脉冲电晕放电下的甲烷氧化偶联反应(英文)

研究了在常温,常压及惰性气体稀释的条件下,用脉冲电晕放电进行的甲烷氧化偶联（OCM）反应。在各种实验条件下，产物CZ烃由一6o／o乙烯，－70rk乙烷和一87％乙炔组成。甲烷的转化率及CZ烃的生成速率依赖于反应气中甲烷与氧气的比值，它们的流速及直流电源的电压等n通过调节这些实验条件，甲烷转化为C4烃的转化率可得到优化，在45kV高压，30ml。／min的流速下（反应气体组成为95％CHn与50／0O2），CZ烃的最高选择性可达85O／O。当反应气体组成为80％CH4和20O／oOZ时，甲烷的最高转化率达23％。在间歇式反应器中，甲烷转化率随反应时间增长而提高，反应75分钟时甲烷转化率达7lO／O，而CZ烃的产物分布，尤其是乙炔的含量随反应时间增长而明显降低，这些实验结果支持了文献中提出的ZCH4～CZH6—CZH4～CZHZ～CO／COZ反应历程。

OXIDATIVE COUPLING OF METHANE BY PULSED CORONA DISCIIARGES

Oxidative coupling of methane (OCM) at room temperature, under atmospheric pressure and in the absence of inert diluting gas by pulsed corona discharges was investigated. The C2 hydrocarbons, i.e., C2H4, C2H6and C2H2, were produced in a 6 : 7 : 87 mole ratio (approximately) under various experimental conditions studied. The CH4 conversion was found to be dependent on CH4/O2 ratio, flow rate of feed gas, DC source voltage, etc. The CH4 to C2 conversion can be optimized by adjusting these experimental parameters.