Chem. J. Chinese Universities ›› 2018, Vol. 39 ›› Issue (5): 956.doi: 10.7503/cjcu20170723

• Physical Chemistry • Previous Articles     Next Articles

Reaction Mechanism of Criegee Intermediate RCHOO(R=H, CH3) with Nitrogen Dioxide and Formation of HNO3 in the Atmosphere

ZHOU Liting, LEI Xiaoyang, WANG Weina, CHEN Dongping, LIU Fengyi, WANG Wenliang   

  1. Key Laboratory for Macromolecular Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China
  • Received:2017-11-10 Revised:2018-04-20 Online:2018-05-10 Published:2018-04-20
  • Supported by:
    Supported by the National Natural Science Foundation of China(Nos.21473108, 21473107) and the Project of Innovative Team of Key Science and Technology of Shaanxi Province, China(No.2013KCT-17).

Abstract: The mechanism of RCHOO(R=H, CH3)+NO2 reaction was studied at CCSD(T)/aug-cc-pVTZ//M06-2X/cc-pVDZ level. The influence of the methyl substitution on the reactivity was discussed. The results show that the reaction could take place through three channels addition-decomposition, oxidative H-transfer and hydrogen abstraction. Therein, the oxidative H-transfer reaction, which mainly produces the RCO+HNO3, is the favorable pathway. The apparent activation energy and release energy of the oxidative H-transfer reaction are 40.51 and 235.04 kJ/mol, respectively. Moreover, the methyl substituent will lead to the increase of the electropositivity on α-C and decrease of the electronegativity on terminal O, which is advantageous to proceed the addition-decomposition and oxidation-hydrogen transfer reaction. However, the reactivity of the addition-decomposition reaction reduced because of the prominent steric effect in syn-CH3CHOO.

Key words: Criegee intermediate, Nitrogen dioxide, Reaction mechanism, Reaction activity

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