In order to decrease the regeneration temperature of diesel soot deposited in the diesel particulate filter (DPF), the catalyzed DPF is generally used. Since the catalyst is made of expensive noble metals such as platinum, it is better to reduce the amount of catalyst. For that purpose, we need to know the influence of the catalyst on the soot deposition process. In this study, the flow and the soot deposition of the catalyzed DPF (CDPF) have been simulated. The substrate structure of the filter was obtained by an X-ray CT technique. Here, two types of the catalyst coating were considered, which were in-wall and on-wall CDPFs. For both cases, we set the same amount of catalyst. The effects of the catalyst on the pressure drop were evaluated by comparing the simulation without the catalyst. The permeability of the catalyst layer was estimated based on the experimental pressure drop. In particular, the contact ratio of the deposited soot and the catalyst layer was discussed to obtain the information on the regeneration efficiency. It was found that, due to the catalyst, the soot deposition process was affected. Resultantly, the pressure drop of the on-wall CDPF was smaller than that of the in-wall CDPF. In the case of the on-wall CDPF, more deposited soot can be contacted with the catalyst layer, suggesting the higher efficiency for the filter regeneration.

为了降低沉积在柴油机微粒过滤器（DPF）中的柴油机烟灰的再生温度，通常使用催化的DPF。由于催化剂由昂贵的贵金属例如铂制成，因此最好减少催化剂的用量。为此，我们需要了解催化剂对烟灰沉积过程的影响。在这项研究中，已模拟了催化的DPF（CDPF）的流动和烟灰沉积。过滤器的基板结构通过X射线CT技术获得。这里，考虑了两种类型的催化剂涂层，即壁内和壁上的CDPF。对于这两种情况，我们都设置了相同量的催化剂。通过比较没有催化剂的模拟，评估了催化剂对压降的影响。基于实验压降估算催化剂层的渗透性。特别地，讨论了沉积的烟灰与催化剂层的接触比以获得关于再生效率的信息。发现由于催化剂的影响，烟灰沉积过程受到影响。结果，壁上CDPF的压降小于壁上CDPF的压降。在壁上CDPF的情况下，更多的沉积烟灰可以与催化剂层接触，这表明过滤器再生的效率更高。壁上CDPF的压降小于壁上CDPF的压降。在壁上CDPF的情况下，更多的沉积烟灰可以与催化剂层接触，这表明过滤器再生的效率更高。壁上CDPF的压降小于壁上CDPF的压降。在壁上CDPF的情况下，更多的沉积烟灰可以与催化剂层接触，这表明过滤器再生的效率更高。