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Selective Hydrogenation of Crotonaldehyde over Pt Derived Catalysts

1993; Elsevier BV; Linguagem: Inglês

10.1016/s0167-2991(08)63322-4

2542-6613

Calvin Raab, Martin Englisch, T.B.L.W. Marinelli, Johannes A. Lercher,

Catalysis and Hydrodesulfurization Studies

Abstract The hydrogenation of crotonaldehyde was studied over five catalysts with platinum as the major catalytically active component. The catalytic activity for hydrogenation of the C=O bond decreased in the order PtGa/SiO2>Pt/Ti02>PtSn/TiO2>PtNi/Si02. Pt/SiOa was one order of magnitude less active than the other catalysts investigated and catalyzed only the hydrogenation of the C=C bond. Two different types of sites were concluded to be active for C=O bond hydrogenation, i.e., (i) the metal-oxide-interface (i.e. Pt-TiOx and Pt-GaOx) and (ii) bimetallic moieties as in Pt-Sn and Pt-Ni with a small positive charge on the less noble constituent. Hydrogenation of the C=C bond was concluded to occur primarily on the pure metal surfaces.