有氧气氛下等离子体甲烷偶联反应的研究

近年来，非平衡等离子体应用于甲烷直接转化的研究备受关注，但多数研究工作采用的是低气压下微波或高频放电产生的非平衡等离子体1－9].在常压下获得非平衡等离子体一般是通过脉冲电晕放电或介质阻挡放电产生的10,11].Liu等12]采用电晕放电（非脉冲）研究了CH4＋O2＋He(pCH4=2.03×104Pa，pO2=5.07×103Pa，He平衡)体系的甲烷偶联反应.　　如前文13]所述，脉冲电晕等离子体是一种新型常压非平衡等离子体，其电子通过上升沿陡峭的窄脉冲电场加速而获得能量（1～20eV）.将其应用于甲烷偶联反应，不仅具有反应条件温和（常温常压）…

Study on Coupling of Methane under Pulse Corona Plasma in the Presence of Oxygen

The coupling of methane in the presence of oxygen under pulse corona plasma was examined under normal pressure and at ambient temperature. Experimental results show that composition and distribution of C2 products in the presence of oxygen is similar to that in the absence of oxygen. With increasing energy input to the plasma reactor,methane conversion,oxygen conversion and C2 yield were enhanced. Increasing the O2/CH4 ratio gave higher conversions of methane and oxygen. The yield of C2 products increased slightly only in the range of O2/CH4 ratio less than 0.16 when feeding with a mixture of methane and oxygen. If oxygen is introduced at the end of the methane plasma,a higher C2 yield and lower CO yield can be obtained and CO2 can not be detected in the product.