Introducing cerium into TiO2@MnOx hollow-sphere structure for highly active photothermocatalysis degradation of ethyl acetate and NO under H2O at low temperature

Abstract

The CeO2-TiO2@MnOx catalyst was prepared by the co-precipitation method and applied to the photothermocatalysis system of ethyl acetate and NO simultaneous degradation under H2O at low temperature, which introduced Ce into TiO2@MnOx hollow sphere structure. The optimum TiO2/MnOx ratio and Ce introducing amount were obtained in the process. Among of them, the NO and ethyl acetate conversion percentage of TiO2@MnOx (nMn:nTi = 40:40) is 74% and 62% at 240 °C, respectively. CeO2-TiO2@MnOx (nMn-Ti:nCe = 1:1) exhibits the best catalytic performance, its efficiency for NO conversion is 83% and the conversion of ethyl acetate reaches 72% at 240 °C. In addition, it is confirmed that the Ce-doped nanocomposites have more uniform dispersion through various characterization and analysis methods. Meanwhile, these catalysts have a large specific surface area as well as a large number of surface-active oxygen and oxygen vacancies. It can further improve the catalytic performance based on the adjusted ratio of active components. Moreover, this work investigated the relationship between multi-metal interactions and catalytic performance in the presence of H2O. Finally, the possible reaction pathways for the simultaneous removal of NO and ethyl acetate were explored in our system.