Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Study of active surface centers of Pt/CeO2 catalysts prepared using radio-frequency plasma sputtering technique. / Stadnichenko, Andrey I.; Muravev, Valerii V.; Koscheev, Sergey V. и др.
в: Surface Science, Том 679, 01.01.2019, стр. 273-283.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Study of active surface centers of Pt/CeO2 catalysts prepared using radio-frequency plasma sputtering technique
AU - Stadnichenko, Andrey I.
AU - Muravev, Valerii V.
AU - Koscheev, Sergey V.
AU - Zaikovskii, Vladimir I.
AU - Aleksandrov, Hristiyan A.
AU - Neyman, Konstantin M.
AU - Boronin, Andrei I.
PY - 2019/1/1
Y1 - 2019/1/1
N2 - RF-plasma deposition of Pt on a nanosized ceria powder support has been performed directly in photoelectron spectrometer chambers to prepare model catalysts. The plasma deposition in an oxidizing environment results in the formation of highly dispersed oxide nanoparticles up to 2 nm large, which contain platinum solely as Pt4+ ions revealed by Eb(Pf4f7/2) = 74.6 eV. Thus prepared model catalyst samples arranged as (sub-monolayer) films of PtO2 nanoparticles on the surface of CeO2 are characterized by an increased thermal stability compared with PtO2 nanoparticles deposited on more inert supports. These PtO2/CeO2 model catalysts show a high activity in the CO oxidation even at room temperature. A detailed analysis of the O1s spectra obtained during the titration by CO of PtO2/CeO2 films strongly suggests that the reactive oxygen species are manifested with Eb(O1s) = 530.8 eV and 532.9 eV. The latter core level energies are attributed to oxygen in the platinum dioxide and to peroxide-like oxygen, presumably located at the interface between PtO2 and CeO2 particles. Results of our density-functional calculations indicate that the peroxide-like species can be energetically stabilized at the PtOx–CeO2 interfaces.
AB - RF-plasma deposition of Pt on a nanosized ceria powder support has been performed directly in photoelectron spectrometer chambers to prepare model catalysts. The plasma deposition in an oxidizing environment results in the formation of highly dispersed oxide nanoparticles up to 2 nm large, which contain platinum solely as Pt4+ ions revealed by Eb(Pf4f7/2) = 74.6 eV. Thus prepared model catalyst samples arranged as (sub-monolayer) films of PtO2 nanoparticles on the surface of CeO2 are characterized by an increased thermal stability compared with PtO2 nanoparticles deposited on more inert supports. These PtO2/CeO2 model catalysts show a high activity in the CO oxidation even at room temperature. A detailed analysis of the O1s spectra obtained during the titration by CO of PtO2/CeO2 films strongly suggests that the reactive oxygen species are manifested with Eb(O1s) = 530.8 eV and 532.9 eV. The latter core level energies are attributed to oxygen in the platinum dioxide and to peroxide-like oxygen, presumably located at the interface between PtO2 and CeO2 particles. Results of our density-functional calculations indicate that the peroxide-like species can be energetically stabilized at the PtOx–CeO2 interfaces.
KW - Ceria
KW - CO oxidation
KW - DFT calculations
KW - Oxygen species
KW - Platinum
KW - RF-plasma sputtering
KW - XPS
KW - THERMAL-STABILITY
KW - THIN-FILMS
KW - OXIDE
KW - CO OXIDATION
KW - AL2O3 FILMS
KW - REACTION PROBABILITY
KW - RAY PHOTOELECTRON-SPECTROSCOPY
KW - PLATINUM NANOPARTICLES
KW - CERIA
KW - IN-SITU
UR - http://www.scopus.com/inward/record.url?scp=85054784501&partnerID=8YFLogxK
U2 - 10.1016/j.susc.2018.10.002
DO - 10.1016/j.susc.2018.10.002
M3 - Article
AN - SCOPUS:85054784501
VL - 679
SP - 273
EP - 283
JO - Surface Science
JF - Surface Science
SN - 0039-6028
ER -
ID: 17115818