Mn and Ce were loaded on the coconut-hell-based activated carbon treated by nitric acid (ACN) using impregnation method for low temperature selective catalytic reduction (SCR) of NO with NH3.The catalytic activity was evaluated at a fixed-bed,and,the loading order and loading amount of Ce and Mn were studied.The Catalysts were characterized by BET,SEM,XRD and XPS.The results showed that the Ce adding to Mn/ACN improves significantly the denitration activity of catalyst;when temperature is higher than 90 ℃,when the removal rate of NO achieves 90% and maintains 100% at 120~250 ℃.The loading sequence and amount of active component are important factors for influencing catalyst activity.When 5% Ce and 5% Mn were simultaneously loaded on ACN,the catalyst exhibits the best denitration performance.Mn loading on activated carbon can reduce the specific surface area and pore volume of active carbon,and the specific surface area and micro pore volume of Mn-Ce/ACN with 5% Mn and 5% Ce decrease to 695.02/g and 0.130 cm3/g;with the increase of loading,specific surface area and pore volume further decrease;Mn loading with 10% Ce increases to 10%,the specific surface area and micro-pore volume have only 539.8 m2/g and 0.106 cm3/g.Mn3+and Mn4+coexist in Mn/ACN and Mn-Ce/ACN.Ce4+and Ce3+coexist in Mn-Ce/ACN and improve the slight increase of Mn4+content,leading to the best denitration activities.
