Catalyst compositions and methods of making same

Details Catalyst compositions and methods of making same Catalyst compositions and methods of making same

B - Operations, Transporting

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B01J 21/04 (2006.01) B01D 53/94 (2006.01) B01J 23/40 (2006.01) B01J 23/56 (2006.01) B01J 23/63 (2006.01) B01J 37/02 (2006.01) F02B 1/04 (2006.01)

Patent

CA 1295600

ABSTRACT OF THE DISCLOSURE A method of making a catalyst composition comprising an activated alumina coating stabilized against thermal de- gradation 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-rhod- ium platinum group metal catalytic components, e.g., platin- um, optionally, are dispersed. A separate aspect of the in- vention provides for a method of making a catalyst composi- tion including dispersing one or more platinum group metal catalytic components on an activated alumina and calcining the combined alumina and platinum group metal catalytic components. The steps are carried out under limited acidi- fication conditions whereby at least minimum dispersions of the platinum group metal catalytic components are attained. The invention also provides for catalyst compositions re- sulting from either or both the foregoing methods.

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