Catalyst for purifying exhaust gas

Details Catalyst for purifying exhaust gas Catalyst for purifying exhaust gas

1996-02-26

1998-12-15

Lewis, Michael L.

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

502304, 502326, B01J 2344, B01J 2346, B01J 2375

Patent

active

058496602

ABSTRACT:
A catalyst (3) for purifying an automotive exhaust gas, in which inner and outer catalytic layers (5,6), each of which has a base material and a catalytic material held by the base material, are stratified on a honeycomb-type carrier (4). In the catalyst (3), the inner catalytic layer (5) contains a palladium component as the catalytic component. Further the inner catalytic layer (5) contains a nickel oxide component for preventing poisoning of the palladium component. On the other hand, though the outer catalytic layer (6) contains a rhodium component as the catalytic component, it does not contain a palladium component nor a nickel oxide component.

REFERENCES:
patent: 4006103 (1977-02-01), Meguerian et al.
patent: 4239656 (1980-12-01), Fujitani et al.
patent: 4492769 (1985-01-01), Blanchard et al.

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