Experimental study on Ag-modified CeO2 as the catalyst for soot oxidation

Ag/CeO2 catalyst is synthesized by hydrothermal method, which has been studied under the effects of different catalyst content, ash and Ag load through activity and characterization tests. Ag loading increases the catalytic activity of CeO2, and the peak combustion temperature of soot decreases by 74 °C. The catalytic effect of Ag/CeO2 is affected by catalyst content, Ag load and ash content. The optimum mass ratio of soot/catalyst is 1/10, and 10 mass% is the saturation value of Ag loading at CeO2. Ash inhibits the promoting effect of Ag/CeO2 in the oxidation process of soot. This study provides a theoretical basis for the industrial application of Ag/CeO2 catalyst in gasoline engine and also provides a research idea for the low-temperature oxidation of soot.