Chem. J. Chinese Universities ›› 2019, Vol. 40 ›› Issue (9): 1911.doi: 10.7503/cjcu20190292

• Physical Chemistry • Previous Articles     Next Articles

Theoretical Study on Mechanism of CO2 Hydrogenation to Formic Acid Catalyzed by Manganese Complex

ZHANG Lin,ZHANG Wei,YUE Xin,LI Pengjie,YANG Zuoyin,PU Min,LEI Ming()   

  1. State Key Laboratory of Chemical Resource Engineering, College of Chemistry,Institute of Computational Chemistry, Beijing University of Chemical Technology, Beijing 100029, China
  • Received:2019-05-22 Online:2019-09-10 Published:2019-09-09
  • Contact: LEI Ming E-mail:leim@mail.buc
  • Supported by:
    ? Supported by the National Natural Science Foundation of China(21672018);the Fundamental Research Funds for the Central Universities, China(XK1802-6)

Abstract:

Density functional theory(DFT) was used to study the mechanism of carbon dioxide hydrogenation to formic acid catalyzed by manganese complex. The whole catalytic cycle mainly includes two stages of hydrogen activation and carbon dioxide hydrogenation. The calculation results show that the participation of formic acid significantly reduces the reaction energy barrier of hydrogen activation. The hydrogenation process of carbon dioxide follows the outer-sphere mechanism and hydrogen transfer is a stepwise process, in which the hydride transfer is the rate-determining step, with an energy barrier of 21.0 kJ/mol. In addition, the modulation effect of R group on S atom was explored. The results show that when R is an electron-withdrawing group, it can reduce the activation barriers of hydrogen cracking and proton transfer during carbon dioxide hydrogenation. The transfer of hydride is facilitated when the R group is an electron-donating group. When R=CF3, the energy span of the whole reaction is the smallest, which is 80.4 kJ/mol.

Key words: Manganese complex, Hydrogen activation, Carbon dioxide hydrogenation, Reaction mechanism, Density functional theory

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