Exhaust emission purifying catalyst device

Details Exhaust emission purifying catalyst device Exhaust emission purifying catalyst device

2008-03-18

2008-03-18

Griffin, Walter D. (Department: 1743)

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Waste gas purifier

C422S180000

Reexamination Certificate

active

07344684

ABSTRACT:
There is provided an exhaust emission purifying catalyst device which is comprised of a carrier disposed in an exhaust passage and including through holes passed through the carrier in an axial direction (flowing direction), and supporting layers made of fire-resistance inorganic oxide formed on inner surfaces of the through holes. The supporting layers support noble metal and NOxtrapping agents which occlude NOxin exhaust gas when the exhaust air-fuel ratio is lean, and emits and reduces the occluded NOxwhen the exhaust air-fuel ratio is stoichiometric or rich. The amount of the supported noble metal is set to be smaller in an exhaust passage upstream area of the carrier than in an exhaust passage downstream area of the carrier.

REFERENCES:
patent: 4118199 (1978-10-01), Volker et al.
patent: 6149877 (2000-11-01), Ogai
patent: 19522913 (1996-01-01), None
patent: 11-2114 (1999-01-01), None
patent: 2000-27677 (2000-01-01), None
patent: 2001-190960 (2001-07-01), None

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