The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 22, 2020
Filed:
Nov. 15, 2016
Mitsui Mining & Smelting Co., Ltd., Tokyo, JP;
MITSUI MINING & SMELTING CO., LTD., Tokyo, JP;
Abstract
A catalyst powder according to the present invention is a catalyst powder that includes: a core portion that contains ceria and zirconia; and a surface layer portion that is located on the core portion and contains ceria and zirconia. The ratio (M/M) is 0.30 or more and 0.95 or less, the ratio (M/M) being the ratio of a mole fraction M(mol %) of cerium in the surface layer portion measured using X-ray photoelectron spectroscopy to a mole fraction M(mol %) of cerium in the entire powder. It is preferable that the ratio (M/M) between Mand Mis 1.1 or more and 5.0 or less, wherein M(=M/M) represents the ratio between a mole fraction M(mol %) of zirconium in the entire powder and a mole fraction M(mol %) of cerium in the entirety of the powder, and M(=M/M) represents the ratio between a mole fraction M(mol %) of zirconium measured using X-ray photoelectron spectroscopy and a mole fraction M(mol %) of cerium measured using X-ray photoelectron spectroscopy.