Facile preparation of amorphous CenMnOx catalysts and their good catalytic performance for soot combustion

Diesel engines are widely used because of their low fuel consumption, high fuel efficiency, high reliability, and safety. However, the soot particles contained in diesel engine exhaust have become one of the main sources of urban haze, and their elimination has great significance for environmental protection and economics. In the present study, a series of CenMnOx catalysts with different Ce contents and calcination temperatures were successfully synthetized via a simple hydrothermal process, and the physicochemical characteristics of the as prepared catalysts were investigated. That CenMnOx composite oxides were amorphous, contradicting previous reports that manganese and cerium usually form MnxCe1-xO delta with crystalline structures. Due to Ce doping, the amorphous Ce1MnOx catalysts have higher specific surface area, greater porosity, and better ability to activate oxygen species than pure MnOx catalysts. The amorphous catalysts also exhibit good stability, sulfur and water resistance for catalytic combustion of soot particles. Among the prepared catalysts, Ce1MnOx calcinated at 450 degrees C has the best catalytic activity, the values of T-10, T-50 and T-90 were 258 degrees C, 327 degrees C and 370 degrees C, respectively. Based on their simple preparation, low cost, and good catalytic performance, the amorphous CenMnOx catalysts show promise for application in soot combustion.

Automated summary

In this study, a series of CenMnOx catalysts with different Ce contents and calcination temperatures were successfully synthesized via a simple hydrothermal process. It was found that the Ce-doped Ce1MnOx amorphous catalysts exhibited better ability to activate oxygen species and stability for catalytic combustion of soot particles. These catalysts show promise for application in soot combustion due to their simple preparation, low cost, and good catalytic performance.