| 简介 |
In at least part of a catalyst layer 7 of a particulate filter, a second catalyst part 9 is exposed on the surface of the catalyst layer to overlie a first catalyst part 8, the first catalyst part 8 contains Pt-carried activated alumina particles, the second catalyst part 9 contains ZrNd-based mixed oxide particles containing a rare earth metal M and at least one of the first catalyst part 8 and the second catalyst part 9 further contains CeZr-based mixed oxide particles containing a rare earth metal R. |
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