Title:
CATALYST FOR EXHAUST GAS CONTROL
Document Type and Number:
Japanese Patent JP2002320856
Kind Code:
A
Abstract:
To improve the removal rate of HC by activating catalyst metals in early stages.
In the catalyst for exhaust gas control consisting of an adsorbing layer 2 containing an adsorbent for HC and a catalyst layer 3 formed on the surface of the adsorbing layer 2, the amount of the catalyst metals carried is gradually increased from the lower surface side of the catalyst layer 3 in contact with the adsorbing layer 2 to the upper surface side of the catalyst layer 3. Thus, the contact probability between the catalyst metals and the exhaust gas is increased to activate the catalyst metals in early stages.
Inventors:
FUJIWARA TAKAHIKO
SUZUKI HIROMASA
UENO HIDEAKI
SUZUKI HIROMASA
UENO HIDEAKI
Application Number:
JP2001131930A
Publication Date:
November 05, 2002
Filing Date:
April 27, 2001
Export Citation:
Assignee:
TOYOTA MOTOR CORP
International Classes:
F01N3/08; B01D53/86; B01D53/94; B01J20/18; B01J29/44; F01N3/10; F01N3/24; F01N3/28; (IPC1-7): B01J29/44; B01D53/86; B01D53/94; B01J20/18; F01N3/08; F01N3/10; F01N3/24; F01N3/28
Domestic Patent References:
| JPH05317701A | 1993-12-03 | |||
| JPH05168862A | 1993-07-02 | |||
| JPH0256247A | 1990-02-26 | |||
| JPH11104462A | 1999-04-20 | |||
| JPH0938498A | 1997-02-10 |
Attorney, Agent or Firm:
Hiroshi Okawa
Previous Patent: JP2002320855
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