Topics in Catalysis

, Volume 44, Issue 1–2, pp 223–235

Ceria-zirconia supported Au as highly active low temperature Water-gas shift catalysts

  • A. Amieiro Fonseca
  • J. M. Fisher
  • D. Ozkaya
  • M. D. Shannon
  • D. Thompsett
Article

Au/CeZrO4 catalysts have shown very low temperature activity for the WGS reaction. Characterisation of the as-prepared catalysts shows Au is present primarily as isolated Au3+ atoms. It has been found that a higher proportion of Au3+ present in the as-prepared catalyst leads to a higher WGS activity, although under reaction conditions reduction to Au0 is observed. Use of TPR and iso-thermal H2O re-oxidation has shown that Au reacts with H2O at lower temperatures than an equivalent Pt/CeZrO4 catalyst, indicating that H2O activation is key in the onset of low temperature WGS activity.

Keywords

Water-gas shift Au cerium–zirconium mixed oxides TEM XPS TPR Mechanism 

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • A. Amieiro Fonseca
    • 1
  • J. M. Fisher
    • 1
  • D. Ozkaya
    • 1
  • M. D. Shannon
    • 2
    • 3
  • D. Thompsett
    • 1
  1. 1.Johnson Matthey Technology CentreReadingUK
  2. 2.ICI Measurement Science Group, Wilton CentreRedcarUK
  3. 3.UK SuperSTEM Facility, CLRC Daresbury LaboratoriesLeckwick LaneUK

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