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A Polycrystalline Pd Surface Studied by Two-Dimensional Surface Optical Reflectance during CO Oxidation : Bridging the Materials Gap

Pfaff, Sebastian LU ; Larsson, Alfred LU ; Orlov, Dmytro LU orcid ; Rämisch, Lisa LU ; Gericke, Sabrina M LU ; Lundgren, Edvin LU and Zetterberg, Johan LU orcid (2023) In ACS applied materials & interfaces
Abstract

Industrial catalysts are complex materials systems operating in harsh environments. The active parts of the catalysts are nanoparticles that expose different facets with different surface orientations at which the catalytic reactions occur. However, these facets are close to impossible to study in detail under industrially relevant operating conditions. Instead, simpler model systems, such as single crystals with a well-defined surface orientation, have been successfully used to study gas-surface interactions such as adsorption and desorption, surface oxidation, and oxidation/reduction reactions. To more closely mimic the many facets exhibited by nanoparticles and thereby close the so-called materials gap, there has also been a recent... (More)

Industrial catalysts are complex materials systems operating in harsh environments. The active parts of the catalysts are nanoparticles that expose different facets with different surface orientations at which the catalytic reactions occur. However, these facets are close to impossible to study in detail under industrially relevant operating conditions. Instead, simpler model systems, such as single crystals with a well-defined surface orientation, have been successfully used to study gas-surface interactions such as adsorption and desorption, surface oxidation, and oxidation/reduction reactions. To more closely mimic the many facets exhibited by nanoparticles and thereby close the so-called materials gap, there has also been a recent move toward using polycrystalline surfaces and curved crystals. However, these studies are limited either by the pressure or spatial resolution at realistic pressures or by the number of surfaces studied simultaneously. In this work, we demonstrate the use of reflectance microscopy to study a vast number of catalytically active surfaces simultaneously under realistic and identical reaction conditions. As a proof of concept, we have conducted an
operando experiment to study CO oxidation over a Pd polycrystal, where the polycrystalline surface acts as a collection of many single-crystal surfaces. Finally, we visualized the resulting data by plotting the reflectivity as a function of surface orientation. We think the techniques and visualization methods introduced in this work will be key toward bridging the materials gap in catalysis.

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organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
mass spectrometry, microscopy, operando catalysis, palladium, polycrystal, surface orientation library
in
ACS applied materials & interfaces
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85180996814
  • pmid:38109219
ISSN
1944-8244
DOI
10.1021/acsami.3c11341
language
English
LU publication?
yes
id
fac8096b-c976-4244-b866-109d5cf0795a
date added to LUP
2023-12-19 16:56:14
date last changed
2024-04-17 12:54:04
@article{fac8096b-c976-4244-b866-109d5cf0795a,
  abstract     = {{<p>Industrial catalysts are complex materials systems operating in harsh environments. The active parts of the catalysts are nanoparticles that expose different facets with different surface orientations at which the catalytic reactions occur. However, these facets are close to impossible to study in detail under industrially relevant operating conditions. Instead, simpler model systems, such as single crystals with a well-defined surface orientation, have been successfully used to study gas-surface interactions such as adsorption and desorption, surface oxidation, and oxidation/reduction reactions. To more closely mimic the many facets exhibited by nanoparticles and thereby close the so-called materials gap, there has also been a recent move toward using polycrystalline surfaces and curved crystals. However, these studies are limited either by the pressure or spatial resolution at realistic pressures or by the number of surfaces studied simultaneously. In this work, we demonstrate the use of reflectance microscopy to study a vast number of catalytically active surfaces simultaneously under realistic and identical reaction conditions. As a proof of concept, we have conducted an<br>
 operando experiment to study CO oxidation over a Pd polycrystal, where the polycrystalline surface acts as a collection of many single-crystal surfaces. Finally, we visualized the resulting data by plotting the reflectivity as a function of surface orientation. We think the techniques and visualization methods introduced in this work will be key toward bridging the materials gap in catalysis.<br>
 </p>}},
  author       = {{Pfaff, Sebastian and Larsson, Alfred and Orlov, Dmytro and Rämisch, Lisa and Gericke, Sabrina M and Lundgren, Edvin and Zetterberg, Johan}},
  issn         = {{1944-8244}},
  keywords     = {{mass spectrometry; microscopy; operando catalysis; palladium; polycrystal; surface orientation library}},
  language     = {{eng}},
  month        = {{12}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{ACS applied materials & interfaces}},
  title        = {{A Polycrystalline Pd Surface Studied by Two-Dimensional Surface Optical Reflectance during CO Oxidation : Bridging the Materials Gap}},
  url          = {{http://dx.doi.org/10.1021/acsami.3c11341}},
  doi          = {{10.1021/acsami.3c11341}},
  year         = {{2023}},
}