Title:
CATALYST FOR PURIFYING DIESEL EXHAUST GAS
Document Type and Number:
Japanese Patent JP3433885
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To further reduce the discharge of particulates by improving heat resistance.
SOLUTION: This catalyst is composed of the first coating layer 2 carrying Pt 4 and the second layer 3 carrying no Pt 4, and a layer thickness of the first coating layer 2 is kept in 1/10 to 1/5 of total layer thickness. A grain size of the Pt 4 is made larger compared with the case when the Pt 4 is deposited on a conventional mono coating layer by depositing the Pt 4 in high density on the first coating layer 2 thin in thickness. Therefore, a sintering of the Pt due to thermal history is hardly caused and durability is improved.
Inventors:
Akemi Sato
Application Number:
JP3088197A
Publication Date:
August 04, 2003
Filing Date:
February 14, 1997
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
B01D53/86; B01D53/94; B01J20/18; B01J21/16; B01J23/42; B01J33/00; (IPC1-7): B01J23/42; B01D53/86; B01D53/94; B01J20/18; B01J21/16; B01J33/00
Domestic Patent References:
| JP605230A | ||||
| JP557191A | ||||
| JP8508442A |
Attorney, Agent or Firm:
Hiroshi Ohkawa
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