Catalyst compositions and methods of making the same

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

1986-06-27

1988-02-23

Davis, Curtis R.

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

502304, 502328, 502332, 502333, 502334, 502339, 502341, 502351, 502355, 502439, 502527, B01J 2104

Patent

active

047270527

ABSTRACT:
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, including a high purity bulk ceria on which one or more non-rhodium platinum group metal catalytic components, e.g., platinum, optionally, are dispersed. A separate aspect of the invention provides for a method of making a catalyst composition 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 acidification conditions whereby at least minimum dispersions of the platinum group metal catalytic components are attained. The invention also provides for catalyst compositions resulting from either or both the foregoing methods.

REFERENCES:
patent: 3554929 (1971-01-01), Aarons
patent: 3993572 (1976-11-01), Hindin et al.
patent: 4294726 (1981-10-01), Bozon et al.
patent: 4367162 (1983-01-01), Fujitani et al.
patent: 4407735 (1983-10-01), Sawamura
patent: 4438219 (1984-03-01), Brandenburg et al.
patent: 4442024 (1984-04-01), Crone, Jr.
patent: 4492770 (1985-01-01), Blanchard et al.
patent: 4504598 (1985-03-01), Ono et al.
patent: 4619909 (1986-10-01), Ono et al.

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