介质阻挡放电常压低温等离子体转化甲烷制C2及高碳烃的研究

对介质阻挡放电(DBD)反应器用于甲烷常压低温等离子体转化过程,分别就停留时间、输入功率、内电极材料及温度、介质厚度等对反应的影响进行了研究。实验结果表明,甲烷转化率随停留时间、输入功率的增加而增加,但增加的幅度逐渐减小。内电极材料对反应积炭有很大的影响。紫铜和紫铜(镀银)材料能够有效地抑制积炭的产生,从而可以增加反应寿命,还对甲烷转化率有很大的影响。较低的内电极温度可以抑制积炭,但是甲烷转化率有所降低,同时液态高碳烃选择性增加。在甲烷流量较低时介质厚度对反应的影响很小,但随着甲烷流量的提高会逐渐增大,并且介质厚度越小,甲烷转化率越高。

Methane Conversion to C2 and Higher Hydrocarbons via Dielectric-Barrier Discharge Plasma at Atmospheric Pressure

Methane conversion to C2 and higher hydrocarbons via dielectric-barrier discharge(DBD) plasma was studied at atmospheric pressure and near room temperature.Influence of residence time,input power,materials and dielectric thickness of inner electrode and temperature on methane(conversion) was investigated.Experiment results showed that the increase of both residence time and input power could increase methane conversion.It was found that the inner electrode materials had some effects on restraining carbon deposition since copper or silver-gilt copper inner electrode could prolong reaction time and increase methane conversion.Cooling the inner electrode by flowing cold water inside could restrain carbon deposition,decrease methane conversion and increase selectivity of higher liquid hydrocarbons.The dielectric thickness had little effect on the reaction at low methane flow rate,but had significant effect at high methane flow rate.Methane conversion increased with(dielectric) thickness decreasing at high methane flow rate.