Catalyst for low temperature emission control and methods for using same

Abstract

The invention provides a composite catalyst containing a first component and a second component. The first component contains a ternary mixed metal oxide. The second component contains a platinum group metal. The composite catalyst is useful for catalyzing the low temperature oxidation of carbon monoxide and hydrocarbons.

1 . A composite catalyst comprising:
 a. a first component comprising a ternary mixed metal oxide; and   b. a second component comprising a platinum group metal.   
     
     
         2 . A composite catalyst according to  claim 1 , wherein the composite catalyst catalyzes the oxidation of CO to CO 2  at or around 150° C. 
     
     
         3 . A composite catalyst according to  claim 1 , wherein the platinum group metal is selected from the group consisting of ruthenium, rhodium, palladium, osmium, iridium, platinum, and combinations thereof. 
     
     
         4 . A composite catalyst according to  claim 1 , wherein the ternary mixed metal oxide comprises cerium oxide. 
     
     
         5 . A composite catalyst according to  claim 1 , wherein the ternary mixed metal oxide comprises copper oxide. 
     
     
         6 . A composite catalyst according to  claim 1 , wherein the ternary mixed metal oxide comprises cobalt oxide. 
     
     
         7 . A component in an exhaust system in an engine comprising the composite catalyst of  claim 1 . 
     
     
         8 . An emission control system comprising the composite catalyst of  claim 1 . 
     
     
         9 . A motor vehicle comprising the composite catalyst of  claim 1 .