Doubly promoted catalyst with high geometric surface area

Details Doubly promoted catalyst with high geometric surface area Doubly promoted catalyst with high geometric surface area

1983-10-17

1985-04-09

Shine, W. J.

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

4232135, 502527, B01J 2104, B01J 2310, B01J 2358, B01J 3504

Patent

active

045102627

ABSTRACT:
An extrudate catalyst suitable for auto emission control is made from a solid, transitional aluminia with a partially hollow interior. Deposited on the extrudate are two promoters, ceria and an alkali metal, and one or more platinum group metals. The preferred alkali metal is in the oxide form as lithia. The cylindrical extrudate has internal reinforcing vanes or ribs extending from the inner wall to the center of the extrudate particle. This configuration permits the catalyst to have the large geometric surface area per reactor volume yet, because of the openings inside the extrudate, the catalyst particles do not exhibit a large pressure drop when packed in a deep bed. These catalysts provide greater hydrocarbon and carbon monoxide conversions than do similar size spherical particles and they have improved light-off characteristics.

REFERENCES:
patent: 2408164 (1946-09-01), Foster
patent: 3907710 (1975-09-01), Lundsager
patent: 3932309 (1976-01-01), Graham et al.
patent: 3966644 (1976-06-01), Gustafson
patent: 4089941 (1978-05-01), Villemin
patent: 4233187 (1980-11-01), Atwood et al.
patent: 4369132 (1983-01-01), Kinoshita et al.
patent: 4391740 (1983-07-01), Gibson
patent: 4394303 (1983-07-01), Gibson
Knight Tower Packings published by Koch Engineering Company, Inc., Maurice A. Knight Division.

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