Co-adsorption and mutual interaction of nCO + mH2 on the Fe(1 1 0) and Fe(1 1 1) surfaces

Tao Wang, Xinxin Tian, Yong Yang, Yong Wang Li, Jianguo Wang, Matthias Beller, Haijun Jiao

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Spin-polarized density functional theory computations have been performed to investigate nCO + mH2 co-adsorption and mutual interaction on the Fe(1 1 0) and Fe(1 1 1) surfaces. It is found that CO pre-coverage affects hydrogen adsorption strongly, while H pre-coverage hardly affects CO adsorption. It is possible to have CO + H2 co-adsorption on Fe(1 1 0), while very strong preference of CO pre-coverage on Fe(1 1 1) has been found. On Fe(1 1 1), it is also found that each CO molecule blocks on average 2H adsorption sites at all CO pre-coverage. All these findings are consistent with available experimental results. Compared with CO/H2 ratios in gas phase, CO/H2 surface ratios are very different and much more sensitive to temperature than pressure. Our results provide the basis for exploring the mechanisms of iron-catalyzed conversion of synthesis gas.

Original languageEnglish
Pages (from-to)82-92
Number of pages11
JournalCatalysis Today
Volume261
DOIs
StatePublished - 1 Mar 2016
Externally publishedYes

Keywords

  • Atomistic thermodynamics
  • CO
  • Co-adsorption
  • DFT
  • H
  • Iron surfaces

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