Abstract

The model RhOx/CeO2 systems were prepared by radio-frequency (RF) plasma sputtering of Rh electrode in O2 or Ar/O2 atmosphere. Thermal stability of the systems and their reaction probability towards CO oxidation were studied by X-ray photoelectron spectroscopy. It was shown that the small oxidized Rh nanoparticles on the CeO2 surface (RhOx/CeO2) obtained by RF sputtering in O2 have spectroscopic characteristics close to those of Rh3+ ions highly dispersed in ceria lattice. The RhOx/CeO2 system remains stable upon heating in vacuum at 450°C and shows reactivity towards CO oxidation at T > 200°C. RF sputtering in Ar/O2 atmosphere results in the formation of larger rhodium nanoparticles that are close to Rh2O3 oxide. The Rh2O3/CeO2 system demonstrates lower activity in CO oxidation and cannot be reduced at a temperature below 300°C.

Original languageEnglish
Pages (from-to)818-822
Number of pages5
JournalSurface and Interface Analysis
Volume52
Issue number12
DOIs
Publication statusPublished - Dec 2020

Keywords

  • ceria
  • RF plasma sputtering
  • rhodium
  • Rh–CeO interaction
  • XPS
  • NO
  • RHODIUM
  • CO
  • Rh-CeO(2)interaction
  • SUPPORT
  • REDUCTION
  • CATALYTIC-PROPERTIES
  • REACTION PROBABILITY

Fingerprint Dive into the research topics of 'The activity and thermal stability of RhO<sub>x</sub>/CeO<sub>2</sub> nanocomposites prepared by radio-frequency plasma sputtering'. Together they form a unique fingerprint.

Cite this