添加气对直流等离子体转化甲烷制C_2烃的影响  

Effect of Appended Gas on Methane Converting to C_2 Hydrocarbons under Direct Current Plasma

作　　者：王明章[1] 张秀玲[2] 魏莉[1] 马英冲[1] 牛永进[2] 王少君[1] 余加祐[1] 

机构地区：[1]大连工业大学化工与材料学院,辽宁大连116034 [2]大连大学物理科学与技术学院,辽宁大连116622

出　　处：《化学世界》2008年第6期355-359,368,共6页Chemical World

基　　金：国家自然科学基金(20476013);国家"973"项目:No2005CB221406

摘　　要：在低温（300-500K）常压下，考察了不同性质的添加气二氧化碳（CO2）、氩气（Ar）和氢气（H2）（添加气摩尔浓度0％～80％）对直流冷等离子体转化甲烷制C2烃反应的影响。研究结果表明：CO2虽能在一定程度上提高甲烷转化率，但不利于C2烃的生成；Ar和H2有利于提高甲烷的转化率和C2烃选择性；添加气体对C2产物的分布研究发现：CO2有利于C2H4的生成，添加气Ar不影响产物C2烃的分布，H2在一定程度上促进了C2H4的生成；在实验考察范围内，增加体系的能量密度有利于提高甲烷的转化率；CH4-CO2体系中，C2烃选择性随能量密度的增加而升高；CH4-Ar体系中，C2烃选择性随能量密度的增加变化不大：CH4-H2体系中，C2烃的选择性随能量密度的增加呈现先升后降的趋势。At low temperature （300- 500 K） and atmospheric pressure, the reaction of metnane to C2 hydrocarbons in the presence of appended gas （carbon dioxide, argon and hydrogen）under direct current plasma was investigated. The molar density of the appended gases varied from 0% to 80% in the experiment. The results showed that the selectivity of C2 hydrocarbons was decreased with the increase of the quantity of carbon dioxide, though the conversion of CH4 increased slightly. Both the conversion of CH4 and the selectivity of C2 hydrocarbons were increased in the presence of argon and hydrogen. The experiments also showed that the molar density of ethylene in the C2 hydrocarbons increased distinctly when carbon dioxide concentration increased. Argon and hydrogen caused the distribution of C2 hydrocarbons to change slightly. The selectivity of C2 hydrocarbons increased with energy density in CH4- CO2 system, and it was not affected in CH4-Ar system. A peak appeared in CH4-H2 system with increasing energy density under the experimental conditions.

关 键 词：直流等离子体 添加气 甲烷 C2烃 

分 类 号：TQ039[化学工程]