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Visualization of gas distribution in a model AP-XPS reactor by PLIF : Co oxidation over a Pd(100) catalyst

Zhou, Jianfeng LU ; Blomberg, Sara LU ; Gustafson, Johan LU ; Lundgren, Edvin LU and Zetterberg, Johan LU (2017) In Catalysts 7(1).
Abstract

In situ knowledge of the gas phase around a catalyst is essential to make an accurate correlation between the catalytic activity and surface structure in operando studies. Although ambient pressure X-ray photoelectron spectroscopy (AP-XPS) can provide information on the gas phase as well as the surface structure of a working catalyst, the gas phase detected has not been spatially resolved to date, thus possibly making it ambiguous to interpret the AP-XPS spectra. In this work, planar laser-induced fluorescence (PLIF) is used to visualize the CO2 distribution in a model AP-XPS reactor, during CO oxidation over a Pd(100) catalyst. The results show that the gas composition in the vicinity of the sample measured by PLIF is... (More)

In situ knowledge of the gas phase around a catalyst is essential to make an accurate correlation between the catalytic activity and surface structure in operando studies. Although ambient pressure X-ray photoelectron spectroscopy (AP-XPS) can provide information on the gas phase as well as the surface structure of a working catalyst, the gas phase detected has not been spatially resolved to date, thus possibly making it ambiguous to interpret the AP-XPS spectra. In this work, planar laser-induced fluorescence (PLIF) is used to visualize the CO2 distribution in a model AP-XPS reactor, during CO oxidation over a Pd(100) catalyst. The results show that the gas composition in the vicinity of the sample measured by PLIF is significantly different from that measured by a conventional mass spectrometer connected to a nozzle positioned just above the sample. In addition, the gas distribution above the catalytic sample has a strong dependence on the gas flow and total chamber pressure. The technique presented has the potential to increase our knowledge of the gas phase in AP-XPS, as well as to optimize the design and operating conditions of in situ AP-XPS reactors for catalysis studies.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
AP-XPS, Boundary layer, CO oxidation, PLIF
in
Catalysts
volume
7
issue
1
publisher
Multidisciplinary Digital Publishing Institute (MDPI)
external identifiers
  • scopus:85010420417
  • wos:000395426100028
DOI
10.3390/catal7010029
language
English
LU publication?
yes
id
460ea5ba-2992-4deb-871a-4e3c1eb70c85
date added to LUP
2017-02-28 11:13:15
date last changed
2018-01-07 11:53:04
@article{460ea5ba-2992-4deb-871a-4e3c1eb70c85,
  abstract     = {<p>In situ knowledge of the gas phase around a catalyst is essential to make an accurate correlation between the catalytic activity and surface structure in operando studies. Although ambient pressure X-ray photoelectron spectroscopy (AP-XPS) can provide information on the gas phase as well as the surface structure of a working catalyst, the gas phase detected has not been spatially resolved to date, thus possibly making it ambiguous to interpret the AP-XPS spectra. In this work, planar laser-induced fluorescence (PLIF) is used to visualize the CO<sub>2</sub> distribution in a model AP-XPS reactor, during CO oxidation over a Pd(100) catalyst. The results show that the gas composition in the vicinity of the sample measured by PLIF is significantly different from that measured by a conventional mass spectrometer connected to a nozzle positioned just above the sample. In addition, the gas distribution above the catalytic sample has a strong dependence on the gas flow and total chamber pressure. The technique presented has the potential to increase our knowledge of the gas phase in AP-XPS, as well as to optimize the design and operating conditions of in situ AP-XPS reactors for catalysis studies.</p>},
  articleno    = {29},
  author       = {Zhou, Jianfeng and Blomberg, Sara and Gustafson, Johan and Lundgren, Edvin and Zetterberg, Johan},
  keyword      = {AP-XPS,Boundary layer,CO oxidation,PLIF},
  language     = {eng},
  month        = {01},
  number       = {1},
  publisher    = {Multidisciplinary Digital Publishing Institute (MDPI)},
  series       = {Catalysts},
  title        = {Visualization of gas distribution in a model AP-XPS reactor by PLIF : Co oxidation over a Pd(100) catalyst},
  url          = {http://dx.doi.org/10.3390/catal7010029},
  volume       = {7},
  year         = {2017},
}