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Step dynamics and oxide formation during CO oxidation over a vicinal Pd surface.

Shipilin, Mikhail LU ; Gustafson, Johan LU ; Zhang, Chu LU ; Merte, Lindsay LU and Lundgren, Edvin LU (2016) In Physical chemistry chemical physics : PCCP 18(30). p.20312-20320
Abstract
In an attempt to bridge the material and pressure gaps - two major challenges for an atomic scale understanding of heterogeneous catalysis - we employed high-energy surface X-ray diffraction as a tool to study the Pd(553) surface in situ under changing reaction conditions during CO oxidation. The diffraction patterns recorded under CO rich reaction conditions are characteristic for the metallic state of the surface. In an environment with low excess of O2 over the reaction stoichiometry, the surface seems to accommodate oxygen atoms along the steps forming one or several subsequent adsorbate structures and rapidly transforms into a combination of (332), (111) and (331) facets likely providing the room for the formation of a surface oxide.... (More)
In an attempt to bridge the material and pressure gaps - two major challenges for an atomic scale understanding of heterogeneous catalysis - we employed high-energy surface X-ray diffraction as a tool to study the Pd(553) surface in situ under changing reaction conditions during CO oxidation. The diffraction patterns recorded under CO rich reaction conditions are characteristic for the metallic state of the surface. In an environment with low excess of O2 over the reaction stoichiometry, the surface seems to accommodate oxygen atoms along the steps forming one or several subsequent adsorbate structures and rapidly transforms into a combination of (332), (111) and (331) facets likely providing the room for the formation of a surface oxide. For the case of large excess of O2, the diffraction data show the presence of a multilayer PdO with the [101] crystallographic direction parallel to the [111] and the [331] directions of the substrate. The reconstructions in O2 excess are to a large extent similar to those previously reported for pure O2 exposures by Westerström et al. [R. Westerström et al., Phys. Rev. B: Condens. Matter Mater. Phys., 2007, 76, 155410]. (Less)
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organization
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type
Contribution to journal
publication status
published
subject
in
Physical chemistry chemical physics : PCCP
volume
18
issue
30
pages
9 pages
publisher
Royal Society of Chemistry
external identifiers
  • pmid:26805438
  • scopus:84979900843
  • wos:000381428600034
ISSN
1463-9084
DOI
10.1039/c5cp07488f
language
English
LU publication?
yes
id
a44b1585-09df-4962-9a9b-3f570ee7c6fa (old id 8573887)
date added to LUP
2016-02-11 22:08:53
date last changed
2017-10-01 04:30:02
@article{a44b1585-09df-4962-9a9b-3f570ee7c6fa,
  abstract     = {In an attempt to bridge the material and pressure gaps - two major challenges for an atomic scale understanding of heterogeneous catalysis - we employed high-energy surface X-ray diffraction as a tool to study the Pd(553) surface in situ under changing reaction conditions during CO oxidation. The diffraction patterns recorded under CO rich reaction conditions are characteristic for the metallic state of the surface. In an environment with low excess of O2 over the reaction stoichiometry, the surface seems to accommodate oxygen atoms along the steps forming one or several subsequent adsorbate structures and rapidly transforms into a combination of (332), (111) and (331) facets likely providing the room for the formation of a surface oxide. For the case of large excess of O2, the diffraction data show the presence of a multilayer PdO with the [101] crystallographic direction parallel to the [111] and the [331] directions of the substrate. The reconstructions in O2 excess are to a large extent similar to those previously reported for pure O2 exposures by Westerström et al. [R. Westerström et al., Phys. Rev. B: Condens. Matter Mater. Phys., 2007, 76, 155410].},
  author       = {Shipilin, Mikhail and Gustafson, Johan and Zhang, Chu and Merte, Lindsay and Lundgren, Edvin},
  issn         = {1463-9084},
  language     = {eng},
  month        = {01},
  number       = {30},
  pages        = {20312--20320},
  publisher    = {Royal Society of Chemistry},
  series       = {Physical chemistry chemical physics : PCCP},
  title        = {Step dynamics and oxide formation during CO oxidation over a vicinal Pd surface.},
  url          = {http://dx.doi.org/10.1039/c5cp07488f},
  volume       = {18},
  year         = {2016},
}