Catalyst Oxide Support Oxide Interaction to Prepare Multifunctional Oxidation Catalysts

Abstract

Working mechanism of multicomponent bismuth molybdate catalyst system was investigated by surface and structural analysis of the catalysts and activity tests and 18 O tracer experiments in the oxidation of propylene to acrolein. The results obtained with model catalysts, Bi 2 Mo 3 O 12 supported on cobalt molybdate with or without iron molybdate clearly show the importance of the strong interaction between the catalyst oxide and support oxide for the preparation of active catalyst systems. A concept of multifunctional system including the transportation of active oxygen species through the bulk diffusion of oxide ion and different kinds of active site for the activation of dioxygen as well as the consecutive dehydrogenation and oxygenation of hydrocarbon molecule is presented for the design of the effective oxidation catalyst.