Preferential oxidation of carbon monoxide in a hydrogen-rich gas stream over supported gold catalysts: the effect of a mixed ceria–zirconia support composition

The effect of the ceria–zirconia (CeO 2 –ZrO 2 ) support composition of a gold (Au) catalyst (Au/Ce 1− x Zr x O 2 , 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 conversio...

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Bibliographic Details
Published in:Research on chemical intermediates 2020-09, Vol.46 (9), p.4173-4192
Main Authors: Chayaporn, Sasiporn, Thunyaratchatanon, Chachchaya, Luengnaruemitchai, Apanee
Format: Article
Language:English
Subjects:
Carbon dioxide
Carbon monoxide
Catalysis
Catalysts
Catalytic activity
Cerium oxides
Chemistry
Chemistry and Materials Science
Composition effects
Crystallites
Fourier transforms
Gas streams
Gold
Inorganic Chemistry
Nanoparticles
Oxidation
Physical Chemistry
Raman spectroscopy
Solid solutions
Stability analysis
Zirconium dioxide
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Summary:The effect of the ceria–zirconia (CeO 2 –ZrO 2 ) support composition of a gold (Au) catalyst (Au/Ce 1− x Zr x O 2 , 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/Ce 0.75 Zr 0.25 O 2 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/CeO 2 –ZrO 2 catalysts. It was found that a certain amount of Ce in the Au/CeO 2 –ZrO 2 catalyst promoted solid solution formation and facilitated the activity of Au 3+ and Au 0 nanoparticles with a small crystallite size. The enhanced catalytic activity of Au/Ce 0.75 Zr 0.25 O 2 was attributed to the presence of more oxygen vacancies, easier reducibility, and appropriate amount of Au 3+ 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).
ISSN:0922-6168
1568-5675
DOI:10.1007/s11164-020-04199-4