A first-principles microkinetic study on the hydrogenation of carbon dioxide over Cu(211) in the presence of water

Xitong Sun, Peng Wang, Zhengjiang Shao, Xiaoming Cao*, P. Hu

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The hydrogenation of carbon dioxide (CO2) is one of important processes to effectively convert and utilize CO2, which is also regarded as the key step at the industrial methanol synthesis. Water is likely to play an important role in this process, but it still remains elusive. To systematically understand its influence, here we computationally compare the reaction mechanisms of CO2 hydrogenation over the stepped Cu(211) surface between in the absence and presence of water based on microkinetic simulations upon density functional theory (DFT) calculations. The effects of water on each hydrogenation step and the whole activity and selectivity are checked and its physical origin is discussed. It is found that the water could kinetically accelerate the hydrogenation on CO2 to COOH, promoting the reverse water gas shift reaction to produce carbon monoxide (CO). It hardly influences the CO2 hydrogenation to methanol kinetically. In addition, the too high initial partial pressure of water will thermodynamically inhibit the CO2 conversion.

Original languageEnglish
Pages (from-to)1686-1697
Number of pages12
JournalScience China Chemistry
Volume62
Issue number12
Early online date14 Nov 2019
DOIs
Publication statusPublished - 01 Dec 2019

Keywords

  • CHOH selectivity
  • CO activation
  • DFT
  • microkinetic modeling

ASJC Scopus subject areas

  • Chemistry(all)

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