| 摘要 |
PROBLEM TO BE SOLVED: To increase hydrocarbon-purifying performance, particularly the high purifying performance to an unpurified hydrocarbon component under the wide atmosphere condition from the rich to the lean around a stoichiometric point. SOLUTION: In an integrated structure type catalyst having a catalyst component carrying layer, two kinds of a Zr multiple oxide (A) containing as catalyst components at least one kind selected from among Pt, Pd and Rh, and moreover containing at least one kind selected from group 2A elements and group 3B elements (Ce is excluded) and a Zr multiple oxide (B) containing at least one kind selected from among Ce, group 3A elements and group 6B elements are used as a Pt carrying base material.
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