Title:
CATALYST FOR EXHAUST GAS PURIFICATION
Document Type and Number:
WIPO Patent Application WO/2008/010576
Kind Code:
A1
Abstract:
A catalyst having noble metals deposited in optimal amounts. The catalyst has a
coat layer in which an area upstream in an exhaust gas contains platinum deposited in
an amount exceeding 0.75 g per liter of the support base, and the density of rhodium deposited
in the coat layer has been regulated so that it is higher on the exhaust gas downstream
side than on the exhaust gas upstream side. Since rhodium has been deposited
at a high density on the exhaust gas downstream side, where the atmosphere is apt
to become a rich atmosphere, the purification performance after idling is improved.
Inventors:
YAMATO MASANORI (JP)
KUNO OJI (JP)
KUNO OJI (JP)
Application Number:
PCT/JP2007/064358
Publication Date:
January 24, 2008
Filing Date:
July 20, 2007
Export Citation:
Assignee:
TOYOTA MOTOR CO LTD (JP)
YAMATO MASANORI (JP)
KUNO OJI (JP)
YAMATO MASANORI (JP)
KUNO OJI (JP)
International Classes:
B01D53/94; B01J23/63; B01J35/04
Domestic Patent References:
| WO2006028028A1 | 2006-03-16 | |||
| WO2001074476A1 | 2001-10-11 |
Foreign References:
| JP2001252565A | 2001-09-18 | |||
| JP2004016931A | 2004-01-22 | |||
| JPS63168032U | 1988-11-01 | |||
| JPH05293376A | 1993-11-09 | |||
| JP2006231204A | 2006-09-07 | |||
| JP2007038072A | 2007-02-15 | |||
| JPH06198181A | 1994-07-19 | |||
| JP2004181374A | 2004-07-02 | |||
| JP2001252565A | 2001-09-18 |
Other References:
See also references of EP 2047903A4
Attorney, Agent or Firm:
OHKAWA, Hiroshi (Nakamura-kuNagoya-sh, Aichi 02, JP)
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