Exhaust emission control catalyst and process for producing the

Details Exhaust emission control catalyst and process for producing the Exhaust emission control catalyst and process for producing the

1997-08-28

1999-12-28

Caldarola, Glenn

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

502 71, 502 77, B01J 2104, B01J 2112, B01J 2906, B01J 2940

Patent

active

060081554

ABSTRACT:
An exhaust emission control catalyst having an excellent NOx converting capability includes a modified alumina which has a .theta.-phase and an .alpha.-phase and has an .alpha.-conversion rate R in a range of 0.5 %.ltoreq.R.ltoreq.95 %, and a catalytic metal carried in the modified alumina, e.g., platinum (Pt). In addition, a catalyst including a catalyst material which is the above-described catalyst including the modified alumina and the catalytic metal, and an aluminosilicate or cerium oxide (CeO.sub.2), also has an excellent NOx converting capability.

REFERENCES:
patent: 4172047 (1979-10-01), Gandhi et al.
patent: 4619909 (1986-10-01), Ono et al.
patent: 5248650 (1993-09-01), Sekiba et al.
patent: 5427989 (1995-06-01), Kanesaha et al.
JP 800163728 Abstract in English, 1980 no month.
JP 780133147 Abstract in English, 1978 no month.

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