Title:
EXHAUST EMISSION CONTROL CATALYST
Document Type and Number:
WIPO Patent Application WO/1999/013981
Kind Code:
A1
Abstract:
An exhaust emission control catalyst comprising a first zeolite supporting a catalyst metal and a second zeolite not supporting a catalyst metal. Hydrocarbon (HC) poisoning of the catalyst metal supported by the first zeolite can be restricted by causing HC to be positively adsorbed onto the second zeolite and HC can be adsorbed sufficiently. Because, HC adsorption performance can be improved and HC poisoning of the catalyst metal is restricted, NOx emission control performance and catalyst durability can be improved.
Inventors:
TAKAHASHI HIROAKI (JP)
TAKADA TOSHIHIRO (JP)
KURACHI SAEKO (JP)
TAKADA TOSHIHIRO (JP)
KURACHI SAEKO (JP)
Application Number:
PCT/JP1998/004072
Publication Date:
March 25, 1999
Filing Date:
September 09, 1998
Export Citation:
Assignee:
TOYOTA MOTOR CO LTD (JP)
TAKAHASHI HIROAKI (JP)
TAKADA TOSHIHIRO (JP)
KURACHI SAEKO (JP)
TAKAHASHI HIROAKI (JP)
TAKADA TOSHIHIRO (JP)
KURACHI SAEKO (JP)
International Classes:
B01D53/94; B01J29/80; B01J37/02; F01N3/08; B01J29/068; B01J29/18; B01J29/65; B01J35/04; (IPC1-7): B01J29/064; B01J29/10; B01J29/20; B01J29/42; B01J29/66; B01D53/94; F01N3/08
Foreign References:
| JPH07155613A | 1995-06-20 | |||
| JPH0549933A | 1993-03-02 | |||
| JPH05228370A | 1993-09-07 | |||
| JPH02135126A | 1990-05-24 | |||
| JPH04267951A | 1992-09-24 | |||
| JPH06327980A | 1994-11-29 | |||
| JPH02222727A | 1990-09-05 | |||
| JPH10225635A | 1998-08-25 | |||
| JPH09215926A | 1997-08-19 | |||
| JPH0751542A | 1995-02-28 | |||
| JPH05285392A | 1993-11-02 |
Other References:
See also references of EP 1027930A4
Attorney, Agent or Firm:
Ohkawa, Hiroshi (2-5 Meieki 3-chome Nakamura-ku Nagoya-shi Aichi-ken, JP)
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