Crotonaldehyde hydrogenation on supported gold catalysts

BETIANA CAMPO, SVETLANA IVANOVA, CARLOS GIGOLA, CORINNE PETIT, MARÍA A. VOLPE

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Elsevier

Año: 2007

0920-5861

PROOF Abstract Au/Nb2O5 and Au/CeO2 catalysts were studied for the selective hydrogenation of crotonaldehyde, both in liquid (batch reactor, 4 atm, 60 8C,solvent: isopropanol) and in gas (flow microreactor, 120 8C, atmospheric pressure) phases. Samples were characterized by TPR and XRD andtested for the CO oxidation reaction. Large differences in support reducibility between both catalysts were determined from the TPR results. TheXRD and CO oxidation results demonstrated that the gold particles were lower than 5 nm. The dependence of the selectivity towards crotyl alcoholand of the conversion on time on stream was measured. The niobia-supported catalyst was mainly unselective, the selectivity towards crotyl alcoholvalue being 20% for both liquid and gas phases. The Au/CeO2 catalyst is highly selective in gas phase (78% of selectivity towards crotyl alcohol).Under liquid phase conditions, a high selectivity level was not reached mainly due to secondary reaction. # 2007 Published by Elsevier B.V. Keywords: Gold catalyst; Ceria; Niobia; Selective hydrogenation; Crotonaldehyde