Layer MnO2 with oxygen vacancy for improved toluene oxidation activity

Volatile organic compounds (VOCs) is known as global air pollutant, which urgent needs to be removed. It is necessary to obtain an efficient catalyst with high activity to achieve completely oxidize VOCs into CO2 and H2O at low temperature. The catalytic reaction on the catalyst surface usually requires active sites, which are closely related to structure defects. In this paper, the MnO2 sample treated with TMAOH and TPAOH shows higher activity, and the MnO2-P catalyst has the best catalytic performance (T50 = 207 °C, T90 = 223 °C). The formation of irregular pores on the surface of MnO2−M and MnO2-P results in the increase of the surface area, pore volume and amount of oxygen vacancy. And the MnO2-P has the highest content of oxygen vacancy. Therefore the improved adsorption of toluene (toluene-TPD) together with the enhanced reducibility and mobility of lattice oxygen (H2-TPR and XPS) causes the outstanding catalytic performance of MnO2-P sample.