Johnson Matthey & Co., Limited

William David Evans

Alan F Diwell

Gary James Acres

Barry John Cooper

Robert J Larbey

Thomas I Stewart

A supported catalyst suitable for catalyzing oxidation and reduction processes in a gas and capable of removing oxygen from a gas containing an excess of oxygen and restoring at least a part of such removed oxygen to a gas having an oxygen deficiency, comprising (A) a substrate; (B) a washcoat on said substrate comprising at least one refractory metal oxide and nickel; and (C) a catalytically active coating attached to said substrate by said washcoat, said catalytically active coating comprising at least one of the precious metals platinum, rhodium, ruthenium, palladium, iridium, osmium, gold and silver.

Catalysts

This invention relates to catalyst for use in the control of atmospheric pollution and, in particular to the purification of exhaust gases from internal combustion engines. Specific catalysts of the present invention comprise:

Catalyst

This invention relates to catalyst for use in the control of atmospheric pollution and, in particular, to the purification of exhaust gases from internal combustion engines. Specific catalysts of the present invention comprise: A. ruthenium or an alloy thereof and a metal oxide capable of forming a stable mixed oxide (or 'ruthenite') with ruthenium dioxide; B. a compound formed by ruthenium dioxide and a metal oxide capable of forming a stable mixed oxide (or ruthenite) with ruthenium dioxide; and C. a mixed oxide containing ruthenium, the oxide being selected from the group consisting of oxides of the pyrochlore type A.sub.2 B.sub.2 O.sub.7, the perovskite type ABO.sub.3, the ilmenite type B.sub.2 O.sub.3 and the spinel type AB.sub.2 O.sub.4. Particularly good results have been obtained where the platinum/ruthenium ratio is within the range 25- 95 wt.% platinum and 5 - 75 wt.% ruthenium.

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London, United Kingdom

William David Evans