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- W1963532942 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, VOPO4·2H2O, VOHPO4·0.5H2O and VO(H2PO4)2, and the materials prepared by calcination of these precursors, that is, γ-VOPO4, (VO)2P2O7 and VO(PO3)2, respectively. The VPO precursors were completely soluble in the reaction medium. In contrast, the orthorhombic vanadyl pyrophosphate (VO)2P2O7, prepared by calcination of VOHPO4·0.5H2O at 550 °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 °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)2P2O7 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 °C/6 h reaction." @default.
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- W1963532942 date "2011-12-01" @default.
- W1963532942 modified "2023-10-09" @default.
- W1963532942 title "Catalytic dehydration of xylose to furfural: vanadyl pyrophosphate as source of active soluble species" @default.
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- W1963532942 doi "https://doi.org/10.1016/j.carres.2011.10.001" @default.
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