Patent ID: 7371358

Claim:
An oxidation/reduction catalyst composition for the oxidation of CO and hydrocarbons and the reduction of NO X in gaseous environments at temperatures of from about 200° C. to about 500° C. comprising: from about 70.0% to about 98.9% weight percent, based on the total weight of the catalyst, a metal oxide possessing more than one oxidation state; from about 0.1 to about 15.0 weight percent, based on the total weight of the catalyst, of at least two precious metals, wherein: one precious metal is ruthenium, and at least one of the precious metals is chosen from the group consisting of platinum, palladium, gold, rhodium and silver; and from about 1.0 percent to about 15.0 percent of total promoter metal oxide based on the weight of the catalyst, of at least one promoter selected from the group consisting of Fe 2 O 3 , NiO, Co 2 O 3 and WO 3 .