摘要
研究常温常压下，脉冲电晕等离子体对温室气体ＣＯ２的活化与转化．分别考察了纯ＣＯ２气体、ＣＯ２－Ｈ２、ＣＯ２－ＣＨ４体系中ＣＯ２的转化．纯ＣＯ２气体放电，ＣＯ２主要分解为ＣＯ和Ｏ２，ＣＯ的选择性在７０％以上，随着脉冲电压峰值的增加，ＣＯ２转化率、ＣＯ产率有所提高．ＣＯ２－Ｈ２体系中，ＣＯ２转化率、ＣＯ产率明显高于单纯ＣＯ２体系，且随着Ｈ２／ＣＯ２摩尔比值的增大而升高．ＣＯ２－ＣＨ４体系中，ＣＯ２＋ＣＨ４→２ＣＯ＋２Ｈ２反应与ＣＨ４→１／２Ｃ２、Ｃ反应（ＣＨ４脱氢偶联与析炭反应）并存．适宜的ＣＨ４／ＣＯ２摩尔比值（１．０—１．７）可以促进ＣＯ２＋ＣＨ４→２ＣＯ＋２Ｈ２反应，抑制ＣＨ４→１／２Ｃ２。
At atmospheric pressure and ambient temperature,conversion of CO 2 by using pulse corona plasma has been studied.The conversion of CO 2 to CO in a pure CO 2,CO 2 H 2 or CO 2 CH 4 gas was investigated,respectively.In a pure CO 2 gas,it was found that the CO 2 gas mainly transferred to CO and O 2.The selectivity of CO is over 70%.CO 2 conversion and CO yield are promoted with increasing peak value of pulse voltage.In a CO 2 H 2 gas,CO 2 conversion and CO yield are much higher than those in a pure CO 2 gas.Moreover,they increase with incressing the molar ratio of H 2 to CO 2.In a CO 2 CH 4 gas,it was revealed that the two reactions are in parallel:CO 2+CH 4→2CO+2H 2 and CH 4→1/2C 2,C.The molar ratio of CH 4 to CO 2 being from 1 0 to 1 7,the former is enhanced and the latter is restrained.
出处
《环境科学》
EI
CAS
CSSCI
CSCD
北大核心
1998年第2期20-23,共4页
Environmental Science
关键词
非平衡等离子体
二氧化碳转化
大气污染
CO 2 conversion,non equilibrium plasma,pulse corona discharge,atmospheric pressure.
