Low-temperature SCR of NO with NH3 over AC/C supported manganese-based monolithic catalysts

Metal oxide/active carbon/ceramic (MOx/AC/C) monolithic catalysts were prepared by impregnation method for selective catalytic reduction (SCR) of NOx with NH3 at low-temperature, and they also had been characterized by elemental analysis, N2-BET, XRD, SEM and NO-TPD. The adsorption capability of the monolithic catalyst was greatly enhanced due to the attached active carbon. An ultrasonic treatment was used to improve the impregnation process, and which can increase their catalytic activities. More than 90% NOx conversion could be achieved over the Mn-based monolithic catalysts at low-temperature, and which could be improved further by doping Ce, from 30% to 78% at 100 °C. Mn–Fe–Ce and Mn–V–Ce monolithic catalysts had better tolerance to SO2 than Mn or Mn–Ce monolithic catalysts.