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通过优化设计矩形波导谐振腔微波化学反应器,可以大幅提高微波等离子体下甲烷转化率(最高为93.7%)、C2烃收率(最高为91.0%)和乙炔收率(最高为88.6%).且优化后,在实验的压强范围内,甲烷转化率和C2烃收率较为稳定,C2烃主要是乙炔,其选择性都在90%以上.生成乙炔的能量产率和时空产率也都比较高.利用发射光谱法对微波等离子体下甲烷偶联制乙炔的反应进行了诊断研究,在300nm～750nm波长范围内激发态物种有:CH,C2,H2,Hα.根据反应产物和激发态物种从化学反应热力学和动力学上对反应机理进行了初步探索.
By optimizing the design of Rectangular waveguide cavity microwave chemical reactors, methane conversion (up to 93.7%), C2 hydrocarbon yield (up to 91.0%) and acetylene yield (up to 88.6%) under microwave plasma can be dramatically increased. After optimization, the conversion of methane and the yield of C2 hydrocarbons are relatively stable under the experimental pressure range, and the C2 hydrocarbons are mainly acetylene with the selectivity above 90%. The energy yield and space-time yield of acetylene are also both Is relatively high.Using emission spectroscopy to diagnose the reaction of acetylene with methane under microwave plasma, the excited species in the wavelength range from 300nm to 750nm are: CH, C2, H2, Hα.According to the reaction product and excited state Species from the chemical reaction thermodynamics and kinetics of the reaction mechanism was initially explored.