Purifying catalyst for exhaust gas from internal combustion engi

Details Purifying catalyst for exhaust gas from internal combustion engi Purifying catalyst for exhaust gas from internal combustion engi

1996-12-27

2000-11-07

Griffin, Steven P.

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

502333, 4232135, B01J 2310

Patent

active

061436917

ABSTRACT:
A purifying catalyst for the exhaust gas from the internal combustion engine of an automobile, for example, is disclosed which excels in the purifying ability in quick response to the atmosphere of the exhaust gas largely varying with changes in the operating condition of the engine involving such phases as idling, acceleration, constant-speed drive, and deceleration. The purifying catalyst contains rhodium, palladium, a cerium compound, and a refractory inorganic oxide as catalytic components carried on a refractory carrier and comprises at least two catalyst layers, namely a catalyst layer containing the cerium compound and a catalyst layer containing palladium.

REFERENCES:
patent: 4624940 (1986-11-01), Wan
patent: 5212142 (1993-05-01), Dettling
patent: 5286699 (1994-02-01), Ohata et al.
patent: 5376610 (1994-12-01), Takahata et al.
patent: 5741467 (1998-04-01), Williamson et al.
patent: 5753580 (1998-05-01), Hayashi
European Search Report, EP 96 12 0892, Jun. 3, 1997.

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