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

Antonino Martorana, Francesco Giannici, Anna Maria Venezia, Antonino Martorana, Alessandro Longo, Giuseppe Pantaleo, Leonarda F. Liotta

Risultato della ricerca: Articlepeer review

35 Citazioni (Scopus)

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.
Lingua originaleEnglish
pagine (da-a)2960-2966
Numero di pagine7
RivistaJOURNAL OF PHYSICAL CHEMISTRY. C
Volume116
Stato di pubblicazionePublished - 2012

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • ???subjectarea.asjc.2100.2100???
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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