Methods of making highly dispersed substantially uniform cerium

Details Methods of making highly dispersed substantially uniform cerium Methods of making highly dispersed substantially uniform cerium

1998-09-10

2000-03-21

Bos, Steven

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

Catalyst or precursor therefor

Silicon containing or process of making

502263, 502304, 502349, B01J 2100, B01J 2300

Patent

active

060402652

ABSTRACT:
A method of making a unique, promoted support for improved catalysts for conversion of exhaust from internal combustion engines, said support comprising a mixed-metal-oxide promoter containing at least Ce and Zr substantially uniformly dispersed as homogeneous crystallites of less than about 100 .ANG. on a high-surface-area refractory oxide support substrate, comprising dissolving a combination of Ce- and Zr-oxide precursors, and optionally another metal oxide precursor, and a compatible organic depositing agent, slowly heating to transform the depositing agent into a gel-like matrix coating the substrate in which the mixed-metal-oxide precursor compounds are uniformly distributed and thereafter calcining to burn off the organic matrix and form the appropriate oxide morphology.

REFERENCES:
patent: 5597771 (1997-01-01), Hu et al.
patent: 5879645 (1999-03-01), Park et al.

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