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Catalytic effect of (H2O)(n) (n=1-3) clusters on the HO2 + SO2 HOSO + O-3(2) reaction under tropospheric conditions

机译:在对流层病症下HO2 + SO2 HOSO + O-3(2)反应对HO2 + SO2 HOSO + O-3(2)反应的催化作用

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The HO2 + SO2 HOSO + O-3(2) reaction, both without a catalyst and with (H2O)(n) (n = 1-3) as a catalyst, has been investigated using CCSD(T)/CBS//M06-2X/aug-cc-pVTZ methods, and canonical variational transition state theory with small curvature tunneling (CVT/SCT). The calculated results show that H2O exerts the strongest catalytic role in the hydrogen atom transfer processes of HO2 + SO2 HOSO + O-3(2) as compared with (H2O)(2) and (H2O)(3). In the atmosphere at 0 km altitude within the temperature range of 280.0-320.0 K, the reaction with H2O is dominant, compared with the reaction without a catalyst, with an effective rate constant 2-3 orders of magnitude larger. In addition, at 0 km, it is worth mentioning that the relevance of the HO2 + SO2 HOSO + O-3(2) reaction with H2O depends heavily on its ability to compete with the primary loss mechanism of HO2 radicals (such as the HO2 + HO2 and HO2 + NO3 reactions) and SO2 (such as the SO2 + HO reaction). The calculated results show that the HO2 + SO2 HOSO + O-3(2) reaction with H2O cannot be neglected in the primary loss mechanism of the HO2 radical and SO2. The calculated results also show that for the formation of HOSO and O-3(2), the contribution of H2O decreases from 99.98% to 27.27% with an increase in altitude from 0 km to 15 km, due to the lower relative concentration of water. With the altitude increase, the HO2 + SO2 HOSO + O-3(2) reaction with H2O cannot compete with the primary loss mechanism of HO2 radicals. The present results provide new insight into (H2O)(n) (n = 1-3) catalysts, showing that they not only affect energy barriers, but also have an influence on loss mechanisms. The present findings should have broad implications in computational chemistry and atmospheric chemistry.
机译:所述HO2 + SO 2 + HOSO O-3(2)的反应,既没有催化剂,并用(H2O)(N)(N = 1〜3)作为催化剂,一直使用CCSD(T)研究/ CBS // M06 -2X / AUG-CC-pVTZ方法,以及具有小曲率隧道效应(CVT / SCT)正则变分过渡态理论。所计算出的结果表明,H2O施加在的氢原子转移过程最强催化作用HO2 + SO 2 + HOSO O-3(2)与(H 2 O)(2)和(H 2 O)(3)相比,。在温度范围280.0-320.0的K在0公里高度大气中,用H 2 O该反应是显性的,与不使用催化剂的反应相比,具有的有效速率恒定幅度较大的2-3个数量级。此外,在0公里,值得一提的的相关性的HO2 + SO2 HOSO + O-3(2)用H 2 O反应在很大程度上取决于它的竞争能力与HO2自由基(如HO2主损失机制+ HO2和HO2 + NO 3反应)和SO 2(如SO 2 + HO反应)。所计算出的结果表明,用H 2 O + HO2 SO2 HOSO + O-3(2)反应不能在HO2自由基和SO2的主要损失机构被忽略。计算结果还表明,对于HOSO和O-3(2)的形成中,H 2 O的贡献从99.98%减少到27.27%,在高度为15km的增加从0公里由于水的相对较低的浓度。随着海拔高度的增加,用H 2 O + HO2 SO2 HOSO + O-3(2)的反应不能与HO2自由基的主要损失机制竞争。本发明的结果提供了新洞察(H2O)(N)(N = 1-3)的催化剂,显示出它们不仅影响能量势垒,但也对损耗机制的影响。目前的研究结果应该在计算化学和大气化学的广泛影响。

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  • 来源
    《RSC Advances》 |2019年第28期|共13页
  • 作者单位

    Shaanxi Univ Technol Sch Chem &

    Environm Sci Shaanxi Key Lab Catalysis Hanzhong Shaanxi Peoples R China;

    Henan Normal Univ Sch Chem &

    Chem Engn Henan Key Lab Boron Chem &

    Adv Energy Mat Xinxiang 453007 Henan Peoples R China;

    Shaanxi Univ Technol Sch Chem &

    Environm Sci Shaanxi Key Lab Catalysis Hanzhong Shaanxi Peoples R China;

    Shaanxi Univ Technol Sch Chem &

    Environm Sci Shaanxi Key Lab Catalysis Hanzhong Shaanxi Peoples R China;

    Shaanxi Univ Technol Sch Chem &

    Environm Sci Shaanxi Key Lab Catalysis Hanzhong Shaanxi Peoples R China;

    Shaanxi Univ Technol Sch Chem &

    Environm Sci Shaanxi Key Lab Catalysis Hanzhong Shaanxi Peoples R China;

    Shaanxi Univ Technol Sch Chem &

    Environm Sci Shaanxi Key Lab Catalysis Hanzhong Shaanxi Peoples R China;

    Shaanxi Univ Technol Sch Chem &

    Environm Sci Shaanxi Key Lab Catalysis Hanzhong Shaanxi Peoples R China;

    Chinese Acad Sci Inst Earth Environm Key Lab Aerosol Chem &

    Phys Xian Shaanxi Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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