放电条件下SF_5CF_3的分解反应  

Dissociation of SF_5CF_3 Under Discharge

作　　者：张建良[1] 张仁熙[1] 黄丽[1] 侯惠奇[1] 

机构地区：[1]复旦大学环境科学研究所,上海200433

出　　处：《环境科学》2005年第2期50-54,共5页Environmental Science

基　　金：国家自然科学基金资助项目 (2 0 1770 0 4)

摘　　要：SF5CF3 是近年被发现的具有强红外辐射强迫、长寿命的新温室气体 .本文利用火花放电技术模拟研究了放电条件下SF5CF3 的去除机理 .结果表明 ,SF5CF3 在放电过程中将被分解并生成多种含硫、氟、氧和碳的化合物 .H2 O的存在能够降低SF5CF3 的分解速率 ,但降低的量与H2 O的分压无关 .在有H2 O存在的条件下 ,当体系总压约为 31kPa时 ,闪电过程中SF5CF3的分解速率常数分别为 0 . 0 11s-1.同时 ,SF5CF3 的分解率随着体系的总压上升而呈指数下降 .基于实验结果 ,对SF5CF3 在放电过程中的反应途径作了探讨 ,并估算实际大气中放电的一种形式———闪电所引起的SF5CF3 的分解量为 5 3. 6kg·a-1.SF_5CF_3 was identified recently as a potent greenhouse gas with strong radiative force and long atmosphere residential life. Spark discharge method was used to take simulative investigation on the elimination of SF_5CF_3 from atmosphere under discharge here. The results show that SF_5CF_3 was dissociated under discharge and formed some compounds containing S, F, O and C. The dissociation of SF_5CF_3 was reduced if the system existed H_2O, but it was independent of the amount of H_2O. The rate coefficients were estimated to be 0.011s -1 under moisture circumstance when the system total pressure was about 31 kPa. And the increase of the system pressure would cause exponential decrease of SF_5CF_3 dissociation. The reactive mechanism was argued based on the experiment results and the sinks of SF_5CF_3 under lightning (one of the discharge in the atmosphere) was estimated to be 53.6 kg·a -1

关 键 词：火花放电 SF5CF3 辐射强迫 分解 汇 

分 类 号：X131.1[环境科学与工程—环境科学]