催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (6): 509-513.

• 研究论文 • 上一篇    下一篇

磁性纳米颗粒负载钯催化剂对Heck反应的催化活性

沈彬1,李游1,王志飞1,何农跃2   

  1. 1 东南大学化学化工学院, 江苏南京 211189; 2 东南大学生物电子国家重点实验室, 江苏南京 210096
  • 收稿日期:2007-06-25 出版日期:2007-06-25 发布日期:2011-05-28

Catalytic Activity of Palladium Supported on Magnetic Nanoparticles for Heck Reaction

SHEN Bin1*, LI You1, WANG Zhifei1, HE Nongyue2   

  1. 1 School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, Jiangsu, China; 2 State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, Jiangsu, China
  • Received:2007-06-25 Online:2007-06-25 Published:2011-05-28

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1212

被引次数

61

摘要： 采用水热法合成了碳包埋磁性纳米复合颗粒C/(Au@Fe), 并以之为载体制备了纳米钯催化剂,利用透射电镜、X射线光电子能谱和振动样品磁强计等手段对催化剂进行了表征,评价了催化剂对Heck反应的催化活性. 结果表明,催化剂的平均粒径约为300 nm, 表面覆盖着一层粒径为12 nm的钯颗粒,整个催化剂呈现超顺磁性. 对于碘代苯与丙烯酸之间的Heck反应,在乙酸钠或三乙胺碱性条件下反应4 h, 碘代苯转化率可达95%以上. 催化剂重复使用10次时仍可保持很高的催化活性(碘代苯转化率88%). 对于其他不同反应底物之间的Heck反应,催化剂同样显示有较高的催化活性. 催化剂可稳定分散于反应体系中,并可在外磁场作用下快速与反应体系分离.

关键词: 钯, 负载型催化剂, 磁性纳米复合颗粒, 水热法, 碘代苯, 丙烯酸, Heck反应

Abstract: Carbon-enclosed magnetic nanoparticles synthesized by the hydrothermal method were used as a support for the palladium nanoparticle catalyst. The catalyst samples were characterized by transmission electron microscopy,X-rayphotoelectron spectroscopy, and a vibration sample magnetometer. Its catalytic activity for the Heck coupling reaction was measured. The results showed that the mean catalyst particle size was 300 nm, the surface was covered with a layer of palladium particles (12 nm), and the catalyst was of superparamagnetic property. In the Heck reaction of iodobenzene and acrylic acid catalyzed by the catalyst, high iodobenzene conversion (more than 95%) could be obtained under the base conditions of both CH3COONa and NEt3 after 4 h. The iodobenzene conversion over the catalyst was about 88% after 10 recycles, and the catalyst could be steadily dispersed in the reaction mixture and be separated by the magnetic field added.

Key words: palladium, supported catalyst, magnetic nanocomposite, hydrothermal method, iodobenzene, acrylic acid, Heck reaction