Simulation study the PM oxidative regeneration procedures of diesel particulate filter based on a three-stage catalyst coating strategy

In this study, three manganese-based oxide catalysts with high purity spinel configurations were investigated, and their catalytic properties were analyzed. In addition, in order to verify the changes of DPF coated with catalyst in the catalytic combustion process, a three-stage DPF catalytic combustion simulation model was established by COMSOL. Three catalysts (LiMn2O4, ZnMn2O4, and CrMn2O4) were prepared by sol-gel method, and their catalytic effects were determined by comprehensive characterization and testing. Then, the DPF catalytic combustion simulation model was used to determine the change rule of temperature, pressure and carbon particle regeneration efficiency inside the model, the effect of non-uniform coating of catalyst on the regeneration process of carbon particles inside DPF was investigated. Finally, gray correlation analysis was used to study the effects of different parameters in the DPF catalytic combustion model on the change rules of the internal temperature, temperature gradient and regeneration efficiency during the regeneration process. Under three-stage catalyst coating strategy the left-end, middle-end and right-end particle removal rates of DPF reached 96.87 %, 93.5 % and 80.6 %, respectively.