Composite oxide for use as exhaust gas purification catalyst...

Details Composite oxide for use as exhaust gas purification catalyst... Composite oxide for use as exhaust gas purification catalyst...

2007-10-10

2011-12-06

Silverman, Stanley (Department: 1736)

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

C502S302000, C502S325000, C502S353000

Reexamination Certificate

active

08071501

ABSTRACT:
A composite oxide for exhaust gas purification catalysts, which comprises Ce, Bi, R and oxygen and satisfies 0<x≦0.4 and 0<y<1.0 when the molar ratio of Ce, Bi and R of the oxide is represented as (1−x−y), x and Y respectively. The composite oxide has an X-ray diffraction peak corresponding to that of a fluorite structure. In the composite oxide, R contains one or two of Pr and Tb. The exhaust gas purification catalyst is favorable for a PM combustion catalyst.

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Z.C. Kang et al., “Lattice Oxygen Transfer in Fluorite-Type Oxides Containing Ce, Pr, and/or Tb” (2000)Journal of Solid State Chemistry, vol. 155 pp. 129-137.

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