物理化学学报 >> 2009, Vol. 25 >> Issue (05): 825-828.doi: 10.3866/PKU.WHXB20090514

研究论文 上一篇    下一篇

Pd/SWNTs负载型催化剂的制备及其催化性能

曹优明 王志永 施祖进 顾镇南   

  1. 北京大学化学与分子工程学院, 北京分子科学国家实验室, 稀土材料化学及应用国家重点实验室, 北京100871; 重庆文理学院化学与环境工程学院, 重庆 永川 402168
  • 收稿日期:2008-12-19 修回日期:2009-01-21 发布日期:2009-05-04
  • 通讯作者: 曹优明 施祖进 E-mail:zjshi@pku.edu.cn; caoyouming121@163.com

Preparation and Catalytic Properties of SWNTs-Supported Pd Catalyst

 CAO You-Ming, WANG Zhi-Yong, SHI Zu-Jin, GU Zhen-Nan   

  1. State Key Laboratory of Rare Earth Materials Chemistry and Applications, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China; College of Chemistry and Environment Engineering, Chongqing University of Arts and Sciences, Yongchuan 402168, Chongqing, P. R. China
  • Received:2008-12-19 Revised:2009-01-21 Published:2009-05-04
  • Contact: CAO You-Ming SHI Zu-Jin E-mail:zjshi@pku.edu.cn; caoyouming121@163.com

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摘要：

利用单壁碳纳米管(SWNTs)自身的还原性, 将PdCl2溶液中的Pd2+直接还原成金属Pd负载在SWNTs表面上, 制备了具有良好催化性能的Pd/SWNTs负载型催化剂. 通过透射电镜(TEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)和热重分析(TG)对Pd/SWNTs 进行了表征, 并利用Suzuki反应对Pd/SWNTs的催化性能进行了测试. 实验结果表明, 用SWNTs与12 mmol·L-1的PdCl2的水溶液直接作用, 得到Pd/SWNTs催化材料的Pd负载量达到14.13%(w, 质量分数), 颗粒分散均匀, 粒径小(2 nm左右), 与SWNTs结合紧密; 用经过H2还原的Pd/SWNTs作催化剂, 在90 ℃下进行Suzuki反应, 30 min后反应就基本完成, 其联苯的产率达到98.10%, 催化活性较高, 可望广泛用于有机合成反应.

关键词: 单壁碳纳米管, 负载, Pd, 催化性能

Abstract:

A Pd catalyst supported by single-walled carbon nanotubes (SWNTs) was prepared by a redox reaction between SWNTs and PdCl2 solution. The supported catalyst was characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and thermo-gravimetric (TG) techniques. Results showed that large quantities of Pd particles with diameters of ca 2 nm distributed evenly on the surface of SWNTs and the content of Pd was 14.13% (w, mass fraction) when using SWNTs and 12 mmol·L-1 PdCl2 as reactants. The supported catalyst, after reduction by H2, exhibited high catalytic activity in Suzuki reaction. The yield of biphenyl was 98.10% after 30 min reaction at 90 ℃.

Key words: Single-walled carbon nanotubes, Support, Pd, Catalytic property