Chem. J. Chinese Universities ›› 2017, Vol. 38 ›› Issue (8): 1390.doi: 10.7503/cjcu20170162

• Physical Chemistry • Previous Articles     Next Articles

Ab initio Calculation and Kinetic Investigation of Monacid-catalyzed Decomposition of Sulfurous Acid

FANG Sheng1, LIU Jingjing1, DUAN Xuemei1, TAO Fuming2, LIU Jingyao1   

  1. 1. Laboratory of Theoretical and Computational, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, China;
    2. Department of Chemistry and Biochemistry, Fullerton, California State University, California 92834, USA
  • Received:2017-03-20 Revised:2017-07-14 Online:2017-08-10 Published:2017-07-14
  • Supported by:

    Supported by the National Natural Science Foundation of China(No. 21373098).

Abstract:

The mechanism of decomposition of sulfurous acid to sulfur dioxide and water catalyzed by formic acid, acetic acid, propionic acid and nitric acid, respectively, was investigated by ab initio calculations at the CCSD(T)/aug-cc-pVDZ//MP2/aug-cc-pVDZ level of theory herein. The computational results showed that all the four acids presented catalytic effect for the decomposition of sulfurous acid. The reduction extent of the energy barrier was in the order propionic acid > acetic acid > formic acid > nitric acid. Furthermore, the energy barrier of propionic acid-catalyzed reaction decreased dramatically from 99.84 kJ/mol of naked reaction to 27.24 kJ/mol. The rate constants of the catalyzed reactions in the temperature range of 200-320 K had been calculated. In addition, the effective rate constants were also calculated in combination with the atmospheric concentrations of these acids. The results indicated that the acetic acid had the most effective catalytic effect in the atmospheric environment, and the lifetime of sulfurous acid was only 0.02 s with the appearance of acetic acid.

Key words: Sulfurous acid, Monacid, Catalysis, Ab initio calculation, Rate constant

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