SCI和EI收录∣中国化工学会会刊

Chin.J.Chem.Eng. ›› 2016, Vol. 24 ›› Issue (4): 484-490.DOI: 10.1016/j.cjche.2015.11.028

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Oxygen and nitrogen-doped metal-free carbon catalysts for hydrochlorination of acetylene

Tongtong Zhang, Jia Zhao, Jiangtao Xu, Jinhui Xu, Xiaoxia Di, Xiaonian Li   

  1. Industrial Catalysis Institute of Zhejiang University of Technology, Hangzhou 310014, China
  • Received:2015-05-27 Revised:2015-09-14 Online:2016-05-27 Published:2016-04-28
  • Contact: Xiaonian Li
  • Supported by:

    Supported by the National Natural Science Foundation of China (21476207) and the National Basic Research Program of China (2011CB710800).

Oxygen and nitrogen-doped metal-free carbon catalysts for hydrochlorination of acetylene

Tongtong Zhang, Jia Zhao, Jiangtao Xu, Jinhui Xu, Xiaoxia Di, Xiaonian Li   

  1. Industrial Catalysis Institute of Zhejiang University of Technology, Hangzhou 310014, China
  • 通讯作者: Xiaonian Li
  • 基金资助:

    Supported by the National Natural Science Foundation of China (21476207) and the National Basic Research Program of China (2011CB710800).

Abstract: Activated carbon was tested as metal-free catalyst for hydrochlorination of acetylene in order to circumvent the problem of environment pollution caused by mercury and high cost by noble metals. Oxygen-doped and nitrogen-doped activated carbons were prepared and characterized by XPS, TPD and N2 physisorption methods. The influences of the surface functional groups on the catalytic performancewere discussed base on these results. Among all the samples tested, a nitrogen-doped sample, AC-n-U500, exhibited the best performance, the acetylene conversion being 92% and vinyl chloride selectivity above 99% at 240℃ and C2H2 hourly space velocity 30 h-1. Moreover, the AC-n-U500 catalyst exhibited a stable performance during a 200 h test with a conversion of acetylene higher than 76% at 210℃ at a C2H2 hourly space velocity 50 h-1. In contrary, oxygen-doped catalyst had lower catalytic activities. A linear relationship between the amount of pyrrolic-N and quaternary-N species and the catalytic activity was observed, indicating that these nitrogen-doped species might be the active sites and the key in tuning the catalytic performance. It is also found that the introduction of nitrogen species into the sample could significantly increase the adsorption amount of acetylene. The deactivation of nitrogendoped activated carbon might be caused by the decrease of the accessibility to or the total amount of active sites.

Key words: Acetylene hydrochlorination, Activated carbon, Surface chemistry, Oxygenated group, Nitrogen-doped

摘要: Activated carbon was tested as metal-free catalyst for hydrochlorination of acetylene in order to circumvent the problem of environment pollution caused by mercury and high cost by noble metals. Oxygen-doped and nitrogen-doped activated carbons were prepared and characterized by XPS, TPD and N2 physisorption methods. The influences of the surface functional groups on the catalytic performancewere discussed base on these results. Among all the samples tested, a nitrogen-doped sample, AC-n-U500, exhibited the best performance, the acetylene conversion being 92% and vinyl chloride selectivity above 99% at 240℃ and C2H2 hourly space velocity 30 h-1. Moreover, the AC-n-U500 catalyst exhibited a stable performance during a 200 h test with a conversion of acetylene higher than 76% at 210℃ at a C2H2 hourly space velocity 50 h-1. In contrary, oxygen-doped catalyst had lower catalytic activities. A linear relationship between the amount of pyrrolic-N and quaternary-N species and the catalytic activity was observed, indicating that these nitrogen-doped species might be the active sites and the key in tuning the catalytic performance. It is also found that the introduction of nitrogen species into the sample could significantly increase the adsorption amount of acetylene. The deactivation of nitrogendoped activated carbon might be caused by the decrease of the accessibility to or the total amount of active sites.

关键词: Acetylene hydrochlorination, Activated carbon, Surface chemistry, Oxygenated group, Nitrogen-doped