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Oxidation of a Platinum-Tin Alloy Surface during Catalytic CO Oxidation

Wallander, Harald J. LU ; Oropeza, Freddy E. ; Hagman, Benjamin LU ; Knudsen, Jan LU ; Lundgren, Edvin LU and Merte, Lindsay R. LU (2022) In Journal of Physical Chemistry C 126(14). p.6258-6266
Abstract

We have investigated the surface composition of a well-ordered Pt3Sn(111) surface during CO oxidation with ambient pressure X-ray photoemission spectroscopy. Oxidation of tin in the surface coincides with the onset of catalytic conversion, and we observe significant differences in the oxidation state and morphology of the oxide formed depending on the gas composition, with an oxygen-rich mixture leading to formation of 2D wetting layers and a CO-rich mixture leading to formation of 3D oxide islands. Spontaneous oscillations in conversion are observed at 300 °C in the oxygen-rich gas mixture and attributed to the combined effects of site blocking by tin oxides and by CO. The results highlight the importance of gas-surface... (More)

We have investigated the surface composition of a well-ordered Pt3Sn(111) surface during CO oxidation with ambient pressure X-ray photoemission spectroscopy. Oxidation of tin in the surface coincides with the onset of catalytic conversion, and we observe significant differences in the oxidation state and morphology of the oxide formed depending on the gas composition, with an oxygen-rich mixture leading to formation of 2D wetting layers and a CO-rich mixture leading to formation of 3D oxide islands. Spontaneous oscillations in conversion are observed at 300 °C in the oxygen-rich gas mixture and attributed to the combined effects of site blocking by tin oxides and by CO. The results highlight the importance of gas-surface interactions in determining the nature of oxides formed and thus the type and number of interfacial sites under reaction conditions.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry C
volume
126
issue
14
pages
9 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85127899211
ISSN
1932-7447
DOI
10.1021/acs.jpcc.2c00786
language
English
LU publication?
yes
id
5b3fdcb4-09dd-45e5-9d69-3c3aef50bab5
date added to LUP
2022-06-17 14:21:58
date last changed
2023-11-21 09:49:44
@article{5b3fdcb4-09dd-45e5-9d69-3c3aef50bab5,
  abstract     = {{<p>We have investigated the surface composition of a well-ordered Pt<sub>3</sub>Sn(111) surface during CO oxidation with ambient pressure X-ray photoemission spectroscopy. Oxidation of tin in the surface coincides with the onset of catalytic conversion, and we observe significant differences in the oxidation state and morphology of the oxide formed depending on the gas composition, with an oxygen-rich mixture leading to formation of 2D wetting layers and a CO-rich mixture leading to formation of 3D oxide islands. Spontaneous oscillations in conversion are observed at 300 °C in the oxygen-rich gas mixture and attributed to the combined effects of site blocking by tin oxides and by CO. The results highlight the importance of gas-surface interactions in determining the nature of oxides formed and thus the type and number of interfacial sites under reaction conditions.</p>}},
  author       = {{Wallander, Harald J. and Oropeza, Freddy E. and Hagman, Benjamin and Knudsen, Jan and Lundgren, Edvin and Merte, Lindsay R.}},
  issn         = {{1932-7447}},
  language     = {{eng}},
  number       = {{14}},
  pages        = {{6258--6266}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Journal of Physical Chemistry C}},
  title        = {{Oxidation of a Platinum-Tin Alloy Surface during Catalytic CO Oxidation}},
  url          = {{http://dx.doi.org/10.1021/acs.jpcc.2c00786}},
  doi          = {{10.1021/acs.jpcc.2c00786}},
  volume       = {{126}},
  year         = {{2022}},
}