An Au/CeO2 model catalyst was prepared by deposition–precipitation, with the aim of obtaining a sample suitable for a detailed X-ray absorption fine structure (XAFS) analysis of the gold–ceria interface structure. The results demonstrate the existence of a large interface between the gold particle and the support oxide, characterized by well-defined Au–O and Au–Ce interactions extending up to 6.4 Å. The complex interface structure is retained after CO treatment up to 250 °C and subsequent reoxidation at 400 °C. The analysis of the XANES spectra, and the Au–O distance of 2.21 Å, longer than Au–O bond lengths previously reported for Au/ceria catalysts, suggest a low oxidation state for the gold atoms placed at the interface between Au and ceria.

Longo, A., Liotta, L.F., Pantaleo, G., Giannici, F., Venezia, A.M., Martorana, A. (2012). Structure of the Metal–Support Interface and Oxidation State of Gold Nanoparticles Supported on Ceria. JOURNAL OF PHYSICAL CHEMISTRY. C, 116, 2960-2966 [10.1021/jp209966g].

Structure of the Metal–Support Interface and Oxidation State of Gold Nanoparticles Supported on Ceria

GIANNICI, Francesco;MARTORANA, Antonino
2012-01-01

Abstract

An Au/CeO2 model catalyst was prepared by deposition–precipitation, with the aim of obtaining a sample suitable for a detailed X-ray absorption fine structure (XAFS) analysis of the gold–ceria interface structure. The results demonstrate the existence of a large interface between the gold particle and the support oxide, characterized by well-defined Au–O and Au–Ce interactions extending up to 6.4 Å. The complex interface structure is retained after CO treatment up to 250 °C and subsequent reoxidation at 400 °C. The analysis of the XANES spectra, and the Au–O distance of 2.21 Å, longer than Au–O bond lengths previously reported for Au/ceria catalysts, suggest a low oxidation state for the gold atoms placed at the interface between Au and ceria.
2012
Longo, A., Liotta, L.F., Pantaleo, G., Giannici, F., Venezia, A.M., Martorana, A. (2012). Structure of the Metal–Support Interface and Oxidation State of Gold Nanoparticles Supported on Ceria. JOURNAL OF PHYSICAL CHEMISTRY. C, 116, 2960-2966 [10.1021/jp209966g].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/61764
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