冷等离子体作用下CH_4-CO_2转化制合成气

在常温常压条件下 ,利用电晕放电 ,使 CH4 - CO2 混合气转化生成合成气 .结果表明 ,该过程中 CH4 和 CO2 的转化率与反应体系能量密度、原料气配比和流速等有关 .在 0 .1MPa气压 ,能量密度为 10 50 k J/ mol(反应体系温度低于 50 0 K) ,n( CH4 )∶ n( CO2 ) =1∶ 2条件下 CH4 和 CO2 的转化率分别超过 60 %和 50 % ,超出了热力学平衡转化率的限制 .通过调配原料的配比 ,可以得到不同 n( H2 ) / n( CO)比值的产物 .对该体系的反应机理进行了探讨 .

Conversion of Methane and Carbon Dioxide to Syngas in Cold Plasma

An experimental investigation on syngas preparation from CH 4 and CO 2 at ambient temperature and pressure in corona plasma has been performed. The conversions of CH 4 and CO 2 were found to be dependent on the energy density(input energy per mole feed), ratio of CH 4 to CO 2 in feed and flow rate of feed gases. For n(CH 4)/n(CO 2)=1/2 at 0.1 MPa and energy density of 1050 kJ/mol(in which temperature was lower than 500 K) the conversions of CH 4 and CO 2 were more than 60% and 50%, respectively. These experimental values exceed the calculated values based on chemical equilibrium theory. The ratio of H 2 to CO in products increased with the increasing of ratio of CH 4 to CO 2 in feed gases. A radical reacti on mechanism was suggested.