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.
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Fonseca, A.A., Fisher, J.M., Ozkaya, D. et al. Ceria-zirconia supported Au as highly active low temperature Water-gas shift catalysts. Top Catal 44, 223–235 (2007). https://doi.org/10.1007/s11244-007-0295-7
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DOI: https://doi.org/10.1007/s11244-007-0295-7