Title:
CATALYST FOR PURIFYING INTERNAL COMBUSTION ENGINE EXHAUST GAS
Document Type and Number:
Japanese Patent JP3290579
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a catalyst for purifying internal combustion engine exhaust gas which has especially quick response to NOx purification by making the catalyst have a double layer structure comprising a catalyst layer containing rhodium, palladium, a cerium compound, and refractory inorganic oxides as catalytic components together with a cerium compound and a catalyst layer containing palladium.
SOLUTION: At least two layers comprising a catalyst layer containing rhodium, palladium, a cerium compound, and refractory inorganic oxides as catalytic components and containing the cerium compound on the three dimensional refractory structure body and a catalyst layer containing palladium are formed to give this double-layered catalyst. As the cerium compound, oxides are preferable and the content of the compound is 1-100g, preferably 1-80g, per 1l of the catalyst. The content of palladium is 0.1-20g, preferably 0.1-15g, per 1l of the catalyst. Moreover, it is preferably that rhodium be contained in the catalyst layer containing the cerium compound and that rhodium be not practically contained in the catalyst layer containing rhodium.
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Inventors:
Hideichi Shiraishi
Shigeru Taniguchi
Takeshi Matsumoto
Shigeru Taniguchi
Takeshi Matsumoto
Application Number:
JP34112695A
Publication Date:
June 10, 2002
Filing Date:
December 27, 1995
Export Citation:
Assignee:
ICT Inc.
International Catalyst Technology Incorporated
International Catalyst Technology Incorporated
International Classes:
B01D53/86; B01D53/94; B01J23/63; (IPC1-7): B01J23/63; B01D53/86; B01D53/94
Domestic Patent References:
| JP356138A | ||||
| JP63287555A | ||||
| JP3232531A | ||||
| JP663403A | ||||
| JP6246159A |
Attorney, Agent or Firm:
Mikio Hatta (1 outside)