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 NO_x. 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. [ABSTRACT FROM AUTHOR]