Chem. J. Chinese Universities ›› 2017, Vol. 38 ›› Issue (3): 429.doi: 10.7503/cjcu20160775

• Physical Chemistry • Previous Articles     Next Articles

Catalytic Effect of n(H2O)(n=1,2) on the Reaction of HO2+NOHNO3

WANG Rui1, LI Yili1, FENG Xukai1, SONG Liang1, ZHANG Tianlei1,*(), WANG Zhuqing2, JIN Lingxia1, ZHANG Qiang1, XU Qiong1, WANG Zhiyin1   

  1. 1. Shaanxi Key Laboratory of Catalysis, School of Chemical and Environment Science, Shaanxi University of Technology, Hanzhong 723001, China;
    2. Analytical and Testing Center, Sichuan University of Science & Engineering, Zigong 643000, China;
  • Received:2016-11-08 Online:2017-03-10 Published:2017-02-23
  • Contact: ZHANG Tianlei E-mail:ztianlei88@163.com
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos.21603132, 21502109), the Project of Education Department of Shaanxi Province, China(No.15JK1138) and the Funds of Research Programs of Shaanxi Sci-Tech University, China[Nos.SLGQD13(2)-3, SLGQD13(2)-4].

Abstract:

The mechanism and rate constant for the HO2+NOHNO3 reaction, without and with n(H2O)(n=1,2) was investigated at the CCSD(T)/aug-cc-pVTZ//B3LYP/6-311+G(2df,2p) level. The results show that, incorporation of the catalyst[n(H2O)(n=1,2)] into the reaction of HO2+NOHNO3, the reactions between NO radical and HO2…(H2O)n(n=1,2) complexes are more favorable than the corresponding reactions of HO2 radical with NO…(H2O)n(n=1,2) complexes, as well as the reactions of HO2…H2O+NO…H2O, H2O…HO2+NO…H2O and H2O…HO2+ON…H2O due to the lower barrier of the former reactions and the larger rate constant of the reaction between HO2…(H2O)n(n=1,2) complexes and NO. Meanwhile, the catalytic effect of n(H2O)(n=1,2) is mainly taken from the contribution of a single water vapor, due to the effective rate constant of H2O…HO2+NO reaction was larger by 10—12 orders of magnitude than that of NO+HO2…(H2O)2 reaction. Compared with the reaction of HO2+NOHNO3 without water molecule, the single water molecule in H2O…HO2+NO reaction has a positive influence on enhancing the rate of HNO3 formation, and the catalytic effect increase with the temperature increase. At 298.2 K, water vapor shows the most significant catalytic effect with the value of k'RW1/ktotal up to 67.93%, indicating that the single water molecule in H2O…HO2+NO channel shows a positive catalytic effect on enhancing the rate of HNO3 formation under atmospheric conditions.

Key words: HO2, NO, Water-catalyzed, Reaction mechanism, Rate constant

CLC Number: 

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