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Theoretical Study of the Water–Gas Shift Reaction on a Au/Hematite Model Catalyst

  • Silvia A. FuenteEmail author
  • Carolina Zubieta
  • Ricardo M. Ferullo
  • Patricia G. Belelli
Original Paper
  • 25 Downloads

Abstract

Using the density functional theory, the mechanism of the water–gas shift reaction has been investigated employing a model catalyst formed by a Au5 cluster supported on the Fe-terminated (0001) face of hematite (α-Fe2O3), to better understand the role played by the metal–oxide interface in this reaction. Our results indicate that the Au5/hematite model catalyst has a good performance to catalyze the reaction following the so-called adsorptive mechanism. The presence of Au favors the development of the reaction due mainly to the following factors: (i) H2O dissociates very easily at the metal–oxide interface producing OH species; (ii) CO adsorbs strongly on a Au site nearby the position of OH; (iii) the hydroxycarbonyl intermediate (HOCO) is formed at the interface from CO and OH with a low activation barrier; and (iv) after hydrogen releasing, CO2 is desorbed with relative facility from the interface region. The formation of H2 is the stage of the whole reaction that more energy demands; however, this process is favored if one hydrogen atom comes directly from HOCO, instead of from two hydrogen atoms bound to surface oxygen anions.

Keywords

Hematite Gold DFT Model catalysts WGSR 

Notes

Acknowledgements

Authors thank Universidad Nacional del Sur (UNS), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), and Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT) of Argentina for financial support.

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Authors and Affiliations

  1. 1.IFISUR, Universidad Nacional del Sur (UNS-CONICET)Bahía BlancaArgentina
  2. 2.INQUISUR, Departamento de QuímicaUniversidad Nacional del Sur (UNS)-CONICETBahía BlancaArgentina

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