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In Situ X-Ray Photoelectron Spectroscopy of Model Catalysts: At the Edge of the Gap

Blomberg, Sara LU ; Hoffmann, M. J. ; Gustafson, Johan LU ; Martin, Natalia LU ; Fernandes, V. R. ; Borg, A. ; Liu, Z. ; Chang, R. ; Matera, S. and Reuter, K. , et al. (2013) In Physical Review Letters 110(11).
Abstract
We present high-pressure x-ray photoelectron spectroscopy (HP-XPS) and first-principles kinetic Monte Carlo study addressing the nature of the active surface in CO oxidation over Pd(100). Simultaneously measuring the chemical composition at the surface and in the near-surface gas phase, we reveal both O-covered pristine Pd(100) and a surface oxide as stable, highly active phases in the near-ambient regime accessible to HP-XPS. Surprisingly, no adsorbed CO can be detected during high CO2 production rates, which can be explained by a combination of a remarkably short residence time of the CO molecule on the surface and mass-transfer limitations in the present setup. DOI: 10.1103/PhysRevLett.110.117601
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Physical Review Letters
volume
110
issue
11
article number
117601
publisher
American Physical Society
external identifiers
  • wos:000316172500029
  • scopus:84874973843
  • pmid:25166577
ISSN
1079-7114
DOI
10.1103/PhysRevLett.110.117601
language
English
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361dc41a-87e1-409c-8365-f6d074c7446d (old id 3765096)
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2016-04-01 10:42:18
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@article{361dc41a-87e1-409c-8365-f6d074c7446d,
  abstract     = {We present high-pressure x-ray photoelectron spectroscopy (HP-XPS) and first-principles kinetic Monte Carlo study addressing the nature of the active surface in CO oxidation over Pd(100). Simultaneously measuring the chemical composition at the surface and in the near-surface gas phase, we reveal both O-covered pristine Pd(100) and a surface oxide as stable, highly active phases in the near-ambient regime accessible to HP-XPS. Surprisingly, no adsorbed CO can be detected during high CO2 production rates, which can be explained by a combination of a remarkably short residence time of the CO molecule on the surface and mass-transfer limitations in the present setup. DOI: 10.1103/PhysRevLett.110.117601},
  author       = {Blomberg, Sara and Hoffmann, M. J. and Gustafson, Johan and Martin, Natalia and Fernandes, V. R. and Borg, A. and Liu, Z. and Chang, R. and Matera, S. and Reuter, K. and Lundgren, Edvin},
  issn         = {1079-7114},
  language     = {eng},
  number       = {11},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {In Situ X-Ray Photoelectron Spectroscopy of Model Catalysts: At the Edge of the Gap},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.110.117601},
  doi          = {10.1103/PhysRevLett.110.117601},
  volume       = {110},
  year         = {2013},
}