Catalyst composition

Details Catalyst composition Catalyst composition

2004-12-15

2009-08-18

Bos, Steven (Department: 1793)

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

C502S302000, C502S303000, C502S304000, C502S325000, C502S328000, C502S339000, C502S350000

Reexamination Certificate

active

07576032

ABSTRACT:
A catalyst composition which prevents deterioration due to grain growth of Rh and/or Pt, includes a perovskite-type composite oxide represented by the following general formula (1):in-line-formulae description="In-line Formulae" end="lead"?A1−xA′xB1−(y+z)B′yNzO3  (1)in-line-formulae description="In-line Formulae" end="tail"?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.

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Y. Nishihata et al., “Self-regeneration of a Pd-perovskite catalyst for automotive emission control”, Nature, Jul. 11, 2002, vol. 418(6894), Nature Publishing Group, Japan.

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