Catalyst supports having promoter oxide gradient, resulting cata

Details Catalyst supports having promoter oxide gradient, resulting cata Catalyst supports having promoter oxide gradient, resulting cata

1990-10-17

1992-04-07

Shine, W. J.

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

Catalyst or precursor therefor

Silicon containing or process of making

502302, 502303, 502304, 502325, 502328, 502339, 502439, 4232135, B01J 2106, B01J 2310, B01J 2358, B01J 2364

Patent

active

051028506

ABSTRACT:
Catalysts which are suitable for auto exhaust use are made with a promoter oxide that is deposited in a concentration gradient. A solution of the promoter oxide precursor, e.g., cerous nitrate solution, is impreganted uniformly into the pore structure of a support which can be in the form of beads or extrudates to a level just below the full incipient wetness. The impregnated support is then treated with a gaseous base such as ammonia, under dynamic conditions such as tumbling (to insure uniformity), which causes the precipitation of the promoter oxide in the form of a radial concentration gradient. The resulting product is then dried and calcined at sufficiently high temperature to effect complete conversion of the promoter precursor to its oxide form, e.g., CeO.sub.2.

REFERENCES:
patent: 4136063 (1979-01-01), Kimura et al.
patent: 4374047 (1983-02-01), Bozon et al.
patent: 4591580 (1986-05-01), Kim et al.

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