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DPF has become widely known as an indispensable after-treatment component for the purification of the particulate matter in the diesel exhaust gas. But, in order to correspond to further regulation strengthening such as carbon dioxide emission regulation and number-based particulate matter emission regulation, it must be necessary also for DPF to keep improving its performance. In this study, it was examined how to improve both the filtration efficiency and the oxidation efficiency of PM regarding the catalyzed DPF. SiC-made 10mil/300cpsi-OctoSquare asymmetric cell structure was chosen for the DPF substrate and PM oxidation catalyst was coated on the surface of the filter wall as a layer with the device of the coating method. As a result, it was found that the layer coated DPF has advantage on the filtration efficiency without soot accumulation and efficiency was similar to an uncoated one with 0.1 g/l soot loading.

One technology for removing PM discharged from diesel-powered vehicles is the DPF system. The DPF system brings about increases in pressure loss because PM accumulates in the filter. DPF with a high cell density shows low pressure loss when PM accumulates because of the large filtration area, and in addition, it makes it possible to thin the cell wall because it has a high thermal diffusion ability. For the catalyzation of SiC, the pore size and porosity of the base material were changed. Even when a catalyst is borne, pressure loss which DPF changed pore structure hardly changes. This verification was done based on the theory and by means of experimentation.