催化学报

催化学报 ›› 2008, Vol. 29 ›› Issue (11): 1145-1151.

• 研究论文 • 上一篇    下一篇

纳米碳纤维负载钯催化剂在Heck反应中的应用：载体相互作用的影响

朱俊1, 赵铁均1,2, Ingvar KVANDE2, 陈德2, 周兴贵1, 袁渭康1   

  1. 1 华东理工大学化学工程联合国家重点实验室, 上海 200237; 2 挪威科技大学化学工程系, 特隆赫姆 7491, 挪威
  • 收稿日期:2008-11-25 出版日期:2008-11-25 发布日期:2012-08-17

Carbon Nanofiber-Supported Pd Catalysts for Heck Reaction: Effects of Support Interaction

ZHU Jun1, ZHAO Tiejun1,2, Ingvar KVANDE2, CHEN De2*, ZHOU Xinggui1#, YUAN Weikang1   

  1. 1 State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China; 2 Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
  • Received:2008-11-25 Online:2008-11-25 Published:2012-08-17

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摘要： 使用多元醇还原法制备了均匀分散的钯纳米颗粒. 将钯纳米颗粒负载于板式、鱼骨式和管式纳米碳纤维,得到稳定、可重复使用的非均相催化剂. 实验结果表明,钯纳米胶粒同载体之间的电位差对钯在载体上的负载量、粒子大小以及Heck反应中钯的溶失量有很大的影响. 在制备过程中,增加钯纳米胶粒同纳米碳纤维表面的电位差能够大大降低钯在Heck反应中的流失. 催化剂的反应活性随钯粒子的增大而降低.

关键词: 纳米碳纤维, 钯, 等电点, Heck反应, 非均相催化剂

Abstract: In order to prepare stable and reusable heterogeneous catalysts, palladium nanop articles were supported on platlet carbon nanofiber (pCNF), fishbone carbon nano fibers (fCNF) and tubular carbon nanofibers (tCNF). It was found that the Pd loa ding and particle size as well as the amount of Pd leaching during the Heck reaction were strongly related to the potential difference between the CNF surf aces and the palladium colloids. Pd leaching in the Heck reaction can be signifi cantly suppressed by increasing potential difference between the CNF surfaces an d the palladium colloids during catalyst preparation. The Pd activity decreased exponentially with the Pd size.

Key words: carbon nanofiber, palladium, point of zero charge, Heck reaction, heterogeneous catalyst