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化学学报
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化学学报 ›› 2006, Vol. 64 ›› Issue (11): 1121-1125. 上一篇    下一篇

研究论文

常压辉光放电等离子体转化CH4制C2烃的研究

王达望*，马腾才   

  1. (大连理工大学三束材料改性国家重点实验室 大连 116024)
  • 投稿日期:2005-11-18 修回日期:2006-02-28 发布日期:2006-06-15
  • 通讯作者: 王达望

Glow Discharge Plasma Conversion of Methane to C2 Hydrocarbons at Atmospheric Pressure

WANG Da-Wang*, MA Teng-Cai   

  1. (State Key Laboratory for Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology,
    Dalian 116024)
  • Received:2005-11-18 Revised:2006-02-28 Published:2006-06-15
  • Contact: WANG Da-Wang

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采用新型的旋转电极辉光放电反应器, 在常温常压下对辉光等离子体作用下的甲烷转化制C2烃进行了研究. 在氢气共存条件下, 考察了反应器电极的结构、材料, 输入电场峰值电压和反应物流率等参数对甲烷转化率和C2烃单程收率及其选择性的影响规律, 同时比较了不同反应器的能量效率. 结果表明: 在本实验条件下, 金属铜材料好于不锈钢, 螺旋形结构优于三排圆盘结构. CH4转化率和C2烃选择性和收率均随输入电场峰值电压的升高而增大, 随反应物流量的增加而减小. 从CH4转化率、C2烃的收率和选择性的指标来评价这些反应器, 采用旋转螺旋状铜电极反应器时最好, 当反应物流量为60 mL/min时, 甲烷最高转化率为77.31%, 对应的C2烃收率和选择性分别为75.66%和97.88%; 当能量密度为800 kJ/mol时, 能效最高为13.5%.

关键词: 甲烷, 辉光放电, 旋转电极, 等离子体, C2烃

The experiments of glow discharge plasma conversion of methane to C2 hydrocarbons were conducted by a novel reactor with rotary electrode at room temperature and atmospheric pressure. In the presence of hydrogen, the effects of electrode material and structure, peak voltage input of the electric fields and feed flow rate on methane conversion, single pass yield and selectivity of C2 hydrocarbons were investigated. And the energy efficiency of reactors with different structure was analyzed. On the experimental conditions, the result of copper electrode was better than that of stainless steel electrode and the structure of helix was superior to that of three discs. The conversion of methane, single pass yield and selectivity of C2 hydrocarbons rose with the increase of peak voltage input of the electric fields while fell with the decrease of feed flow rate. The reactor with helix copper electrode worked excellently considering all of the above criterions. The maximum conversion efficiency of methane, the single pass yield and the selectivity of C2 hydrocarbons were about 77.31%, 75.66% and 97.88% respectively at the feed flow rate of 60 mL/min. And the maximum energy efficiency was 13.5% at the 800 kJ/mol energy density.

Key words: methane, glow discharge, rotary electrode, plasma, C2 hydrocarbon