E.i. Dupont De Nemours and Company

Elrey L McCann, Iii

Alan Lauder

Catalytic activity of metal oxides is enhanced through application of the metal oxide to a second metal oxide having a perovskite crystal structure.

Catalytic perovskites on perovskite supports and process for preparing

Metal oxyhalides of the general formula ABO.sub.3-f X.sub.f having perovskite-type crystal structures in which A and B are each cations of at least one metal and a portion of the type B cations are catalytically active; X is fluoride or chloride; and f is about from 0.01 to 1.0; useful for the promotion of oxidation and reduction reactions, including those involved in the cleanup of exhaust gases of internal combustion engines.

Metal oxyhalide catalytic compositions

Oxidation and reduction reactions using metal oxyhalide catalysts of the general formula ABO.sub.3.sub.-f X.sub.f having perovskite-type crystal structures in which A and B are each cations of at least one metal and a portion of the type B cations are catalytically active; X is fluoride or chloride; and f is about from 0.01 to 2.5.

Metal oxyhalide catalyzed reactions

Catalysts useful for oxidizing carbon monoxide and other volatile carbon compounds and for reducing nitrogen oxides are prepared by heating reactive alumina impregnated with ions of a platinum metal, a lanthanide metal, and at least one alkali or alkaline earth metal in amounts which promote substantially complete incorporation of the platinum metal into an aluminum-containing complex metal oxide of the empirical formula ABO.sub.3.

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Wilmington, DE, United States of America

Elrey L McCann, Iii