NO.sub.x decomposition catalyst and exhaust gas purifier using s

Details NO.sub.x decomposition catalyst and exhaust gas purifier using s NO.sub.x decomposition catalyst and exhaust gas purifier using s

1997-01-24

1998-03-17

Griffin, Walter D.

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

502303, 502304, 502306, 502311, 502314, 502315, 502316, 502318, 502320, 502327, 502328, 502331, 502332, 502341, 502346, 502351, 502354, B01J 2300, B01J 2340, B01J 2358

Patent

active

057286434

ABSTRACT:
The present invention provides an NO.sub.x decomposition catalyst which can decompose NO.sub.x in exhaust gas to decrease the amount of NO.sub.x in exhaust gas and is improved in durability through suppression of thermal decomposition thereof, and an exhaust gas purifier wherein said catalyst is used. This NO.sub.x decomposition catalyst is a compound having a brownmillerite type structure represented by the general formula: A.sub.3-X B.sub.X C.sub.4-Y D.sub.Y O.sub.Z, the carbon content of which compound may be at most 1.25 wt. %. This NO.sub.x decomposition catalyst can be used in an exhaust gas purifier applicable to an internal combustion engine.

REFERENCES:
patent: 4921829 (1990-05-01), Ozawa et al.
patent: 5380692 (1995-01-01), Nakatsuji et al.
patent: 5559073 (1996-09-01), Hu et al.
Mori et al, "Influence of Oxygen Ion Conduction on Nitric Oxide Decomposition", J. Am. Ceram. Soc., 77(10):2771-2772 (Aug. 1994).

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