Title:
OXIDATION CATALYST FOR CLEANING EXHAUST GAS AND PREPARATION THEREOF
Document Type and Number:
Japanese Patent JPH09108570
Kind Code:
A
Abstract:
To effectively prevent the generation of sulfate and to reduce the discharge of particulates.
The quantity of noble metal supported on the surface layer of the secondary particles of a porous material on the incoming gas side located upstream in an exhaust gas flow is made greater than that on the outgoing gas side located downstream. Since HC is oxidized easily as compared with SO2, HC is oxidized preferentially on the incoming gas side, while the oxidation of SO2 is controlled on the outgoing gas side because of poor Pt on the surface layer. Therefore, the oxidation of SO2 is prevented by the catalyst as a whole.
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Inventors:
TAGUCHI MICHIO
Application Number:
JP27127795A
Publication Date:
April 28, 1997
Filing Date:
October 19, 1995
Export Citation:
Assignee:
TOYOTA MOTOR CORP
International Classes:
F01N3/28; B01D53/86; B01D53/94; B01J23/38; (IPC1-7): B01J23/38; B01D53/86; B01D53/94; F01N3/28
Attorney, Agent or Firm:
Hiroshi Okawa