Comparison of soot combustion dynamics in the catalytic diesel particulate filters and non-catalytic diesel particulate filters

In the curent study, we delve into the impact of catalyst usage on the regeneration process of wall-flow diesel particulate filters (DPFs) by utilizing a two-dimensional mathematical model of soot combustion. The catalytic DPF reaches a higher peak regeneration temperature and achieves this peak earlier than the non-catalytic DPF. The temperature distribution differences between the non-catalytic DPF and the catalytic DPF are most pronounced from 80 to 200 seconds. The soot retention in the non-catalytic DPF decreases slowly, almost linearly, and by 600 seconds, the soot conversion rate is still less than 50%. In contrast, for the catalytic DPF, it takes only 200 seconds to combust 80% of the soot. For both the non-catalytic DPF and the catalytic DPF, there is no occurrence of a combustion front propagation, indicating that both operate under the mechanism of mild regeneration mode.