Preparation of Ag-CeO2-LSCF composite catalyst and its catalytic performance for soot

[Display omitted] •The LSCF perovskite catalyst was prepared by sol–gel method and the Ag-CeO2-LSCF composite catalyst was prepared by impregnation method successfully.•The soot catalytic activity of 8 wt% Ag-CeO2-LSCF composite catalyst is the best, and the T10, T50 and T90 of soot oxidation are 334.6 °C, 380.8 °C and 427.2 °C respectively.•SEM and TEM characterization shows great microstructure of Ag-CeO2-LSCF catalyst, BET test shows that Ag-CeO2-LSCF has larger specific surface area and pore volume than LSCF. In this paper, La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) perovskite catalyst was prepared and compounded with Ag and CeO2 by impregnation method to synthesize Ag-CeO2-LSCF(A-C-L) composite catalyst. The change of catalytic soot performance of LSCF catalyst before and after composite was studied. The results show that the microstructure of A-C-L composite catalyst is good, and the characteristic temperature values of soot are 344.0 °C, 394.8 °C and 445.1 °C, respectively, which are 56.9 °C, 56.5 °C and 51.5 °C lower than those of LSCF. When the content of Ag is 8 wt%, the catalytic performance of A-C-L composite catalyst is the best.