Experimental effects of ash (ZnO) and catalyst (CeO2) on DPF regeneration performance and emission characteristics

The regeneration characteristics of a diesel particulate filter (DPF) are studied on a regeneration test bench, with a focus on the effects of ash and catalyst, including the effects of ZnO and CeO2 on the regeneration performance and emission characteristics of the DPF. The results indicate that the addition of ZnO and CeO2 can easily lead to local high temperatures during the regeneration process of the DPF, with the highest peak temperature appearing in a 1:3 ratio for both ZnO and CeO2, leading to a significant increase in CO2. Compared with ZnO, CeO2 can advance the DPF rapid regeneration period by about 300 s. When the ratio of PU: CeO2 is 1:5, the total particulate matter emitted is reduced to the lowest level, but it will significantly increase the emission of nuclear model particles, especially particles below 23 nm. Under the same mixing ratio, an increase in carbon loading can enhance the oxidation ability of ZnO towards carbon black, but the difference between the number of particles emitted during DPF regeneration and regeneration efficiency will gradually decrease.