Catalytic performance of MnO_x/TiO₂ prepared with different precursors in the oxidation of NO with O₃

MnAc/TiO₂, MnCl/TiO₂ and MnN/TiO₂ were prepared by impregnation method using manganese acetate (MnAc), manganese chloride (MnCl₂) and manganese nitrate (Mn (NO₃)₂) as precursors, respectively. These catalysts were characterized by SEM, N₂ physisorption, H₂-TPR, O₂-TPD, XRD and XPS; their catalytic performance in the oxidation of NO with ozone (O₃) was investigated in a fixed bed reactor. The results illustrate that the MnAc/TiO₂ catalyst with manganese acetate as the precursor exhibits the highest activity among three catalysts, which is ascribed to its highly dispersible particles, large surface area and high content of surface Mn³⁺.