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A Comparative Study on C2 Hydrocarbons and Methanol Synthesis from CO Hydrogenation Catalyzed by M1/W6S8 (M = Ir and Ca) Single-Atom Catalysts

  • Zijun Hao
  • Yu Han
  • Sibei Guo
  • Qian Zhang
  • Ling GuoEmail author
Article
  • 13 Downloads

Abstract

Exploring highly selective catalysts for CO hydrogenation reactions remains a significant challenge as a critical stage in the conversion of CO resources into chemicals or fuels. Here, we provide guidelines on this issue, exploring the generation of major production in the CO hydrogenation process of M1/W6S8 (M = Ir and Ca) single-atom catalysts, and performing density functional calculations. Calculate the reaction energy and barrier for each basic step. Calculations represent that the Ca1/W6S8 catalyst is very advantageous for methanol synthesis (CO* + 4H* → CHO* + 3H* → CH2O* + 3H* → CH3O* + H* → CH3OH*). On the other hand, the Ir1/W6S8 catalyst strongly favors the production of C2 hydrocarbons. We use the harmonic transition state theory to calculate the rate constant of the subsequent step of converting CH3O* species on M1/W6S8 (M = Ir and Ca). The results of the rate constants are consistent with our kinetic results. These results add new insights into the basic understanding of complex CO hydrogenation reactions.

Graphic Abstract

A series of reactions starting from CO on the (a) Ir1/W6S8, (b) Ca1/W6S8. The activation barriers and reaction energies of the elementary steps are all shown in kcal/mol.

Keywords

M1/W6S8 (M = Ir and Ca) single-atom catalysts CO hydrogenation reactions Harmonic transition state theory 

Notes

Acknowledgements

This work was financially supported by the “1331” project of Shanxi Province, High School 131 Leading Talent Project of Shanxi, the Natural Science Foundation of Shanxi, and Undergraduate Training Programs for Innovation and Entrepreneurship of Shanxi Province, Graduate student innovation project of Shanxi Normal University (01053017). Shanxi Graduate Education Innovation Project (2019SY298).

Supplementary material

10562_2019_3007_MOESM1_ESM.docx (296 kb)
Supplementary material 1 (DOCX 295 kb)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Zijun Hao
    • 1
  • Yu Han
    • 1
  • Sibei Guo
    • 2
  • Qian Zhang
    • 1
  • Ling Guo
    • 1
    Email author
  1. 1.Key Laboratory of Magnetic Molecules and Magnetic Information Materials, Ministry of Education, School of Chemistry and Material ScienceShanxi Normal UniversityLinfenChina
  2. 2.The Second Clinical Medical College of Shanxi Medical UniversityTaiyuanChina

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