| 简介 |
PROBLEM TO BE SOLVED : To maintain activity enhancement effect of the noble metal particles without increasing manufacturing costs or environmental impacts.
SOLUTION : An exhaust gas purifying catalyst comprises : noble metal particles 1; a first compound 2 which contacts the noble metal particles 1 and suppresses movement of the noble metal particles 1; and a second compound 3 which incorporates the noble metal particles 1 and the first compound 2, suppresses the movement of the noble metal particles 1, and suppresses the coagulation of the first compound 2 following mutual contact of the first compound 2, wherein the first compound 2 supports the noble metal particles 1, and a single body or aggregate of the first compound 2 which supports the noble metal particles 1 is included in a section partitioned by the second compound 3. The first compound 2 is a composite containing a rare earth element and zirconium. The content of zirconium is larger than that of the rare earth element, in the first compound 2.
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