Acta Chimica Sinica ›› 2011, Vol. 69 ›› Issue (17): 1957-1964.     Next Articles

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过氧氢自由基HO2与CH2S的反应机理及动力学

刘占荣1,2,许保恩1,2,曾艳丽1,李晓艳1,孟令鹏*,1,孙政1,张雪英1,张萍2   

  1. (1河北师范大学计算量子化学研究所 石家庄 050016)
    (2石家庄学院化工学院 石家庄 050035)
  • 投稿日期:2010-12-23 修回日期:2011-04-12 发布日期:2011-05-11
  • 通讯作者: 孟令鹏 E-mail:menglp@mail.hebtu.edu.cn
  • 基金资助:

    AIM和ELF理论方法及应用的新拓展;取代元素对镁基储氢合金结构和性质影响的理论研究;电子密度拓扑分析理论方法研究弱键结构;金属氢化物储氢材料的结构、成键作用及稳定性的理论研究;用电子密度拓扑分析理论研究有机金属簇合物中的化学键;大气化学中光化学氧化剂的反应活性研究;镁基储氢合金结构、性质及储氢机制的理论研究

Reaction Mechanisms and Kinetics for the Reaction of HO2+CH2S

Liu Zhanrong1,2 Xu Baoen1,2 Zeng Yanli1 Li Xiaoyan1 Meng Lingpeng*,1 Sun Zheng1 Zhang Xueying1 Zhang Ping2   

  1. (1 Institute of Quantum Chemistry, Hebei Normal University, Shijiazhuang 050016)
    (2 College of Chemical Engineering, Shijiazhuang University, Shijiazhuang 050035)
  • Received:2010-12-23 Revised:2011-04-12 Published:2011-05-11

The reaction mechanism of HO2 with CH2S was investigated at the B3LYP/6-311++G(d,p) level. Energetic information of stationary points and the points along the minimum energy path is further refined at the CCSD(T)/6-311++G(d,p) level. The rate constants of these channels in the temperature range of 200~2500 K were evaluated by means of the classical transition state theory (TST) and the canonical variational transition state theory (CVT) conjunction with the small-curvature tunneling correction (SCT). Six possible reaction channels have been identified for the title reaction. Based on the potential energy surface and the kinetics, it can be concluded that HOOCH2S, formed via the end O atom of the HO2 radical attacking on the C atom of the CH2S molecule, and its isomer OOCH2SH are the major products. When the temperature is lower than 1400 K, the channel (1a) HO2+CH2S→TS1/P1→HOOCH2S is the major reaction path, while the channel (2a) HO2+CH2S→TS2/P1→HOOCH2S becomes the favorable reaction path when the temperature is higher than 1400 K.

Key words: HO2, CH2S, reaction mechanism, rate constant

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