Title:
CATALYST FOR PURIFYING EXHAUST GAS
Document Type and Number:
Japanese Patent JP3799466
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve heat resistance by controlling the growth of noble metal particles in a catalyst for purifying exhaust gas in which the noble metal is supported on a carrier containing zirconia by providing the carrier containing at least one kind of oxide of a rare earth element excluding cerium and zirconia and the noble metal supported on the carrier.
SOLUTION: A carrier of a catalyst for purifying exhaust gas is formed from at least one kind of oxide of a rare earth element excluding cerium and zirconia. By mixing the oxide with zirconia, the growth of noble metal particles can be controlled to improve heat resistance even when used at a high temperature. As the rare earth element excluding cerium, yttrium (Y) indicates particularly excellent effects. The atomic ratio of the rare earth element to zirconium in the carrier is preferably 0.1/0.9-0.9/0.1. As the noble metal supported on the carrier is preferably Pt high in activity.
Inventors:
Terao Naohiro
Shinichi Matsunaga
Akihiko Suda
Miho Hatanaka
Katori Toshio
Hideo Sofukawa
Shinichi Matsunaga
Akihiko Suda
Miho Hatanaka
Katori Toshio
Hideo Sofukawa
Application Number:
JP28962299A
Publication Date:
July 19, 2006
Filing Date:
October 12, 1999
Export Citation:
Assignee:
Toyota Central R & D Labs.
International Classes:
B01D53/86; B01J23/63; B01D53/94; B01J23/10; B01J32/00; (IPC1-7): B01J23/63; B01D53/86; B01D53/94
Domestic Patent References:
| JP63116742A | ||||
| JP4265155A | ||||
| JP5212284A | ||||
| JP2000051698A | ||||
| JP62168544A | ||||
| JP7060118A | ||||
| JP9175823A | ||||
| JP58183947A | ||||
| JP59156434A | ||||
| JP8325015A |
Attorney, Agent or Firm:
Hiroshi Okawa