Title:
排ガス浄化用触媒組成物
Document Type and Number:
Japanese Patent JP4916173
Kind Code:
B2
Abstract:
To provide a catalyst composition which prevents the activity from deteriorating due to grain growth of Rh and/or Pt and exhibits satisfactory catalytic performance over a long time, the catalyst composition is prepared so that it comprises a perovskite-type composite oxide represented by the following general formula (1):
A 1-x A' x B 1-(y+z) B' y N z O 3 (1)
wherein A represents at least one element selected from alkaline earth metals; A' represents at least one element selected from rare earth elements; B represents at least one element selected from Ti, Zr, and Hf; B' represents at least one element selected from transition elements (excluding rare earth elements, Ti, Zr, Hf, Rh, and Pt) and Al; N represents at least one element selected from Rh and Pt; x represents an atomic ratio satisfying the following condition: 0 ¤ x ¤ 0.4; y represents an atomic ratio satisfying the following condition: 0 ¤ y < 0.5; z represents an atomic ratio satisfying the following condition: 0 < z ¤ 0.5; and X represents 0 when N represents Pt alone.
Inventors:
Hirohisa Tanaka
Tanko
Mari Nishinishi
Taniguchi Shoji
Tanko
Mari Nishinishi
Taniguchi Shoji
Application Number:
JP2005516386A
Publication Date:
April 11, 2012
Filing Date:
December 15, 2004
Export Citation:
Assignee:
Daihatsu Motor Co., Ltd.
International Classes:
B01J23/58; B01D53/94; B01J23/00; B01J23/89; B01J35/10; C01G55/00; F01N3/10; B01J23/63
Domestic Patent References:
| JPH11342337A | 1999-12-14 | |||
| JP2002301337A | 2002-10-15 | |||
| JP2002204955A | 2002-07-23 | |||
| JPH11151440A | 1999-06-08 | |||
| JPH08224446A | 1996-09-03 | |||
| JPH06100319A | 1994-04-12 | |||
| JPH05261289A | 1993-10-12 | |||
| JP2004043217A | 2004-02-12 |
Foreign References:
| WO2003008095A2 | 2003-01-30 | |||
| US5380692A | 1995-01-10 |
Attorney, Agent or Firm:
Hiroyuki Okamoto