Title:
DEVICE FOR PURIFYING EXHAUST GAS FROM ENGINE
Document Type and Number:
Japanese Patent JP3496250
Kind Code:
B2
Abstract:
PURPOSE: To suppress the poisoning of Pd due to S and to improve the low- temp. HC acitvity of a catalyst with Pd as the catalystic component.
CONSTITUTION: A catalyst 1 with Pd depositing on a base material component is placed in an exhaust gas passage 2 to constitute the device for purifying the exhaust gas from an engine. An air pipe 3 to supply air in the specified mode is furnished on the upstream side of the catalyst 1, and an SO2 sensor 5 and an exhaust gas temp. sensor 6 are installed in the passage 2 on the upstream side of the catalyst 1. The detection signals of the sensors 5 and 6 are inputted to an engine control unit 4 to control the air pump based on the information. The catalyst 1 consists of a honeycomb carrier 10, a base coat layer 20 obtained by depositing Pd on Al2O3 as the first catalyst bed and an overcoat layer 30 formed by depositing Pd on CeO2 as the second catalyst bed.
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Inventors:
Hiroshi Murakami
住田 弘▲祐▼
Yasuhito Watanabe
Masayuki Koishi
住田 弘▲祐▼
Yasuhito Watanabe
Masayuki Koishi
Application Number:
JP26174193A
Publication Date:
February 09, 2004
Filing Date:
September 24, 1993
Export Citation:
Assignee:
Mazda Corporation Inc
International Classes:
B01D53/94; B01J23/56; B01J23/63; B01J33/00; B01J35/04; B01J37/02; B01D53/86; (IPC1-7): B01J23/63; B01D53/86; B01D53/94; B01J23/56; B01J33/00
Domestic Patent References:
| JP5362777A | ||||
| JP1227815A | ||||
| JP5285387A | ||||
| JP7766A | ||||
| JP557191A | ||||
| JP63240949A |
Attorney, Agent or Firm:
Junichi Shindo
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