Improvement on the Catalytic Performance of MoO3 Nanobelts for NH3-SCR Reaction by SnO2-Modification: Enhancement of Acidity and Redox Property

The development of environmental benign catalysts is the focus on the selective catalytic reduction (SCR) of NOx. In this study, a series of SnO2-modified MoO3 nanobelts were fabricated by simple impregnation method and applied in the SCR reaction of NO with NH3. On these samples, the SnO2 component disperses evenly on the surface of MoO3 nanobelts, and some synergistic effect exists between the SnO2 component and the MoO3 support. When the content of the loaded SnO2 was 10 wt%, the obtained 10SnO2/MoO3 catalyst exhibits superior catalytic performance in the SCR reaction. Notably, the SnO2/MoO3 catalysts possess great resistance for SO2 and H2O in the reaction as well. The modification of SnO2 could significantly promote the redox property, increase the surface acid sites and the surface chemisorbed oxygen species of the catalysts, which were key factor for the good NH3-SCR catalytic performance of the SnO2/MoO3 catalysts. The SnO2-modifation could improve the acid sites and redox property of the MoO3, thus enhancing its catalytic performance in the NH3-SCR reaction of NO.