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Simultaneous Imaging of Gas Phase over and Surface Reflectance of a Pd(100) Single Crystal during CO Oxidation

Zhou, Jianfeng LU ; Blomberg, Sara LU ; Gustafson, Johan LU ; Lundgren, Edvin LU and Zetterberg, Johan LU orcid (2017) In Journal of Physical Chemistry C 121(42). p.23511-23519
Abstract

A direct correlation between the reaction activity and the surface structure of a catalyst is generally needed to better understand the mechanisms behind the heterogeneous catalysis process. In this work, we employed planar laser-induced fluorescence (PLIF) to spatially resolve the CO2 distribution just above a Pd(100) surface, and simultaneously monitored the optical reflectance of the surface, during CO oxidation. We show that when the reaction is in the mass transfer limited regime, the inhomogeneity of the gas composition over the sample can lead to an inhomogeneity of the surface reflectance change arising from oxide formation and surface roughening. The combination of PLIF and surface reflectance also makes it possible... (More)

A direct correlation between the reaction activity and the surface structure of a catalyst is generally needed to better understand the mechanisms behind the heterogeneous catalysis process. In this work, we employed planar laser-induced fluorescence (PLIF) to spatially resolve the CO2 distribution just above a Pd(100) surface, and simultaneously monitored the optical reflectance of the surface, during CO oxidation. We show that when the reaction is in the mass transfer limited regime, the inhomogeneity of the gas composition over the sample can lead to an inhomogeneity of the surface reflectance change arising from oxide formation and surface roughening. The combination of PLIF and surface reflectance also makes it possible to spatially resolve and simultaneously follow the dynamics of the gas phase and the surface on a subsecond time scale during self-sustained reaction oscillations of a Pd(100) surface, providing insights into the gas-surface interaction.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry C
volume
121
issue
42
pages
9 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • wos:000414114800030
  • scopus:85032621468
ISSN
1932-7447
DOI
10.1021/acs.jpcc.7b08108
language
English
LU publication?
yes
id
2ca92331-3579-4743-a207-1bb97bac74d2
date added to LUP
2017-11-10 11:38:37
date last changed
2025-04-04 15:06:28
@article{2ca92331-3579-4743-a207-1bb97bac74d2,
  abstract     = {{<p>A direct correlation between the reaction activity and the surface structure of a catalyst is generally needed to better understand the mechanisms behind the heterogeneous catalysis process. In this work, we employed planar laser-induced fluorescence (PLIF) to spatially resolve the CO<sub>2</sub> distribution just above a Pd(100) surface, and simultaneously monitored the optical reflectance of the surface, during CO oxidation. We show that when the reaction is in the mass transfer limited regime, the inhomogeneity of the gas composition over the sample can lead to an inhomogeneity of the surface reflectance change arising from oxide formation and surface roughening. The combination of PLIF and surface reflectance also makes it possible to spatially resolve and simultaneously follow the dynamics of the gas phase and the surface on a subsecond time scale during self-sustained reaction oscillations of a Pd(100) surface, providing insights into the gas-surface interaction.</p>}},
  author       = {{Zhou, Jianfeng and Blomberg, Sara and Gustafson, Johan and Lundgren, Edvin and Zetterberg, Johan}},
  issn         = {{1932-7447}},
  language     = {{eng}},
  month        = {{10}},
  number       = {{42}},
  pages        = {{23511--23519}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Journal of Physical Chemistry C}},
  title        = {{Simultaneous Imaging of Gas Phase over and Surface Reflectance of a Pd(100) Single Crystal during CO Oxidation}},
  url          = {{http://dx.doi.org/10.1021/acs.jpcc.7b08108}},
  doi          = {{10.1021/acs.jpcc.7b08108}},
  volume       = {{121}},
  year         = {{2017}},
}