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The selective catalytic oxidation (SCO)of NO was studied on a catalyst consisting of iron-manganese oxide supported on mesoporous silica (MPS) with different Mn/Fe ratios.Effects of the amount of manganese and iron,oxygen,and calcination temperature on NO conversion were also investigated.It was found that the Mn-Fe/MPS catalyst with a Mn/Fe molar ratio of l showed the highest activity at the calcination temperature of 400℃.The results showed that over this catalyst,NO conversion reached 70％under the condition of 280℃ and a space velocity of 5000 h-1.SO2 and H2O had no adverse impact on the reaction activity when the SCO reaction temperature was above 240℃.In addition,the SCO activity was suppressed gradually in the presence of SO2 and H2O below 240℃.and such an effect was reversible after heating treatment.