Exhaust gas cleaner

Details Exhaust gas cleaner Exhaust gas cleaner

1990-03-15

1991-12-24

Shine, W. J.

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

502302, 502304, 502313, 502324, 502326, 502328, 502330, 502331, 4232155, B01J 2310, B01J 2358, B01J 2372

Patent

active

050752740

ABSTRACT:
An exhaust gas cleaner having a heat-resistant, porous foam-type filter as a carrier, the filter being constituted by two portions consisting of a portion having a relatively low density and a high-density, thin layer portion formed on one side of the low density portion, the low-density portion supporting a base metal catalyst consisting essentially of (a) at least one of alkali metal elements, and (b) one or more elements selected from the group consisting of transition elements (excluding platinum-group elements) and Sn, and the high-density, thin layer portion supporting a platinum-group element catalyst. The base metal catalyst may further contain at least one of rare earth elements. The exhaust gas cleaning method is conducted by using this cleaner with its low-density portion on the exhaust gas inlet or outlet side.

REFERENCES:
patent: 4451441 (1984-05-01), Ernest et al.
patent: 4828807 (1989-05-01), Domesle et al.
patent: 4912076 (1990-03-01), Mizrah et al.

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