Abstract: The effects of adding La2O3 to Ni/γ-Al2O3-cordierite structured catalysts on their performance of the hydrogenation reaction of m-dinitrobenzene to m-phenylenediamine were investigated. The Ni catalysts modified by La2O3 were prepared by a coating method and an impregnation method. The catalysts were characterized by BET，XRD，TPR and XPS. It was found that the active components of the catalyst before and after adding La2O3 were in the form of NiAl2O4 ，the forms of NiAl2O4 and Ni，respectively. Adding La2O3 to the catalysts could increase the quantity of the easily reduced Ni，and further improved the catalytic activity. Although adding La decreased the surface areas of the catalysts，the pore structure was improved. The catalyst activity depended on the contents of La2O3. Ni/γ-Al2O3-cordierite structured catalysts with La2O3 of 3% exhibited better catalytic activity and selectivity.

Key words: catalytic hydrogenation；Ni/&gamma, -Al₂O₃；La₂O₃；cordierite honeycomb ceramics

摘要： 研究助剂La₂O₃对Ni/γ-Al₂O₃/堇青石结构化催化剂结构与性能的影响。采用悬浮液涂层法、活性组分浸渍法制备不同La₂O₃助剂含量的Ni/γ-Al₂O₃/堇青石结构化催化剂。通过BET、XRD、TPR、XPS对催化剂进行表征，发现不添加La₂O₃助剂时活性组分以NiAl₂O₄形式存在，添加La₂O₃助剂后则以NiAl₂O₄和NiO两种形式存在，易还原NiO的生成提高了催化剂的活性。添加La₂O₃助剂还能使催化剂的比表面积降低和孔尺寸增大，活性评价表明助剂La₂O₃存在适宜添加量，即La含量为3%。同时发现助剂La₂O₃对选择性的影响大于活性，La₂O₃具有结构助剂的特点。

关键词: 催化加氢, Ni/&gamma, -Al2O3, La2O3, 堇青石蜂窝陶瓷