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Structure and reactivity of a model catalyst alloy under realistic conditions

Westerström, Rasmus LU ; Wang, J G; Ackermann, M D; Gustafson, Johan LU ; Resta, Andrea LU ; Mikkelsen, Anders LU ; Andersen, Jesper N LU ; Lundgren, Edvin LU ; Balmes, O and Torrelles, X, et al. (2008) In Journal of Physics: Condensed Matter 20(18). p.6-184018
Abstract
Using a combined experimental and theoretical approach, we show that a thin RhO2 oxide film forms on a Pt25Rh75(100) surface at elevated oxygen pressures and temperatures prior to the bulk oxidation. By the use of in situ surface x-ray diffraction under realistic CO oxidation reaction conditions, we show that the onset of the growth of thin RhO2 oxide film coincides with an increase in CO2 production. During the reaction, the consumed oxide film is continuously re-grown by oxygen in the gas phase. Our theoretical results strongly suggest that the CO adsorbs on the metallic substrate but reacts with the O in the RhO2 oxide film at the border between the RhO2 oxide film and the metallic substrate. This scenario could explain the experimental... (More)
Using a combined experimental and theoretical approach, we show that a thin RhO2 oxide film forms on a Pt25Rh75(100) surface at elevated oxygen pressures and temperatures prior to the bulk oxidation. By the use of in situ surface x-ray diffraction under realistic CO oxidation reaction conditions, we show that the onset of the growth of thin RhO2 oxide film coincides with an increase in CO2 production. During the reaction, the consumed oxide film is continuously re-grown by oxygen in the gas phase. Our theoretical results strongly suggest that the CO adsorbs on the metallic substrate but reacts with the O in the RhO2 oxide film at the border between the RhO2 oxide film and the metallic substrate. This scenario could explain the experimental observations of oxidation reactions on other late transition metal surfaces as well as on their corresponding nanoparticles under realistic conditions. (Less)
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type
Contribution to journal
publication status
published
subject
in
Journal of Physics: Condensed Matter
volume
20
issue
18
pages
6 - 184018
publisher
IOP Publishing
external identifiers
  • wos:000255661200020
  • scopus:42549094511
ISSN
1361-648X
DOI
10.1088/0953-8984/20/18/184018
language
English
LU publication?
yes
id
39a40a14-a3e9-4af4-b771-67472e3d17c9 (old id 1204613)
date added to LUP
2008-09-17 14:41:20
date last changed
2017-02-12 03:44:15
@article{39a40a14-a3e9-4af4-b771-67472e3d17c9,
  abstract     = {Using a combined experimental and theoretical approach, we show that a thin RhO2 oxide film forms on a Pt25Rh75(100) surface at elevated oxygen pressures and temperatures prior to the bulk oxidation. By the use of in situ surface x-ray diffraction under realistic CO oxidation reaction conditions, we show that the onset of the growth of thin RhO2 oxide film coincides with an increase in CO2 production. During the reaction, the consumed oxide film is continuously re-grown by oxygen in the gas phase. Our theoretical results strongly suggest that the CO adsorbs on the metallic substrate but reacts with the O in the RhO2 oxide film at the border between the RhO2 oxide film and the metallic substrate. This scenario could explain the experimental observations of oxidation reactions on other late transition metal surfaces as well as on their corresponding nanoparticles under realistic conditions.},
  author       = {Westerström, Rasmus and Wang, J G and Ackermann, M D and Gustafson, Johan and Resta, Andrea and Mikkelsen, Anders and Andersen, Jesper N and Lundgren, Edvin and Balmes, O and Torrelles, X and Frenken, J W M and Hammer, B},
  issn         = {1361-648X},
  language     = {eng},
  number       = {18},
  pages        = {6--184018},
  publisher    = {IOP Publishing},
  series       = {Journal of Physics: Condensed Matter},
  title        = {Structure and reactivity of a model catalyst alloy under realistic conditions},
  url          = {http://dx.doi.org/10.1088/0953-8984/20/18/184018},
  volume       = {20},
  year         = {2008},
}