高等学校化学学报

高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (7): 1317.

• 研究论文 • 上一篇    下一篇

猝冷速度对骨架Ni催化剂结构和催化性能的影响

胡华荣1, 方敬1, 乔明华1, 闫世润1, 范康年1, 李和兴2, 宗保宁3, 张晓昕3   

  1. 1. 上海市分子催化和创新材料重点实验室,复旦大学化学系,上海200433;
    2. 上海师范大学化学系,上海200234;
    3. 北京石油化工科学研究院,北京100083
  • 收稿日期:2004-07-07 出版日期:2005-07-10 发布日期:2005-07-10
  • 通讯作者: 范康年(1943年出生),男,教授,博士生导师,从事量子化学理论及催化研究.E-mail:knfan@fudan.edu.Cn E-mail:knfan@fudan.edu.Cn
  • 基金资助:

    国家“九七三”重点基础研究发展规划项目(批准号:G2000048009);国家自然科学基金(批准号:20203004);上海市科委资助项目(批准号:02ZA14006,03QB14004);复旦大学研究生创新基金资助.

Effect of Rapid Quenching Speed on the Structure and Catalytic Properties of the Skeletal Ni Catalysts

HU Hua-Rong1, FANG Jing1, QIAO Ming-Hua1, YAN Shi-Run1, FAN Kang-Nian1, LI He-Xing2, ZONG Bao-Ning3, ZHANG Xiao-Xin3   

  1. 1. Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200433, China;
    2. Department of Chemistry, Shanghai Normal University, Shanghai 200234, China;
    3. Research Institute of Petroleum Processing, Beijing 100083, China
  • Received:2004-07-07 Online:2005-07-10 Published:2005-07-10

PDF (PC)

被引次数

11

摘要： 在5种不同猝冷速度下制备Ni-Al合金,然后以碱处理并活化得到多孔猝冷骨架Ni催化剂.通过电感耦合等离子发射光谱(ICP)、X射线粉末衍射(XRD)、H2-程序升温脱附(H2-TPD)和氮物理吸附等方法对催化剂的物理化学性质进行了表征.结果发现,随着冷却速度的增加,活化后的催化剂具有更多的残余Ni2Al3相、更低的比表面积、更大的孔容和孔径、更小的Ni晶粒、更大的Ni-Ni间距和更加单一的活性位.另外,还发现在肉桂醛选择加氢反应中,冷却速度的提高也促进了催化剂的活性和对目标产物3-苯丙醛选择性的提高.以RQNi5为催化剂,加氢产物3-苯丙醛的收率达到88.8%,转化率为98.4%,明显优于工业上广泛使用的RaneyNi催化剂.同时,对猝冷骨架Ni催化剂的结构与催化性能之间的关系进行了讨论.

关键词: 猝冷, 冷却速度, RaneyNi, 肉桂醛, 选择加氢

Abstract: A series of rapidly quenched skeletal Ni catalysts were prepared by alkali leaching of Ni-Al alloys solidified at different cooling rates. It has been found that the higher cooling rate leads to more residual Ni2Al3 phase, lower surface area, larger average pore size and porosity, smaller mean crystallite size, larger unit-cell parameter and more uniform active site. The relationship between the structure and catalytic behavior of the rapidly quenched skeletal Ni was discussed by using cinnamaldehyde selective hydrogenation as the probe reaction.

Key words: Rapid quenching, Cooling rate, Raney Ni, Cinnamaldehyde, Selective hydrogenation

中图分类号: 

TrendMD: