Composite oxide, process for producing the same, and exhaust...

Details Composite oxide, process for producing the same, and exhaust... Composite oxide, process for producing the same, and exhaust...

2007-07-24

2007-07-24

Lorengo, J. A. (Department: 1755)

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

C502S305000, C502S349000, C502S351000, C423S594120, C423S608000, C501S103000

Reexamination Certificate

active

10225186

ABSTRACT:
A composite oxide includes CeO2, ZrO2and a metallic oxide being free from reacting with CeO2and ZrO2at 700° C. or more, preferably at 900° C. or more and further preferably at 1,000° C. or more. The composite oxide has a regulatory oriented phase, such as a pyrochlore phase, etc., in which at least a part of Ce cations and Zr cations are oriented regularly. The composite oxide makes a catalytic support. The CeO2—ZrO2composite oxide and the reaction-free metallic oxide make barriers each other which suppress the granular growth when the composite oxide is subjected to high-temperature heat in a reducing heat treatment to form the regulatory oriented phase. The regulatory oriented phase improves the oxygen storage-and-release capability of the catalytic support. Thus, it is possible to simultaneously attain a large a specific surface area and a high oxygen storage-and-release capability.

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