化学学报 ›› 2008, Vol. 66 ›› Issue (2): 158-164. 上一篇    下一篇

研究论文

CH3SOx (x=0, 1)与三线态Oy (y=1, 2, 3)反应机理的理论研究

樊红敏1,2,李晓艳1,3,曾艳丽1,郭绍福1,郑世钧1,孟令鹏*,1   

  1. (1河北师范大学计算量子化学研究所 石家庄 050016)
    (2中国电子科技集团公司第十八研究所 天津 300381)
    (3中国科学院研究生院化学与化学工程学院 北京 100049)
  • 投稿日期:2007-07-21 修回日期:2007-09-06 发布日期:2008-01-28
  • 通讯作者: 孟令鹏

Theoretical Study on the Reaction Mechanism of CH3SOx (x=0, 1) and 3Oy (y=1, 2, 3)

FAN Hong-Min1,2 LI Xiao-Yan1,3 ZENG Yan-Li1 GUO Shao-Fu1 ZHENG Shi-Jun1 MENG Ling-Peng*,1   

  1. (1 Institute of Quantum Chemistry, College of Chemistry, Hebei Normal University, Shijiazhuang 050016)
    (2 Tianjin Institute of Power Sources, Tianjin 300381)
    (3 College of Chemistry and Chemical Engineering, Graduate University of Chinese Academy of Sciences, Beijing 100049)
  • Received:2007-07-21 Revised:2007-09-06 Published:2008-01-28
  • Contact: MENG Ling-Peng

采用B3LYP方法和6-311G(d, p)基组对CH3S及其氧化后继物CH3SO与Oy (y=1, 2, 3)反应形成酸雨的微观机理进行了理论研究. 对反应势能面上的各驻点进行几何构型全优化. 振动分析和IRC计算证实了中间体和过渡态的真实性和相互连接关系. 找到了7条生成SO2的反应途径, 其中CH3S与O直接反应得到产物CH3和SO最容易进行; CH3S先与O3反应, 其产物再与O3反应得到CH3SO2, CH3SO2最后分解得到CH3S和SO2较容易进行, 其它的反应较难进行.

关键词: 酸雨, 密度泛函理论, 反应机理, 电子密度拓扑分析

The reaction mechanism of CH3SOx (x=0, 1) with 3Oy (y=1, 2, 3) has been studied at B3LYP/6-311G (d, p) level. Geometries of the stationary points have been optimized. Vibration analysis and intrinsic reaction coordinate (IRC) calculation at the same level have been applied to validation of the connection of the stationary points. The calculated results show that there are seven channels on the reaction surface of SO2 formation, in which the reaction between CH3S and O would occur the most easily. The channel in which CH3S reacts with O3 first to form CH3SO, then CH3SO reacts with O3 to afford CH3SO2, and finally CH3SO2 decomposes to give CH3S and SO2 could also occur easily. These two channels should be the dominant reaction channels.

Key words: acid rain, density functional theory, reaction mechanism, topological analysis of electronic density