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A high-pressure x-r...
A high-pressure x-ray photoelectron spectroscopy instrument for studies of industrially relevant catalytic reactions at pressures of several bars
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- Amann, Peter (författare)
- Stockholms universitet,Fysikum
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- Degerman, David (författare)
- Stockholms universitet,Fysikum
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- Lee, Ming-Tao (författare)
- Stockholms universitet,Fysikum
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- Alexander, John D. (författare)
- Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, S-10691 Stockholm, Sweden.
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- Shipilin, Mikhail (författare)
- Stockholms universitet,Fysikum
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- Wang, Hsin-Yi (författare)
- Stockholms universitet,Fysikum
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- Cavalca, Filippo (författare)
- Stockholms universitet,Fysikum
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- Weston, Matthew (författare)
- Stockholms universitet,Fysikum
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- Gladh, Jörgen (författare)
- Stockholms universitet,Fysikum
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- Blom, Mikael (författare)
- Stockholms universitet,Fysikum
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- Björkhage, Mikael (författare)
- Stockholms universitet,Fysikum
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- Löfgren, Patrik (författare)
- Stockholms universitet,Fysikum
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- Schlueter, Christoph (författare)
- Deutsch Elektronen Synchrotron DESY, Photon Sci, Notkestr 85, D-22607 Hamburg, Germany.
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- Loemker, Patrick (författare)
- Deutsch Elektronen Synchrotron DESY, Photon Sci, Notkestr 85, D-22607 Hamburg, Germany.
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- Ederer, Katrin (författare)
- Deutsch Elektronen Synchrotron DESY, Photon Sci, Notkestr 85, D-22607 Hamburg, Germany.
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- Drube, Wolfgang (författare)
- Deutsch Elektronen Synchrotron DESY, Photon Sci, Notkestr 85, D-22607 Hamburg, Germany.
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- Noei, Heshmat (författare)
- Deutsch Elektronen Synchrotron DESY, DESY NanoLab, D-22607 Hamburg, Germany.
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- Zehetner, Johann (författare)
- Univ Appl Sci, Res Ctr Mikrotechnol, Hsch Str 1, A-6850 Dornbirn, Austria.
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- Wentzel, Henrik (författare)
- KTH,Skolan för teknikvetenskap (SCI),Teknik vetenskap
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- Ahlund, John (författare)
- Scienta Omicron AB, POB 15120, SE-75015 Uppsala, Sweden.
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- Nilsson, Anders (författare)
- Stockholms universitet,Fysikum
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(creator_code:org_t)
- American Institute of Physics (AIP), 2019
- 2019
- Engelska.
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Ingår i: Review of Scientific Instruments. - : American Institute of Physics (AIP). - 0034-6748 .- 1089-7623. ; 90:10
- Relaterad länk:
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https://bib-pubdb1.d...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- We present a new high-pressure x-ray photoelectron spectroscopy system dedicated to probing catalytic reactions under realistic conditions at pressures of multiple bars. The instrument builds around the novel concept of a "virtual cell" in which a gas flow onto the sample surface creates a localized high-pressure pillow. This allows the instrument to be operated with a low pressure of a few millibar in the main chamber, while simultaneously a local pressure exceeding 1 bar can be supplied at the sample surface. Synchrotron based hard x-ray excitation is used to increase the electron mean free path in the gas region between sample and analyzer while grazing incidence <5 degrees close to total external refection conditions enhances surface sensitivity. The aperture separating the high-pressure region from the differential pumping of the electron spectrometer consists of multiple, evenly spaced, micrometer sized holes matching the footprint of the x-ray beam on the sample. The resulting signal is highly dependent on the sample-to-aperture distance because photoemitted electrons are subject to strong scattering in the gas phase. Therefore, high precision control of the sample-to-aperture distance is crucial. A fully integrated manipulator allows for sample movement with step sizes of 10 nm between 0 and -5 mm with very low vibrational amplitude and also for sample heating up to 500 degrees C under reaction conditions. We demonstrate the performance of this novel instrument with bulk 2p spectra of a copper single crystal at He pressures of up to 2.5 bars and C1s spectra measured in gas mixtures of CO + H-2 at pressures of up to 790 mbar. The capability to detect emitted photoelectrons at several bars opens the prospect for studies of catalytic reactions under industrially relevant operando conditions.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
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- Av författaren/redakt...
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Amann, Peter
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Degerman, David
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Lee, Ming-Tao
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Alexander, John ...
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Shipilin, Mikhai ...
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Wang, Hsin-Yi
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visa fler...
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Cavalca, Filippo
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Weston, Matthew
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Gladh, Jörgen
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Blom, Mikael
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Björkhage, Mikae ...
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Löfgren, Patrik
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Schlueter, Chris ...
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Loemker, Patrick
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Ederer, Katrin
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Drube, Wolfgang
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Noei, Heshmat
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Zehetner, Johann
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Wentzel, Henrik
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Ahlund, John
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Nilsson, Anders
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visa färre...
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- NATURVETENSKAP
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NATURVETENSKAP
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och Fysik
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- NATURVETENSKAP
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NATURVETENSKAP
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och Kemi
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Review of Scient ...
- Av lärosätet
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Kungliga Tekniska Högskolan
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Stockholms universitet