Heat resistant metallic oxide catalyst for reducing pollution em

Details Heat resistant metallic oxide catalyst for reducing pollution em Heat resistant metallic oxide catalyst for reducing pollution em

1998-04-02

2000-08-22

Bell, Mark L.

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

502303, 502304, 502324, 502333, 502339, 502349, 502351, 502355, 502327, 502524, 502525, 50252711, 50252715, 50252724, 502500, 502415, 428640, 428652, 428668, 428669, 428671, B01J 2300, B01J 2342, B32B 1500, B32B 1501

Patent

active

061072397

ABSTRACT:
The present invention discloses an exhaust gas catalyst for reducing the pollutant release containing in the exhaust gas. The catalyst includes a primary-core support carrier composed of gamma-phase aluminum oxide. The core-carrier is coated with Y.sub.2 O.sub.3 and ZrO.sub.2 such that the heat resistance is greatly improved. A two-layer active catalytic structure is formed over the core-carrier. An inner catalytic layer is formed with composition active catalytic elements with approximate weight ratios of La:Ce:Mn:Co:Pd:=10-15:10-15:6-10:6-10:0.1-0.3. An outer catalytic layer is then coated over the inner catalytic layer. The outer catalytic layer comprises catalytic active elements. The weight ratio of the active catalytic elements are Y:La:Zr:Cu:Cr:V:Pd:=1-3:2-6:2-6:6-10:10-15:2-6:0.1-0.3.

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