The MgO/ZrO2 catalysts were prepared by impregnation method.The effect of catalysts calcination temperature on the catalytic oxidation of NO was investigated by the characterize of XRD,SEM and N2 adsorption/desorption and catalyst activity test.The effects of O2 content and catalyst particle size on the conversion of NO were further investigated.The catalysts before and after the reaction under the optimal experimental conditions were analyzed in combination with FTIR characterization.The results indicated that the MgO/ZrO2 catalyst only shows the characteristic peak of ZrO2 at different calcination temperatures;When the calcination temperature was≤300℃,MgO/ZrO2 catalyst was amorphous.Nevertheless,with the increase of calcination temperature,zirconia in the catalyst gradually transforms from amorphous to tetragonal zirconia.The results of catalyst activity test showed that the catalyst calcined at 800℃was more favorable for the catalytic oxidation of NO.The catalytic efficiency of MgO/ZrO2 for NO oxidation was not related to the specific surface area,but related to the slit formed by catalyst accumulation.When the O2 content was 5%,the catalyst particle size was 20 mesh,the conversion rate of NO increased with the increase of reaction temperature;The best NO conversion of 96%was achieved when the reaction temperature was 300℃.
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