Catalyst for cleaning exhaust gas with alumina, ceria, zirconia,

Details Catalyst for cleaning exhaust gas with alumina, ceria, zirconia, Catalyst for cleaning exhaust gas with alumina, ceria, zirconia,

1995-03-17

1996-02-20

McGinty, Douglas J.

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

4232135, B01J 2358, B01J 2363, B01J 3504, B01J 37025

Patent

active

054928788

ABSTRACT:
A catalyst for cleaning exhaust gas comprises a carrier and a coated layer applied onto the surface of the carrier which comprises an aluminum oxide, a cerium oxide, a zirconium oxide, a nickel oxide, an alkaline earth metal oxide and a noble metal catalytic component. The catalyst can be prepared according to a method which comprises the steps of coating the surface of a carrier with a slurry which comprises active alumina, a cerium compound, a zirconium compound and a nickel compound, drying the coated carrier and then calcining it to complete the carrier, then impregnating the carrier with a solution comprising a catalyst component of a noble metal, drying, then immersing it in a solution of an alkaline earth metal compound, drying the immersed carrier and then calcining the carrier. The catalyst for exhaust gas-cleanup is highly sensitive to HC and CO around the theoretical mixing ratio and within the rich-region and is excellent in durability.

REFERENCES:
patent: 4171287 (1979-10-01), Keith
patent: 4294726 (1981-10-01), Bozon et al.
patent: 4965243 (1990-10-01), Yamada et al.
patent: 5008090 (1991-04-01), Joy et al.
patent: 5057483 (1991-10-01), Wan

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