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The activity and thermal stability of RhO x /CeO 2 nanocomposites prepared by radio‐frequency plasma sputtering
Author(s) -
Kibis Lidiya S.,
Krotova Alena I.,
Zaikovskii Vladimir I.,
Boronin Andrei I.
Publication year - 2020
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.6879
Subject(s) - sputtering , x ray photoelectron spectroscopy , thermal stability , analytical chemistry (journal) , materials science , oxide , rhodium , plasma , chemistry , chemical engineering , catalysis , nanotechnology , thin film , metallurgy , physics , engineering , biochemistry , organic chemistry , chromatography , quantum mechanics
The model RhO x /CeO 2 systems were prepared by radio‐frequency (RF) plasma sputtering of Rh electrode in O 2 or Ar/O 2 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 CeO 2 surface (RhO x /CeO 2 ) obtained by RF sputtering in O 2 have spectroscopic characteristics close to those of Rh 3+ ions highly dispersed in ceria lattice. The RhO x /CeO 2 system remains stable upon heating in vacuum at 450°C and shows reactivity towards CO oxidation at T > 200°C. RF sputtering in Ar/O 2 atmosphere results in the formation of larger rhodium nanoparticles that are close to Rh 2 O 3 oxide. The Rh 2 O 3 /CeO 2 system demonstrates lower activity in CO oxidation and cannot be reduced at a temperature below 300°C.
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