Catalytic dehydration of xylose to furfural: vanadyl pyrophosphate as source of active soluble species
authors Sadaba, I; Lima, S; Valente, AA; Granados, ML
nationality International
journal CARBOHYDRATE RESEARCH
author keywords Xylose; Furfural; Acid catalysis; Vanadyl pyrophosphate; Homogeneous catalysis
keywords LIQUID-PHASE DEHYDRATION; N-BUTANE OXIDATION; SOLID ACID CATALYSTS; SELECTIVE OXIDATION; MALEIC-ANHYDRIDE; PHOSPHATE CATALYSTS; REACTIVITY; TEMPERATURE; PERFORMANCE; CONVERSION
abstract The acid-catalysed, aqueous phase dehydration of xylose (a monosaccharide obtainable from hemicelluloses, e.g., xylan) to furfural was investigated using vanadium phosphates (VPO) as catalysts: the precursors, VOPO4 center dot 2H(2)O. VOHPO4 center dot 0.5H(2)O and VO(H2PO4)(2), and the materials prepared by calcination of these precursors, that is, gamma-VOPO4, (VO)(2)P2O7 and VO(PO3)(2), respectively. The VPO precursors were completely soluble in the reaction medium. In contrast, the orthorhombic vanadyl pyrophosphate (VO)(2)P2O7, prepared by calcination of VOHPO4 center dot 0.5H(2)O at 550 degrees C/2 h, could be recycled by simply separating the solid acid from the reaction mixture by centrifugation, and no drop in catalytic activity and furfural yields was observed in consecutive 4 h-batch runs (ca. 53% furfural yield, at 170 degrees C). However, detailed catalytic/characterisation studies revealed that the vanadyl pyrophosphate acts as a source of active water-soluble species in this reaction. For a concentration of(VO)(2)P2O7 as low as 5 mM, the catalytic reaction of xylose (ca. 0.67 M xylose in water, and toluene as solvent for the in situ extraction of furfural) gave ca. 56% furfural yield, at 170 degrees C/6 h reaction. (C) 2011 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0008-6215
year published 2011
volume 346
issue 17
beginning page 2785
ending page 2791
digital object identifier (doi) 10.1016/j.carres.2011.10.001
web of science category Biochemistry & Molecular Biology; Chemistry, Applied; Chemistry, Organic
subject category Biochemistry & Molecular Biology; Chemistry
unique article identifier WOS:000298274200018
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journal impact factor 2.074
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