MnO_x-Decorated Fe-Zr-Based Nano-Catalysts for Low-Temperature NH_3-SCR: Improvement of Catalytic Activity

摘要

MnO_x-modified Fe-Zr-based nano-catalysts (denoted as Mn(co)/Fe-Zr and Mn(im)/Fe-Zr) were synthesized with the co-precipitation impregnation method and impregnation method, respectively, and then were used for low-temperature selective catalytic reduction of NO with NH_3 (SCR). Among these catalysts, the Mn(co)/Fe-Zr catalyst exhibits the highest NH_3-SCR activity (94%) at 225°C when WHSV = 300,000 mL g~(-1) h~(-1). Meanwhile, the properties of catalysts had been characterized by XRD, BET, XPS, and H_2-TPR. As determined by BET, the addition of MnO_x increased the surface area and pore volume of the catalyst. The XRD results suggest that the Mn(co)/Fe-Zr possessed highly dispersed MnO_x on the surface of the catalyst. The results of XPS revealed that the Mn(co)/Fe-Zr had highest concentrations of Mn~(4+) and Fe~(3+).