Catalyst for purifying exhaust gases

Details Catalyst for purifying exhaust gases Catalyst for purifying exhaust gases

1998-11-30

2000-12-12

Griffin, Walter D.

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

502302, 502303, 502304, 502327, 502328, 502332, 502333, 502334, 502341, 502346, 502351, 502411, B01J 2106, B01J 2112, B01J 2302, B01J 2310, B01J 2340

Patent

active

061598976

ABSTRACT:
A catalyst for purifying exhaust gases includes a support including at le one composite selected from the group consisting of TiO.sub.2 --Al.sub.2 O.sub.3, ZrO.sub.2 --Al.sub.2 O.sub.3 and SiO.sub.2 --Al.sub.2 O.sub.3 composites, an NO.sub.x adsorbent including at least one member selected from the group consisting of alkali metals, alkaline-earth metals and rare-earth elements and loaded on the support, and a noble metal catalyst ingredient loaded on the support. The composites constituting the support improve initial NO.sub.x conversion of the catalyst, but also inhibit NO.sub.x purifying performance thereof from degrading even after a durability test.

REFERENCES:
patent: 4157316 (1979-06-01), Thompson et al.
patent: 4220559 (1980-09-01), Polinski
patent: 4440874 (1984-04-01), Thompson
patent: 4791091 (1988-12-01), Bricker et al.
patent: 4919902 (1990-04-01), Bricker et al.
patent: 5575983 (1996-11-01), Suzuki et al.

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