.micromeso.2006.03.035
web of science category Chemistry, Applied; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
subject category Chemistry; Science & Technology - Other Topics; Materials Science
unique article identifier WOS:000240279200028
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