Gold catalysts supported on nanostructured Ce-Al-O mixed oxides prepared by organic sol-gel

Elena Smolentseva; Andrey Simakov; Sergey Beloshapkin; Miguel Estrada; Eunice Vargas; Vladimir Sobolev; Roman Kenzhin; Sergio Fuentes

doi:10.1016/j.apcatb.2011.12.010

Gold catalysts supported on nanostructured Ce-Al-O mixed oxides prepared by organic sol-gel

Elena Smolentseva, Andrey Simakov, Sergey Beloshapkin, Miguel Estrada, Eunice Vargas, Vladimir Sobolev, Roman Kenzhin, Sergio Fuentes

Research output: Contribution to journal › Article › peer-review

Abstract

Nanostructured ceria-alumina mixed oxides containing different concentrations of ceria (10 and 30wt.%) were prepared by the sol-gel method using organo-metallic precursors of alumina and ceria. The size of alumina and ceria particles in the prepared Ce-Al-O mixed oxides was smaller than that of pure alumina or ceria. The gold catalysts (3wt.% Au) supported on ceria-alumina mixed oxides by deposition-precipitation (DP) using HAuCl ₄ and urea were characterized by several techniques: TEM, XPS and UV-vis spectroscopy, and temperature programmed reduction/oxidation (TPR/TPO). The catalytic activity of prepared Au/CeO ₂-Al ₂O ₃ catalysts in CO oxidation was higher than that of Au/Al ₂O ₃ and Au/CeO ₂ catalysts. Nanostructured ceria incorporated into an alumina matrix has been found quite effective for gold species activation in CO oxidation. In fact, transient analysis of CO oxidation provided an estimate of the relative content of (Au-ceria vacancy) active sites in catalysts. Obtained values are in good agreement with the order of activity for tested samples and gold dispersion according to EXAFS data.

Original language	English
Pages (from-to)	117-128
Number of pages	12
Journal	Applied Catalysis B: Environmental
Volume	115-116
DOIs	https://doi.org/10.1016/j.apcatb.2011.12.010
Publication status	Published - 5 Apr 2012

Keywords

Ceria-alumina
Gold
Mixed oxides
Nanoparticles
Sol-gel
Transient analysis

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10.1016/j.apcatb.2011.12.010

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title = "Gold catalysts supported on nanostructured Ce-Al-O mixed oxides prepared by organic sol-gel",

abstract = "Nanostructured ceria-alumina mixed oxides containing different concentrations of ceria (10 and 30wt.%) were prepared by the sol-gel method using organo-metallic precursors of alumina and ceria. The size of alumina and ceria particles in the prepared Ce-Al-O mixed oxides was smaller than that of pure alumina or ceria. The gold catalysts (3wt.% Au) supported on ceria-alumina mixed oxides by deposition-precipitation (DP) using HAuCl 4 and urea were characterized by several techniques: TEM, XPS and UV-vis spectroscopy, and temperature programmed reduction/oxidation (TPR/TPO). The catalytic activity of prepared Au/CeO 2-Al 2O 3 catalysts in CO oxidation was higher than that of Au/Al 2O 3 and Au/CeO 2 catalysts. Nanostructured ceria incorporated into an alumina matrix has been found quite effective for gold species activation in CO oxidation. In fact, transient analysis of CO oxidation provided an estimate of the relative content of (Au-ceria vacancy) active sites in catalysts. Obtained values are in good agreement with the order of activity for tested samples and gold dispersion according to EXAFS data.",

keywords = "Ceria-alumina, Gold, Mixed oxides, Nanoparticles, Sol-gel, Transient analysis",

author = "Elena Smolentseva and Andrey Simakov and Sergey Beloshapkin and Miguel Estrada and Eunice Vargas and Vladimir Sobolev and Roman Kenzhin and Sergio Fuentes",

year = "2012",

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doi = "10.1016/j.apcatb.2011.12.010",

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T1 - Gold catalysts supported on nanostructured Ce-Al-O mixed oxides prepared by organic sol-gel

AU - Smolentseva, Elena

AU - Simakov, Andrey

AU - Beloshapkin, Sergey

AU - Estrada, Miguel

AU - Vargas, Eunice

AU - Sobolev, Vladimir

AU - Kenzhin, Roman

AU - Fuentes, Sergio

PY - 2012/4/5

Y1 - 2012/4/5

N2 - Nanostructured ceria-alumina mixed oxides containing different concentrations of ceria (10 and 30wt.%) were prepared by the sol-gel method using organo-metallic precursors of alumina and ceria. The size of alumina and ceria particles in the prepared Ce-Al-O mixed oxides was smaller than that of pure alumina or ceria. The gold catalysts (3wt.% Au) supported on ceria-alumina mixed oxides by deposition-precipitation (DP) using HAuCl 4 and urea were characterized by several techniques: TEM, XPS and UV-vis spectroscopy, and temperature programmed reduction/oxidation (TPR/TPO). The catalytic activity of prepared Au/CeO 2-Al 2O 3 catalysts in CO oxidation was higher than that of Au/Al 2O 3 and Au/CeO 2 catalysts. Nanostructured ceria incorporated into an alumina matrix has been found quite effective for gold species activation in CO oxidation. In fact, transient analysis of CO oxidation provided an estimate of the relative content of (Au-ceria vacancy) active sites in catalysts. Obtained values are in good agreement with the order of activity for tested samples and gold dispersion according to EXAFS data.

AB - Nanostructured ceria-alumina mixed oxides containing different concentrations of ceria (10 and 30wt.%) were prepared by the sol-gel method using organo-metallic precursors of alumina and ceria. The size of alumina and ceria particles in the prepared Ce-Al-O mixed oxides was smaller than that of pure alumina or ceria. The gold catalysts (3wt.% Au) supported on ceria-alumina mixed oxides by deposition-precipitation (DP) using HAuCl 4 and urea were characterized by several techniques: TEM, XPS and UV-vis spectroscopy, and temperature programmed reduction/oxidation (TPR/TPO). The catalytic activity of prepared Au/CeO 2-Al 2O 3 catalysts in CO oxidation was higher than that of Au/Al 2O 3 and Au/CeO 2 catalysts. Nanostructured ceria incorporated into an alumina matrix has been found quite effective for gold species activation in CO oxidation. In fact, transient analysis of CO oxidation provided an estimate of the relative content of (Au-ceria vacancy) active sites in catalysts. Obtained values are in good agreement with the order of activity for tested samples and gold dispersion according to EXAFS data.

KW - Ceria-alumina

KW - Gold

KW - Mixed oxides

KW - Nanoparticles

KW - Sol-gel

KW - Transient analysis

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DO - 10.1016/j.apcatb.2011.12.010

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JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

ER -

Gold catalysts supported on nanostructured Ce-Al-O mixed oxides prepared by organic sol-gel

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Keywords

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