| US 7,576,032 B2 | ||
| Catalyst composition | ||
| Hirohisa Tanaka, Shiga (Japan); Isao Tan, Shiga (Japan); Mari Uenishi, Shiga (Japan); and Masashi Taniguchi, Shiga (Japan) | ||
| Assigned to Daihatsu Motor Co., Ltd., Osaka (Japan) | ||
| Appl. No. 10/583,153 PCT Filed Dec. 15, 2004, PCT No. PCT/JP2004/019138 § 371(c)(1), (2), (4) Date Jun. 16, 2006, PCT Pub. No. WO2005/058490, PCT Pub. Date Jun. 30, 2005. |
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| Claims priority of application No. 2003-419611 (JP), filed on Dec. 17, 2003. | ||
| Prior Publication US 2007/0249497 A1, Oct. 25, 2007 | ||
| Int. Cl. B01J 23/02 (2006.01); B01J 23/06 (2006.01); B01J 23/00 (2006.01); B01J 23/10 (2006.01); B01J 23/42 (2006.01); B01J 23/44 (2006.01) | ||
| U.S. Cl. 502—340 [502/302; 502/303; 502/304; 502/325; 502/328; 502/339; 502/350] | 4 Claims |
| 1. A catalyst composition comprising a perovskite-type composite oxide represented by the following general formula (1):
A1−xA′xB1−(y+z)B′yNzO3 (1)
wherein A represents at least one element selected from the group consisting of alkaline earth metals;
A′ represents at least one element selected from the group consisting of rare earth elements;
B represents Ti;
B′ represents at least one element selected from the group consisting of transition elements (excluding rare earth elements,
Ti, Rh, and Pt) and Al;
N represents at least one element selected from the group consisting of 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;
wherein A represents at least one element selected from the group consisting of Ca, Sr, and Ba in the general formula (1);
and
wherein y represents 0 in the general formula (1).
|