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Preparation of Palladium Catalysts Supported on Carbon Nanotubes by an Electrostatic Adsorption Method
Author(s) -
Zhang Liyun,
Wen Guodong,
Liu Hongyang,
Wang Ning,
Su Dang Sheng
Publication year - 2014
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201402175
Subject(s) - adsorption , point of zero charge , cationic polymerization , catalysis , palladium , carbon nanotube , chemistry , inorganic chemistry , carboxylic acid , incipient wetness impregnation , nanoparticle , chemical engineering , materials science , organic chemistry , nanotechnology , engineering , selectivity
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 HNO 3 or HNO 3 /H 2 SO 4 . 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.