PHASE-COMPOSITION AND CATALYTIC PROPERTIES OF OXIDE MULTICOMPONENT MOLYBDENUM-CONTAINING CATALYSTS FOR PARTIAL PROPENE OXIDATION

The catalytic properties and phase composition of multicomponent molyb denum-containing catalysts treated under various oxidative-reductive c onditions are studied. The phase composition is studied by X-ray phase analysis and the reference-free differentiating dissolution (DD) tech niques. With the aid of the DD method, the data on the elemental compo sition, stoichiometry, and content of the complex molybdate phases are obtained for the first time. The data on the modification of the main phases of the catalyst, cobalt and iron molybdates, by other cations entering the molybdate composition allows one to suggest that the mech anism of catalysis by a multicomponent catalyst is determined by the p roperties of one or several doped phases which exhibit all the functio ns of an effective catalyst.