物理化学学报 >> 2004, Vol. 20 >> Issue (09): 1078-1082.doi: 10.3866/PKU.WHXB20040904

研究论文 上一篇    下一篇

气体放电对SO2和SO32-氧化的影响

任家荣;刘霁欣;李瑞年;赵璧英;谢有畅   

  1. 北京大学化学与分子工程学院,分子动态与稳态结构国家重点实验室,北京 100871;
  • 收稿日期:2004-01-29 修回日期:2004-04-16 发布日期:2004-09-15
  • 通讯作者: 谢有畅 E-mail:yxie@pku.edu.cn

Influences on Oxidation of SO2 and SO32- by Gas Discharge

Ren Jia-Rong;Liu Ji-Xin;Li Rui-Nian;Zhao Bi-Ying;Xie You-Chang   

  1. State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871; Department of Applied Physics, Beijing Institute of Technology, Beijing 100081
  • Received:2004-01-29 Revised:2004-04-16 Published:2004-09-15
  • Contact: Xie You-Chang E-mail:yxie@pku.edu.cn

摘要: 研究气体放电对SO2和亚硫酸盐氧化的影响,采用了直流电源和交直流叠加电源进行气体放电.结果表明,气体放电对于SO2氧化促进作用很少;但对溶液中的SO32-的氧化则有明显促进作用.通过对两个反应过程的机理分析,认为亚硫酸盐溶液氧化快是因为气体放电产生的OH等自由基和液相里的亚硫酸根起作用,引发链反应,促进了溶液中四价硫被空气中的O2氧化为六价硫的过程.而气相中的SO2与OH等自由基作用不能形成链反应,所以影响不明显.实验表明,选择交直流叠加电源进行气体放电比用纯粹直流电源放电效果更好.

关键词: 气体放电, 氧化, 非热等离子体, 交直流叠加电源

Abstract: Oxidation effects of SO2 and SO32- by gas discharge were studied. Powers of both DC and DC superimposed AC were used to generate gas discharge. The results show that the gas discharge had no effect on SO2 oxidation in gas phase and enhanced oxidation of SO32- in solution evidently. The enhancement of SO32- in solution is attributed to that gas discharge can generate free radical OH. The free radical can react with SO32- in solution to induce a chain reaction, in which SO32- is oxidized by O2 in air. But the free radical cannot induce a chain reaction in gas phase, which contains SO2. In the meanwhile, gas discharge by power of DC superimposed AC can have a better effect than by power of DC.

Key words: Gas discharge, Oxidation, Non-thermal plasma, DC superimposed AC