LOW-TEMPERATURE SELECTIVE CATALYTIC REDUCTION OF NOX WITH NH3 OVER MANGANESE OXIDES SUPPORTED ON TiO2-GRAPHENE OXIDE

摘要

A serial of Mnox/TiO2-GO catalysts prepared by sol gel and impregnation method with diverse ratio hf M110,‘ (0-10wt) were studied for low temperature selective catalytic reduction of NOX with NH3. Samples characterized by TEM, XRD, H2,-TPR, BET and XPS. The activity test conse- quence showed that different GO content influences the NH3—SCR catalytic ability of MnOx/TiO2-GO. The optimum ratio of MnOx for best Catalytic activ- ity is 3wt. Meanwhile, the 3wtMnOx/TiOg-GO catalyst reached 90 of NO removal efficiency at 220°C and can hold 100 from 240°C to 340°C. The BET results show that 3MnOx/TiOg-GO has the biggest surface area (215 m3/g) and pore vol- ume (0.323 cm3/g). The XPS indicated that MnOx uniformly disperses on the surface of TiOojGO and the active component presents multiple valence, the 3MnOx/TiO;>,-GO has the highest surface concen- tration of M113“ and Mn‘“‘(82.57), and the most surface-adsorbed oxygen (58.85). The uniform distribution of active sites and the high specific surface areas of 3MnOx/Ti.O2-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 Mn“, own to the increased active sites and MnOx with high valence and the increased chernisorbed oxygen on the surface.