Gas-phase conversion of glycerol to allyl alcohol over vanadium-supported zeolite beta

Almeida, Ruben; Ribeiro, M. Filipa; Fernandes, Auguste; Lourenço, João P.

http://hdl.handle.net/10400.1/12877

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Vanadium oxide supported beta zeolite (Si/Al=25, 4% V) was used as catalyst for the one-pass gas-phase conversion of glycerol to allyl alcohol without any external reductant. The catalytic data strongly suggest a consecutive reactions path involving the dehydration to acrolein over the zeolite acid sites followed by a selective reduction through a hydrogen-transfer reaction. Acidity is expected to play a major role in what concerns the selectivity, as demonstrated by the catalytic results obtained by the impregnation of vanadium on a previously Cs-exchanged sample that achieved ca. 30% selectivity to allyl alcohol at ca. 20% glycerol conversion.