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冷等离子体是甲烷无氧活化制C2烃较为有效的技术手段之一,由于等离子体反应体系的复杂性,甲烷无氧活化制C2烃反应机理及过程尚不十分清楚。本文采用发射光谱原位诊断技术对冷等离子体作用下甲烷无氧活化制C2烃反应中若干激发态物种进行诊断研究,在250nm～670nm波长范围内检测到下列激发态物种:CH、C和C2。依据激发态物种检测结果、气相色谱反应产物分析结果及等离子体特性,推断了等离子体作用下甲烷无氧活化制C2烃的自由基反应历程。
Cold plasma is one of the more effective techniques for methane to be anaerobically activated to produce C2 hydrocarbons. Due to the complexity of the plasma reaction system, the reaction mechanism and process for producing C2 hydrocarbons by anaerobic methane are not yet clear. In this paper, we used emission spectroscopy in situ diagnosis to diagnose several excited species of C2 hydrocarbon reaction under the action of cold plasma, and detected the following excited species in the wavelength range from 250 nm to 670 nm: CH, C and C2 . Based on the detection results of excited species, the analysis results of gas chromatographic reaction products and the plasma properties, the free radical reaction process of C2-C2-free methane activation under plasma was deduced.