Catalyst for purifying exhaust gas and process for producing the

Details Catalyst for purifying exhaust gas and process for producing the Catalyst for purifying exhaust gas and process for producing the

1997-11-12

2000-02-15

Wood, Elizabeth D.

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

502325, 502326, 502327, 502328, 502330, 502332, 502333, 502334, 502339, 502340, 502341, 502344, 502347, 502348, 50252715, 50252724, 428357, 428402, 428403, 428404, 428446, 428448, 428688, 428689, 428699, 428701, 428702, B01J 2300, B01J 2338, B01J 2340, B01J 2342

Patent

active

060252979

ABSTRACT:
A catalyst for purifying an exhaust gas includes a core, and a catalyst ingredient loading layer. The core includes a first support, and an NO.sub.x storage member involved in the first support. The catalyst ingredient loading layer includes a second support and a noble metal catalyst ingredient involved in the second support, and is formed on the core. The catalyst ingredient loading layer keeps SO.sub.x, included in the exhaust gas, from reaching the core. Hence, the NO.sub.x storage member is inhibited from being poisoned by sulfur. The NO.sub.x storage member is separated from the noble metal catalyst ingredient. Therefore, the noble metal catalyst ingredient is inhibited from sintering.

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