6533b7d7fe1ef96bd12690a1
RESEARCH PRODUCT
Structure of the Metal–Support Interface and Oxidation State of Gold Nanoparticles Supported on Ceria
Antonino MartoranaFrancesco GianniciAnna Maria VeneziaAlessandro LongoLeonarda F. LiottaGiuseppe Pantaleosubject
Materials scienceExtended X-ray absorption fine structureOxideXANESSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsCatalysisX-ray absorption fine structureMetalCrystallographychemistry.chemical_compoundGeneral EnergychemistryChemical engineeringColloidal goldOxidation statevisual_artEXAFS ceria catalysis goldvisual_art.visual_art_mediumPhysical and Theoretical Chemistrydescription
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 A. 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 A, 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-01-19 | The Journal of Physical Chemistry C |