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Platinum-Tin Surface Alloys Studied during O2 Exposure and CO Oxidation Using Grazing Incidence XANES

Wallander, Harald J. LU ; Gajdek, Dorotea LU ; Harlow, Gary S. LU ; Blomqvist, Jakob ; Just, Justus LU orcid ; Ciambezi, Matteo LU ; Lundgren, Edvin LU and Merte, Lindsay R. LU (2024) In Journal of Physical Chemistry C 128(50). p.21368-21376
Abstract

Platinum-tin catalysts have been used industrially for decades, but their structural evolution under reaction conditions and the causes of their improved activity relative to platinum are still not well understood. In this study, we investigate Sn/Pt(111) and Sn/Pt(223) surface alloys during oxygen exposure and catalytic CO oxidation using grazing incidence X-ray absorption spectroscopy (GI-XAS). The spectra were collected in fluorescence mode, and the XANES region was used for analysis. In O2, the Sn/Pt surface alloys segregate, and tin oxide similar to SnO2 forms. In CO and O2, Sn(II) oxide forms on the Sn/Pt surfaces. The spectra from the Sn(II) oxide qualitatively agree with the simulated spectra of... (More)

Platinum-tin catalysts have been used industrially for decades, but their structural evolution under reaction conditions and the causes of their improved activity relative to platinum are still not well understood. In this study, we investigate Sn/Pt(111) and Sn/Pt(223) surface alloys during oxygen exposure and catalytic CO oxidation using grazing incidence X-ray absorption spectroscopy (GI-XAS). The spectra were collected in fluorescence mode, and the XANES region was used for analysis. In O2, the Sn/Pt surface alloys segregate, and tin oxide similar to SnO2 forms. In CO and O2, Sn(II) oxide forms on the Sn/Pt surfaces. The spectra from the Sn(II) oxide qualitatively agree with the simulated spectra of previously studied surface oxides but not with SnO. The study provides insights into the behavior of well-defined Sn/Pt surfaces under realistic conditions and connects ambient-pressure catalysis with previous surface science research.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry C
volume
128
issue
50
pages
9 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85211591549
ISSN
1932-7447
DOI
10.1021/acs.jpcc.4c05582
language
English
LU publication?
yes
id
f869241c-6840-47be-ad57-c71d3330822e
date added to LUP
2025-01-16 13:14:35
date last changed
2025-04-04 14:36:27
@article{f869241c-6840-47be-ad57-c71d3330822e,
  abstract     = {{<p>Platinum-tin catalysts have been used industrially for decades, but their structural evolution under reaction conditions and the causes of their improved activity relative to platinum are still not well understood. In this study, we investigate Sn/Pt(111) and Sn/Pt(223) surface alloys during oxygen exposure and catalytic CO oxidation using grazing incidence X-ray absorption spectroscopy (GI-XAS). The spectra were collected in fluorescence mode, and the XANES region was used for analysis. In O<sub>2</sub>, the Sn/Pt surface alloys segregate, and tin oxide similar to SnO<sub>2</sub> forms. In CO and O<sub>2</sub>, Sn(II) oxide forms on the Sn/Pt surfaces. The spectra from the Sn(II) oxide qualitatively agree with the simulated spectra of previously studied surface oxides but not with SnO. The study provides insights into the behavior of well-defined Sn/Pt surfaces under realistic conditions and connects ambient-pressure catalysis with previous surface science research.</p>}},
  author       = {{Wallander, Harald J. and Gajdek, Dorotea and Harlow, Gary S. and Blomqvist, Jakob and Just, Justus and Ciambezi, Matteo and Lundgren, Edvin and Merte, Lindsay R.}},
  issn         = {{1932-7447}},
  language     = {{eng}},
  number       = {{50}},
  pages        = {{21368--21376}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Journal of Physical Chemistry C}},
  title        = {{Platinum-Tin Surface Alloys Studied during O<sub>2</sub> Exposure and CO Oxidation Using Grazing Incidence XANES}},
  url          = {{http://dx.doi.org/10.1021/acs.jpcc.4c05582}},
  doi          = {{10.1021/acs.jpcc.4c05582}},
  volume       = {{128}},
  year         = {{2024}},
}