La2O3助剂对Ni/γ-Al2O3/堇青石结构化催化剂催化加氢合成间苯二胺性能的影响

化工进展 ›› 2012, Vol. 31 ›› Issue (01 ): 122-125.

La2O3助剂对Ni/γ-Al2O3/堇青石结构化催化剂催化加氢合成间苯二胺性能的影响

刘少文1，2，涂文艳2，包传平2

（1黄冈师范学院化工学院，湖北黄冈 438000；2武汉工程大学化工与制药学院，绿色化工过程省部共建教育部重点实验室，湖北武汉 430073）

出版日期:2012-01-05 发布日期:2012-01-05

Effect of La₂O₃ on the properties of Ni/γ-Al₂O₃/cordierite structured catalysts for hydrogenation of MDN to MPDA

LIU Shaowen1，2，TU Wenyan 2，BAO Chuanping 2

（1College of Chemical Engineering，Huanggang Normal University，Huanggang 438000，Hubei，China； 2Key Laboratory for Green Chemical Process of Ministry of Education，School of Chemical Engineering & Pharmacy， Wuhan Institute of Technology，Wuhan 430073，Hubei，China）

Online:2012-01-05 Published:2012-01-05

摘要/Abstract

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

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

刘少文1，2，涂文艳2，包传平2. La2O3助剂对Ni/γ-Al2O3/堇青石结构化催化剂催化加氢合成间苯二胺性能的影响[J]. 化工进展, 2012, 31(01 ): 122-125.

LIU Shaowen1，2，TU Wenyan 2，BAO Chuanping 2. Effect of La₂O₃ on the properties of Ni/γ-Al₂O₃/cordierite structured catalysts for hydrogenation of MDN to MPDA[J]. Chemical Industry and Engineering Progree, 2012, 31(01 ): 122-125.

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