Aqueous-phase dehydration of xylose to furfural in the presence of MCM-22 and ITQ-2 solid acid catalysts
authors Antunes, MM; Lima, S; Fernandes, A; Pillinger, M; Ribeiro, MF; Valente, AA
nationality International
journal APPLIED CATALYSIS A-GENERAL
author keywords Xylose; Furfural; Acid dehydration; MCM-22 zeolite; ITQ-2
keywords 12-TUNGSTOPHOSPHORIC ACID; SELECTIVE PREPARATION; ZEOLITE; TRANSFORMATION; CONVERSION; MECHANISM; ADSORPTION; PRECURSOR; BENZENE
abstract The H-MCM-22 zeolite possessing an MWW (medium-pore) framework and its delaminated counterpart. ITQ-2, with enhanced external surface area, are effective and recyclable solid acid catalysts in the batch-wise, aqueous-phase dehydration of xylose, at 170 degrees C. Up to 71% furfural (Fur) yield is reached at 98% conversion using a biphasic aqueous-organic solvent system (for the simultaneous extraction of Fur); using solely water as the solvent gives up to 54% Fur yield at 97% conversion. Sulfuric acid, used in an approximately equivalent amount to the total acid site concentration of the solid acids, gave 55% Fur yield at 93% conversion. Decreasing the Si/Al ratio of H-MCM-22 zeolite improves the acid properties and consequently the catalytic activity, without affecting significantly the Fur selectivity. While the delamination process considerably enhanced the external surface area of ITQ-2 in comparison to H-MCM-22, it caused modifications in the acid properties, leaving the two prepared materials with the same Si/Al atomic ratio of 24, on a comparable footing in terms of catalytic performance in the studied catalytic reaction. Nevertheless, these solid acid catalysts are fairly stable (similar Fur yields are reached in recycling runs; no structural modifications and no leaching phenomena were detected). (C) 2012 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0926-860X
year published 2012
volume 417
beginning page 243
ending page 252
digital object identifier (doi) 10.1016/j.apcata.2011.12.046
web of science category Chemistry, Physical; Environmental Sciences
subject category Chemistry; Environmental Sciences & Ecology
unique article identifier WOS:000301913900029
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