Preparation of Palladium Catalysts Supported on Carbon Nanotubes by an Electrostatic Adsorption Method

Authors

  • Liyun Zhang,

    1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016 (P.R. China), Fax: (+86) 24-83970019
    2. Graduate University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049 (P.R. China)
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  • Dr. Guodong Wen,

    1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016 (P.R. China), Fax: (+86) 24-83970019
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  • Dr. Hongyang Liu,

    1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016 (P.R. China), Fax: (+86) 24-83970019
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  • Prof. Ning Wang,

    1. Department of Physics, The Hong Kong University of Science and Technology, Hong Kong (P.R. China)
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  • Prof. Dang Sheng Su

    Corresponding author
    1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016 (P.R. China), Fax: (+86) 24-83970019
    • Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016 (P.R. China), Fax: (+86) 24-83970019

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Abstract

Pd nanoparticles supported on carbon nanotubes (CNTs) with an average Pd size of around 1 nm were synthesized successfully by a facile strong electrostatic adsorption (SEA) method. CNTs functionalized with various surface oxygen functional groups (SFGs) were obtained by treating the raw CNTs with concentrated HNO3 or HNO3/H2SO4. The SFGs could decrease the point of zero charge (PZC) of the CNTs and promoted the adsorption of Pd cationic complexes on the CNTs. In particular, the intrinsic and in situ formed (hydrolyzed from carboxylic anhydride groups) carboxylic acid groups of the CNTs during the adsorption process mainly influenced the adsorption of Pd cationic complexes. The SEA method was superior to the traditional incipient wetness impregnation method for the synthesis of highly dispersed Pd catalysts, which exhibited a high specific activity for the Suzuki coupling reaction.

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