利用等体积浸渍法制备了不同组成的CuFeO/γ-Al₂O₃复合氧化物催化剂，通过催化分解N₂O的活性评价结果确定催化剂的最佳Cu-Fe原子质量比为2∶1、最佳负载量为25%。通过XRD、BET、H₂-TPR等表征手段对催化剂的结构进行研究。结果表明，Cu₂Fe₁O/γ-Al₂O₃催化剂表面的CuO结晶度较小且高度分散，具有较大的比表面积；相比其他CuFeO/γ-Al₂O₃复合氧化物催化剂和单组分CuO/γ-Al₂O₃催化剂，Cu₂Fe₁O/γ-Al₂O₃还原能力更强，故表现出更强的N₂O催化分解能力。考察了N₂O质量分数、O₂体积分数、空速等反应条件对Cu₂Fe₁O/γ-Al₂O₃活性的影响。在515℃高温条件下连续反应100 h，N₂O转化率保持在90%左右，表明Cu₂Fe₁O/γ-Al₂O₃催化剂具有良好的热稳定性。

A group of CuFeO/γ-Al₂O₃ composite oxides catalysts with different compositions are prepared by equal volume impregnation method.The best Cu-Fe atomic ratio in catalyst is determined as 2:1 and the optimal loading amount is 25% through activity evaluation in catalytic decomposition of N₂O.The structure of the catalyst is studied by means of XRD,BET and H₂-TPR characterization methods.Study results illustrate that CuO crystal on the surface of Cu₂Fe₁O/γ-Al₂O₃ catalyst is small,highly dispersed,and has a large specific surface area;Compared with other CuFeO/γ-Al₂O₃ composite oxide catalysts and CuO/γ-Al₂O₃ catalysts,Cu₂Fe₁O/γ-Al₂O₃ has stronger reducing ability,so it exhibits stronger ability in catalytic decomposition of N₂O.Effects of several reaction conditions on the activity of Cu₂Fe₁O/γ-Al₂O₃ are studied,including the mass fraction of N₂O,the volume fraction of O₂ and space velocity.The conversion of N₂O over Cu₂Fe₁O/γ-Al₂O₃ keeps at 90% in 100 h of continuous reaction at 515℃,indicating that Cu₂Fe₁O/γ-Al₂O₃ catalyst has a good thermal stability.

黄思齐(1994-),男,硕士研究生,研究方向为工业催化减排,945107635@qq.com