| 摘要 |
PROBLEM TO BE SOLVED: To efficiently promote combustion of a PM deposited on a particulate filter.SOLUTION: A catalyst layer 22 provided on an exhaust gas passage wall 21 of a particulate filter comprises: a Pd-supported Zr-containing composite oxide in which palladium (Pd) 24 is supported on a Zr-containing composite oxide 23 containing zirconium (Zr) and a rare earth element other than cerium (Ce) as catalyst metals; and a Pt-supported Zr-containing composite oxide in which platinum (Pt) 25 is supported on a Zr-containing composite oxide 23 as a catalyst metal. |
