| abstract |
Disclosed is a DPF particulate combustion rate which can be increased even when a small amount of catalyst metal is used or no catalyst metal is used. A wall surface constituting an exhaust gas passage of a filter body that collects particulates contains Ce, Zr, and a rare earth element R other than Ce in order to promote combustion of the collected particulates, and Ce. A catalyst layer containing a double oxide having a / (Ce + Zr) molar ratio of 10% to 90% is formed. [Selection] Figure 6 |