Patent · US Active

Ceria-zirconia base composite oxide, method for producing the same, and catalyst for purification of exhaust gas using the ceria-zirconia base composite oxide

US9376327B2 · kind B2 · utility

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10Claims
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Key dates

Filing dateApr 12, 2011
Grant dateJun 28, 2016
Priority date
Expiry dateMay 29, 2033

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC04B2235/95
  • WIPO fieldMaterials, metallurgy
  • WIPO sectorChemistry

Abstract

A ceria-zirconia base composite oxide contains a composite oxide of ceria and zirconia. In the ceria-zirconia base composite oxide, a content ratio between cerium and zirconium in the composite oxide is in a range from 43:57 to 48:52 in terms of molar ratio ([cerium]:[zirconium]). An intensity ratio of a diffraction line at 2θ=14.5° to a diffraction line at 2θ=29° {I(14/29) value} and an intensity ratio of a diffraction line at 2θ=28.5° to the diffraction line at 2θ=29° {I(28/29) value}, which are calculated from an X-ray diffraction pattern obtained by an X-ray diffraction measurement using CuKa after heating under a temperature condition of 1100° C. in air for 5 hours, respectively satisfy the following conditions: I(14/29) value≧0.015, and I(28/29) value≦0.08.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.