催化学报

催化学报 ›› 2009, Vol. 30 ›› Issue (7): 613-618.

• 研究论文 • 上一篇    下一篇

共沉淀法制备氧化铝负载 Co-Mo 双金属氮化物催化剂

张新波 1,2, 许莉勇 2, 袁俊峰 1, 张雅娟 2, 卢春山 1, 李小年 1   

  1. 1 浙江工业大学工业催化研究所绿色化学合成技术国家重点实验室培育基地, 浙江杭州 310032 2 浙江医药高等专科学校, 浙江宁波 315000
  • 收稿日期:2009-07-25 出版日期:2009-07-25 发布日期:2013-04-24

Preparation of Alumina-Supported Co-Mo Bimetallic Nitride Catalysts by Co-precipitation

ZHANG Xinbo1,2, XU Liyong2, YUAN Junfeng1, ZHANG Yajuan2, LU Chunshan1, LI Xiaonian1,*   

  1. 1State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, Institute of Industrial Catalysis, Zhejiang University of Technology, Hangzhou 310012, Zhejiang, China 2Zhejiang Pharmaceutical College, Ningbo 315000, Zhejiang, China
  • Received:2009-07-25 Online:2009-07-25 Published:2013-04-24

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1748

被引次数

57

摘要： 采用硝酸铝和硝酸钴的乙醇溶液与钼酸铵的碳酸铵水溶液共沉淀制备了 Al2O3 负载 Co-Mo 双金属氧化物前驱体, 结合氨程序升温还原法制得了氮化物催化剂 Co-Mo-N/Al2O3. 利用 X 射线衍射和N2 物理吸附方法表征了制备的前驱体和钝化态 Co-Mo-N/Al2O3催化剂的晶相和孔结构, 用程序升温脱附、程序升温表面反应及扫描电子显微镜考察了共沉淀法和浸渍法制备的催化剂的晶格稳定性、活性中心和表面形貌, 用氨分解反应表征了 Co-Mo-N/Al2O3 催化剂的活性. 结果表明, 焙烧温度对催化剂比表面积有较大影响, 低温焙烧的样品中活性组分散性较好, 673 K 焙烧制得催化剂的氨分解活性最高. 与浸渍法制备的 Co-Mo-N/Al2O3 催化剂相比, 共沉淀法制备的催化剂具有更高的晶格稳定性、更均匀的活性组分分布和更高的氨分解活性.

关键词: 钴, 钼, 氧化铝, 氨分解, 共沉淀法, 浸渍法

Abstract: The alumina-supported Co-Mo bimetallic oxide precursor was prepared by coprecipitation of ethanolic solution of Al(NO3)3 and Co(NO3)2, and aqueous solution of (NH4)2CO3 and (NH4)6Mo7O24. The precursor was then reduced to Co-Mo bimetallic nitride catalyst by NH3 temperature-programmed reaction. This nitride catalyst has higher activity, higher crystal stability, and more uniform dispersion of the active components than the sample prepared by impregnation.

Key words: cobalt, molybdenum, alumina, ammonia decomposition, coprecipitation method, impregnation method