• Author: Rasmussen, Dominik Bjørn

    Haldor Topsoe A/S, Denmark

  • Author: Janssens, Ton V.W.

    Haldor Topsoe A/S, Denmark

  • Author: Temel, Burcin

    Haldor Topsoe A/S, Denmark

  • Author: Bligaard, Thomas

    Department of Physics, Technical University of Denmark

  • Author: Hinnemann, Berit

    Haldor Topsoe A/S, Denmark

  • Author: Helveg, Stig

    Haldor Topsoe A/S, Denmark

  • Author: Sehested, Jens

    Haldor Topsoe A/S, Denmark

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Catalysts based on copper, such as the Cu/ZnO/Al2O3 system are widely used for industrial scale methanol synthesis and the low temperature water gas shift reaction. A common characteristic of these catalysts is that they deactivate quite rapidly during operation and therefore understanding their deactivation by sintering is highly relevant. In this work, we study the nature of the species that are responsible for transport of the Cu metal in this catalyst type using density functional theory calculations within a chemical potential formalism. The stability and mobility of Cu–X (Cu, OH, CO, CH3O, HCOO) species are investigated in relevant synthesis gas compositions. The CuCO and Cu2HCOO species are identified to be predominant for metal transport on Cu particles, which may contribute to sintering of Cu by particle migration and coalescence. Furthermore, transport of Cu on ZnO is found mostly to occur through CuCO species, which indicates that CuCO is an important species for Ostwald ripening in a Cu/ZnO catalyst. These results provide atomistic perspective on the diffusion of the species that may contribute to catalyst sintering, therefore lending a valuable foundation for future investigations of the stability of Cu catalysts.

Original languageEnglish
JournalJournal of Catalysis
Publication date2012
Volume293
Pages205-214
ISSN0021-9517
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 6

Keywords

  • Methanol synthesis, Water–gas shift, Cu/ZnO catalysts, Sintering, Adsorbate–metal complex, Density functional theory calculations, Coalescence, Ostwald ripening
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