The catalytic pathways of hydrohalogenation over metal-free nitrogen-doped carbon nanotubes.
Nitrogen-doped carbon nanotubes (N-CNTs) are found to be active as one novel heterogeneous catalyst for acetylene hydrochlorination reaction, possessing good activity (TOF=2.3×10(-3)  s(-1) ) and high selectivity (>98 %). Compared to toxic and energy-consuming conventional catalysts, such as HgCl2 , N-CNTs are more favorable in terms of sustainability, because of their thermo-stability, metal-free make up, and the wide availability of bulk CNT. Coupling X-ray photoelectron spectroscopy and density functional theory computations (DFT), the main active source and reaction pathway are shown. Good linearity between the quaternary nitrogen content and conversion is revealed. DFT study shows that the nitrogen doping enhanced the formation of the covalent bond between C2 H2 and NCNT compared with the undoped CNT, and therefore promoted the addition reaction of the C2 H2 and HCl into C2 H3 Cl.
Beijing Key Laboratory of Green Chemical Reaction, Engineering and Technology, Department of Chemical Engineering, Tsinghua University, 100084 Beijing (PR China), Fax: (+86) 10-6277-2051.
Kai
K
Zhou
Bo
B
Li
Qiang
Q
Zhang
Jia-Qi
JQ
Huang
Gui-Li
GL
Tian
Jin-Chao
JC
Jia
Meng-Qiang
MQ
Zhao
Guo-Hua
GH
Luo
Dang Sheng
DS
Su
Fei
F
Wei
D002384:Catalysis; D054879:Halogenation; D006865:Hydrogenation; D008958:Models, Molecular; D008968:Molecular Conformation; D037742:Nanotubes, Carbon / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry*; D011789:Quantum Theory
D037742:Nanotubes, Carbon; D009584:Nitrogen
carbon nanotubes; ethene; hydrochlorination; mercury; sustainable chemistry