放电条件下SF5CF3的分解反应

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.H₂O的存在能够降低SF₅CF₃的分解速率,但降低的量与H₂O的分压无关. 在有H₂O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0.011s^-.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53.6 kg·a^-.

Dissociation of SF5CF3 Under Discharge

SF₅CF₃ 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 SF₅CF₃ from atmosphere under discharge here. The results show that SF₅CF₃ was dissociated under discharge and formed some compounds containing S, F, O and C. The dissociation of SF₅CF₃ was reduced if the system existed H₂O, but it was independent of the amount of H₂O. The rate coefficients were estimated to be 0.011s^- under moisture circumstance when the system total pressure was about 31 kPa. And the increase of the system pressure would cause exponential decrease of SF₅CF₃ dissociation. The reactive mechanism was argued based on the experiment results and the sinks of SF₅CF₃ under lightning (one of the discharge in the atmosphere) was estimated to be 53.6 kg·a^-.