制备方法对Fe-Mn/ZSM-5/CC催化还原NO_x性能的影响

Study of the Effect of Preparation Method on the Catalytic Reduction of NO_x over Fe-Mn/ZSM-5/CC

采用溶液浸渍法、浆液浸涂法和超声波辅助浸涂法制备了3种Fe‐Mn／ZSM‐5／CC（CC即堇青石）整体式催化剂，研究了其催化还原 NOx 的性能。利用 N2吸附脱附、XRD、扫描电镜等技术对催化剂结构和性质进行探究。结果表明，制备方法对Fe‐M n／ZSM‐5／CC整体式催化剂催化还原NOx 性能有明显的影响，与溶液浸渍法和浆液浸涂法相比，超声波辅助浸涂法制备的催化剂具有较大的比表面积、较均匀的涂层以及较多的介孔结构，使其显示出最佳的催化性能，在180～430℃的温度范围内其转化率都在90％以上。

Solution impregnation ,slurry dip coating and ultrasonic assisted dip coating were a‐dopted to prepare three kinds of Fe‐Mn/ZSM‐5/CC （CC ：cordierite） monolithic catalysts .Their performance in catalytic reduction of NO x was studied .N2 adsorption and desorption ,XRD and SEM were used to explore the structure and properties of the catalysts .The results show that the catalyst preparation methods had significant impact on the performance of Fe‐M n/ZSM‐5/CC monolithic catalysts in catalytic reduction of NO x .The catalyst produced by ultrasonic assisted dip coating showed the best catalytic performance when compared with those prepared by solution impregnation or slurry dip coating .The reason was explained by its larger specific surface area , more uniform coatings and mesoporous structure .Its conversion rate was above 90% in the tem‐perature range of 180~430 ℃ .