The control of volatile organic compounds (VOCs) has attracted attention in both academic and industrial communities. Catalytic oxidation is considered to be one of the most promising methods for the removal of VOCs due to the high efficiency, low reaction temperature and low cost. The catalytic removal of toluene, which is one of the typical VOCs, is very important for the control of VOCs. Catalyst plays a key role for the catalytic oxidation of toluene. Considering the good redox property, high hydrothermal stability and the low cost of MnOx, many researchers have conducted intensive study on the catalytic oxidation of toluene over MnOx-based catalysts. MnOx-based catalysts can be classified into heterogeneous MnOx, transition metal-doped MnOx and supported MnOx. For the heterogeneous MnOx, such as α@β-MnO2, the advantages of different MnOx phase can be made full use of. In addition, more oxygen vacancies are generated in the phase interface, promoting the oxygen flow and thereby improving the reaction efficiency. Introduction of transition metals to MnOx would contribute to the electron transfer between metals and enhance the oxygen mobility of the catalyst, thus enhancing the redox property. In the case of supported MnOx the strong metal-support interaction is beneficial for the improvement of the catalytic performance. Morphology control and the acid treatment of MnOx-based catalysts can also lead to improved activity by regulating the specific surface area, the active oxygen species and the redox ability of the catalysts. The oxidation of toluene on the MnOx-based catalyst follows Mars-van Krevelen (MVK) or Langmuir-Hinshelwood(L-H) mechanism. For both mechanisms the intermediate with an aromatic ring is formed. In this review, the types of MnOx catalysts, influencing factors and mechanism of the catalytic oxidation of toluene over manganese-based oxide have been summarized and discussed. And the perspective on MnOx-based catalysts for the catalytic oxidation of toluene has been proposed. © 2020, Materials Review Magazine. All right reserved.
