甲烷二氧化碳介质阻挡放电转化产物分布研究  

Product Distribution of Conversions of Methane and Carbon Dioxide Using Dielectric Barrier Discharge

作　　者：邹吉军[1] 李阳[1] 张月萍[2] 刘昌俊[1] 

机构地区：[1]天津大学化工学院 [2]天津大学化学系,天津300072

出　　处：《物理化学学报》2002年第8期759-763,共5页Acta Physico-Chimica Sinica

基　　金：国家重点基础研究发展规划G1999022402)资助项目

摘　　要：针对介质阻挡放电甲烷二氧化碳转化实验,分析了反应的产物分布,探讨了进料组成和反应器结构对反应的影响.反应产物包括:高H2/CO摩尔比的合成气、气态烃、高辛烷值的汽油组分、醇和酸等含氧有机物.对所述电极结构,产物的选择性随碳数增加而降低;高的甲烷进料浓度有利于烃的生成,对醇和酸的最佳甲烷进料体积分数范围在67.4%～75.1%;放电间隙越小,原料转化率和烃、酸的选择性越大,大的放电间隙对醇的生成有利.Direct conversion of methane to more useful chemicals and fuels remains a challenge for the 21st century because of the high stability of methane molecule. In this work, direct conversion of methane and carbon dioxide using dielectric barrier discharge plasma was investigated. The discharge gaps applied are 1. 8 mm and 1. 1 mm, respectively. The product includes gaseous hydrocarbons (C-2 to C-5), syngas, liquid hydrocarbons (C-5 to C-11) and oxygenates. The liquid hydrocarbons are highly branched which presents a high octane number as liquid fuel; and oxygenates mainly consist of alcohols and acids. With the increasing of carbon atoms in the molecule, selectivity of hydrocarbons and oxygenates decreases accordingly. A detailed analysis of product distribution has been conducted under variable feed conditions with different discharge gaps. Higher CH4 concentration in the feed is more favored for production of hydrocarbons, while the highest selectivity of alcohols and acids is obtained at the methane feed concentration of 75.1% (volume fraction) and 67.4% (vulume fraction), respectively. To achieve a large conversion of CH4 and CO2 and a high yield of hydrocarbons and acids, the narrower discharge gap (1. 1 mm) is preferred, while a wider discharge gap (1. 8 mm) induces a more selectivity production of alcohols.

关 键 词：产物分布 甲烷 二氧化碳 介质阻挡放电 低温等离子体 

分 类 号：O621.3[理学—有机化学]