Fe-modified Ce-MnOx/ACF(N) catalysts for selective catalytic reduction of NOx by NH3 at low-middle temperature

摘要

A series of MnOx/ACF(N), Ce-MnOx/ACF(N), and Fe-Ce-MnOx/ACF(N) catalysts on selective catalytic reduction (SCR) of NOx with NH3 at low-middle temperature had been successfully prepared through ultrasonic impregnation method, and the catalysts were characterized by SEM, XRD, BET, H-2-TPR, NH3-TPD, XPS, and FT-IR spectroscopy, respectively. The results demonstrated that the 15 wt% Fe-(1)-Ce-(3)-MnOx(7)/ACF(N) catalyst achieved 90% NOx conversion (100 similar to 300 degrees C), good water resistance, and stability (175 degrees C). The excellent catalytic performance of the Fe-(1)-Ce-(3)-MnOx(7)/ACF(N) catalyst was mainly attributed to the interaction among Mn, Ce, and Fe. The doping of Fe promoted the dispersion of Ce and Mn and the formation of more Mn4+ and chemisorbed oxygen on the surface of a catalyst. This work laid a foundation for the successful application of active carbon fiber in the field of industrial denitrification, especially in the aspect of denitrification moving bed.