▎ 摘　　要

A serial of MnOx/TiO2-GO catalysts prepared by sol gel and impregnation method with diverse ratio of MnOx (0-10wt%) were studied for low temperature selective catalytic reduction of NOx with NH3. Samples characterized by TEM, XRD, H-2-TPR, BET and XPS. The activity test consequence showed that different GO content influences the NH3-SCR catalytic ability of MnOx/TiO2-GO. The optimum ratio of MnOx for best catalytic activity is 3wt%. Meanwhile, the 3wt%MnOx/TiO2-GO catalyst reached 90% of NO removal efficiency at 220 degrees C and can hold 100% from 240 degrees C to 340 degrees C. The BET results show that 3MnOx/TiO2-GO has the biggest surface area (215 m(2)/g) and pore volume (0.323 cm(3)/g). The XPS indicated that MnOx uniformly disperses on the surface of TiO2/GO and the active component presents multiple valence, the 3MnOx/TiO2-GO has the highest surface concentration of Mn3+ and Mn4+(82.57%), and the most surface-adsorbed oxygen (58.85%). The uniform distribution of active sites and the high specific surface areas of 3MnO(x)/TiO2-GO provided more reactive activity sites. In this work, 3MnOx/TiO2-GO exhibits the best reactive activity and redox property, the maximum surface area, and the maximum content of Mn4+, own to the increased active sites and MnOx with high valence and the increased chemisorbed oxygen on the surface.