单分子水对H2O2+Cl气相反应影响的理论研究

doi:10.3866/PKU.WHXB201404032

物理化学学报 >> 2014, Vol. 30 >> Issue (6): 1061-1070.doi: 10.3866/PKU.WHXB201404032

单分子水对H₂O₂+Cl气相反应影响的理论研究

许琼¹, 张田雷¹, 吕文彬¹, 王睿¹, 王志银¹, 王文亮², 王竹青³

1 陕西理工学院化学与环境科学学院, 陕西汉中723001;
2 陕西师范大学化学化工学院, 陕西省大分子科学重点实验室, 西安710062;
3 山东省科学院海洋仪器仪表研究所, 山东省海洋环境监测技术重点实验室, 山东青岛266001

收稿日期:2014-01-20 修回日期:2014-03-31 发布日期:2014-05-26
通讯作者: 许琼，王文亮 E-mail:xuq@snut.edu.cn;wlwang@snnu.edu.cn
基金资助:
国家自然科学基金（21173139，21207081），陕西省教育厅科研项目（12JK0625），陕西理工学院科研计划资助项目（SLGQD13（2）-3；SLGQD13（2）-4）和山东省自然科学基金（ZR2012DQ001）资助

Theoretical Study on the effect of a Single Water Molecule on the H₂O₂+Cl Gas Reaction

XU Qiong¹, ZHANG Tian-Lei¹, Lü Wen-Bin¹, WANG Rui¹, WANG Zhi-Yin¹, WANG Wen-Liang², WANG Zhu-Qing³

1 School of Chemical & Environment Science, Shaanxi University of Technology, Hanzhong 723001, Shaanxi Province, P. R. China;
2 Key Laboratory for Macromolecular Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, P. R. China;
3 Shandong Provincial Key Laboratory of Ocean Environment Monitoring Technology, Shandong Academy of Sciences Institute of Oceanographic Instrumentation, Qingdao 266001, Shandong Province, P. R.China

Received:2014-01-20 Revised:2014-03-31 Published:2014-05-26
Contact: XU Qiong, WANG Wen-Liang E-mail:xuq@snut.edu.cn;wlwang@snnu.edu.cn
Supported by:
The project was supported by the National Natural Science Foundation of China (21173139, 21207081), Education Department of Shaanxi Provincial Government Research Project, China (12JK0625), Funds of Research Programs of Shaanxi University of Technology, China (SLGQD13(2)-3, SLGQD13(2)-4), and Natural Science Foundation of Shandong Province, China (ZR2012DQ001).

摘要/Abstract

摘要：

在aug-cc-pVTZ基组下采用CCSD（T）和B3LYP方法，研究了H₂O₂+Cl反应，并考虑在大气中单个水分子对该反应的影响. 结果表明，H₂O₂+Cl反应只存在一条生成产物为HO₂+HCl的通道，其表观活化能为10.21kJ·mol^-1. 加入一分子水后，H₂O₂+Cl反应的产物并没有发生改变，但是所得势能面却比裸反应复杂得多，经历了RW1、RW2和RW3三条通道. 水分子在通道RW1和RW2中对产物生成能垒的降低起显著的负催化作用,而在通道RW3中则起明显的正催化作用. 利用经典过渡态理论（TST）并结合Wigner 矫正模型计算了216.7-298.2 K 温度范围内标题反应的速率常数. 结果显示，298.2 K 时通道R1的速率常数为1.60×10^-13 cm³·molecule^-1·s^-1，与所测实验值非常接近. 此外，尽管通道RW3的速率常数k_RW3比对应裸反应的速率常数k_R1大了46.6-131倍，但该通道的有效速率常数k_RW3'却比k_R1小了10-14个数量级，表明在实际大气环境中水分子对H₂O₂+Cl反应几乎没有影响.

关键词: H₂O₂, Cl, 水催化, 反应机理, 速率常数

Abstract:

The reaction mechanism and rate constant of the H₂O₂+Cl reaction, with and without a single water molecule, was investigated theoretically at the CCSD(T)/aug-cc-pVTZ//B3LYP/aug-cc-pVTZ level of theory. The calculated results show that there is only one channel for the formation of HO₂+HCl in the naked H₂O₂+Cl reaction with an apparent activation energy of 10.21 kJ·mol^-1. When one water molecule is added, the product of the reaction does not change, but the potential energy surface of the reaction becomes complex, yielding three different channels RW1, RW2, and RW3. The single water molecule in the RW1 and RW2 reaction channels has a negative influence on reducing the reaction barrier for the formation of HO₂+HCl, whereas it has a positive influence in Channel RW3. Additionally, to estimate the importance of these processes in the atmosphere, their rate constants were evaluated using conventional transition state theory with the Wigner tunneling correction. The result shows that the rate constant for the naked H₂O₂+Cl reaction is 1.60×10^-13 cm³ ·molecule^-1 ·s^-1 at 298.2 K, which is in good agreement with experimental values. Although the rate constant of channel RW3 is predicted to be 46.6-131 times larger than that of the naked H₂O₂+Cl reaction, its effective rate constant is smaller by 10-14 orders of magnitude than that of the naked reaction, that is, for the H₂O₂ + Cl reaction the naked reaction almost exclusively occurs under tropospheric conditions.

Key words: H₂O₂, Cl, Water-catalyzed, Reaction mechanism, Rate constant

许琼, 张田雷, 吕文彬, 王睿, 王志银, 王文亮, 王竹青. 单分子水对H₂O₂+Cl气相反应影响的理论研究[J]. 物理化学学报, 2014, 30(6), 1061-1070. doi: 10.3866/PKU.WHXB201404032

XU Qiong, ZHANG Tian-Lei, Lü Wen-Bin, WANG Rui, WANG Zhi-Yin, WANG Wen-Liang, WANG Zhu-Qing. Theoretical Study on the effect of a Single Water Molecule on the H₂O₂+Cl Gas Reaction[J]. Acta Phys. -Chim. Sin. 2014, 30(6), 1061-1070. doi: 10.3866/PKU.WHXB201404032

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201404032

https://www.whxb.pku.edu.cn/CN/Y2014/V30/I6/1061

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单分子水对H₂O₂+Cl气相反应影响的理论研究

Theoretical Study on the effect of a Single Water Molecule on the H₂O₂+Cl Gas Reaction

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