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US 6,569,803 B2Granted
Catalyst for purifying exhaust gas
AssigneeToyota Jidosha Kabushiki Kaisha
InventorMasahiko Takeuchi
Life of this patent
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Abstract
A catalyst, for purifying an exhaust gas, contains at least one catalyst component from among Pt, Pd, Rh, Au, Ag and Ir, and a complex oxide of the perovskite type comprising at least two different metal elements. In the catalyst, the catalyst component is carried on the complex oxide.
Claims23
A catalyst, for purifying an exhaust gas, comprising:
- at least one catalyst component selected from the group consisting of Pt, Pd, Rh, Au, Ag and Ir, and
- a complex oxide of the perovskite type represented by the structural formula ABO3, where each of A and B is at least one metal and said complex oxide comprises at least two different metal elements,
- wherein said catalyst component is carried on said complex oxide, and at least one metal selected from the group consisting of alkali metals and alkaline earth metals is further carried on said complex oxide.
A catalyst, for purifying an exhaust gas, comprising:
- at least one catalyst component selected from the group consisting of Pt, Pd, Rh, Au, Ag and Ir, and a complex oxide of the perovskite type,
- wherein said perovskite type is represented by the structural formula:
- La1-xKxBO3, wherein B is at least one metal selected from the group consisting of Mn, Co, Fe and Ni, and 0≦x<1,and
- wherein said catalyst component is carried on said complex oxide.
1 more element
A catalyst, for purifying an exhaust gas, comprising:
- at least one catalyst component selected from the group consisting of Pt, Pd, Rh, Au, Ag and Ir, and a complex oxide of perovskite type,
- wherein said perovskite type is represented by the structural formula:
- A1-xKxB1-yTiyO3, wherein A is at least one metal selected from the group consisting of La, Ce, Pr, Nd, Sm, Eu, Gd and Y, B is at least one metal selected from the group consisting of Mn, Co, Fe and Ni, 0.05<x<1 and 0≦y<1, and
- wherein said catalyst component is carried on said complex oxide.
1 more element
A catalyst, for purifying an exhaust gas, comprising:
- at least one catalyst component selected from the group consisting of Pt, Pd, Rh, Au, Ag and Ir, and a complex oxide of perovskite type,
- wherein said perovskite type is represented by the structural formula:
- A1-xKxB1-yTiyO3, wherein A is at least one metal selected from the group consisting of La, Ce, Pr, Nd, Sm, Eu, Gd and Y, B is at least one metal selected from the group consisting of Mn, Co, Fe and Ni, 0<x<1 and 0.05<y<1, and
- wherein said catalyst component is carried on said complex oxide.
1 more element
Dependencies are inferred from the claim text.