CO methanation on ruthenium flat and stepped surfaces: Key role of H-transfers and entropy revealed by ab initio molecular dynamics

Lucas Foppa, Marcella Iannuzzi, Christophe Copéret, Aleix Comas-Vives

Research output: Contribution to journalArticleResearch

5 Citations (Scopus)

Abstract

© 2019 Elsevier Inc. The methanation reaction converting CO into CH4 at ca. 400 °C is proposed to take place on uncoordinated surface sites (e.g. step-edges) of Ru catalysts because of the higher measured reactivity of stepped vs. flat single crystal metal surfaces. However, the reaction mechanisms occurring at step-edges remain unclear due to the limitations in modelling high temperatures processes by the common evaluation of potential energy surfaces by density functional theory calculations. Here, we show using ab initio molecular dynamics simulations on CO-covered Ru flat and stepped surfaces models at 400 °C that hydrogen-transfers favoured at elevated temperatures are crucial for both CO activation and CHx (x = 1, 2, 3) hydrogenation steps of the methanation reaction, especially at step-edges.
Original languageEnglish
Pages (from-to)270-275
JournalJournal of Catalysis
Volume371
DOIs
Publication statusPublished - 1 Mar 2019

Keywords

  • Ab initio molecular dynamics
  • CO activation
  • Density functional theory
  • Hydrogen transfer
  • Methanation
  • Step-edge sites

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