Abstract
The effect of the ceria–zirconia (CeO2–ZrO2) support composition of a gold (Au) catalyst (Au/Ce1−xZrxO2, where x is the molar ratio), prepared by deposition–precipitation, on its catalytic activity was investigated in the preferential carbon monoxide (CO) oxidation. A maximum CO conversion level of 94% was obtained with 1% by weight Au/Ce0.75Zr0.25O2 at 50 °C, while the presence of water and carbon dioxide in the feed stream had only a slight effect on the catalytic activity. Catalyst characterizations were performed to investigate the effect of the Ce:Zr molar ratios on the redox properties and physicochemical properties of the obtained Au/CeO2–ZrO2 catalysts. It was found that a certain amount of Ce in the Au/CeO2–ZrO2 catalyst promoted solid solution formation and facilitated the activity of Au3+ and Au0 nanoparticles with a small crystallite size. The enhanced catalytic activity of Au/Ce0.75Zr0.25O2 was attributed to the presence of more oxygen vacancies, easier reducibility, and appropriate amount of Au3+ species, as confirmed by Fourier transform Raman spectroscopy and hydrogen-temperature-programme reduction analyses, respectively. The catalytic activity showed a high stability for a long period of time (28 h).
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