冷等离子体条件下乙烷脱氢

Dehydrogenation of Ethane Under Cold Plasma

在低温常压等离子体条件下 ,分别研究了纯乙烷、乙烷在二氧化碳气氛下和乙烷在氢气氛下的脱氢反应。结果表明 :乙烷在上述 3种条件下均可发生脱氢反应 ,主要产物是乙炔和乙烯。在二氧化碳气氛下乙烷转化率随着CO2加入量的增加不断增大。乙炔和乙烯收率则随之呈峰形变化 ,合适的二氧化碳加入量 (摩尔分数 )应为 5 0 %左右。在此体系中加入不同类型催化剂可提高乙烷转化率或乙烯收率 ;在氢气氛下不仅提高乙烷转化率和乙炔、乙烯收率 ,且抑制积碳生成。当氢加入量为 70 %、等离子体注入功率为 16W时 ,乙烷转化率为 5 9 2 % ,乙炔、乙烯收率分别为2 8 7%和 9 6%。

At low temperature and under normal pressure,cold plasma was used for ethane dehydrogenation in systems of pure ethane,ethane-carbon dioxide and ethane-hydrogen,respectively.In pure ethane gas,ethane was mainly converted to ethylene and acetylene.Conversion of ethane and yield of ethylene and acetylene were multiplied as a result of an increase in power input of pulse corona plasma.In ethane-carbon dioxide system,ethane conversion was higher than that in pure ethane gas under the same reaction conditions,and the higher the CO 2 feed concentration,the higher the ethane conversion.The yield of acetylene increased at first and then decreased significantly at a CO 2 concentration of about 50%.The synergism of catalysts and plasma increased ethane conversion or ethylene yield.In an ethane-hydrogen system,conversion of ethane and yield of ethylene and acetylene were promoted rapidly by increasing the input of hydrogen.The formation of carbon was arrested after hydrogen was used as an additional gas.The conversion of ethane was 59 2% and the yield of ethylene and acetylene was 28 7% and 9 6% respectively when the hydrogen concentration was 70% and power input of plasma was 16 W.