Catalyst compositions and methods of making same

Abstract From the Canadian patent

A method of making a catalyst composition comprising an activated alumina coating stabilized against thermal degradation includes applying a coating of alumina having one or more platinum group metal catalytic components dispersed thereon onto a carrier substrate and calcining the coating. The calcined coating is then impregnated with a solution of a thermal stabilizer-precursor and calcined again to provide a thermal stabilizer in the alumina. Bulk ceria optionally, an aluminum-stabilized bulk ceria may also be added to the, composition, preferably at specified minimum levels includ-, ing a high purity bulk ceria on which one or more non-rhodium platinum group metal catalytic components …