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A high-pressure x-r...
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Amann, PeterStockholms universitet,Fysikum
(author)
A high-pressure x-ray photoelectron spectroscopy instrument for studies of industrially relevant catalytic reactions at pressures of several bars
- Article/chapterEnglish2019
Publisher, publication year, extent ...
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American Institute of Physics (AIP),2019
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Numbers
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LIBRIS-ID:oai:DiVA.org:kth-266742
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-266742URI
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https://doi.org/10.1063/1.5109321DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-178584URI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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QC 20200117
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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.
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Degerman, DavidStockholms universitet,Fysikum(Swepub:su)jalex
(author)
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Lee, Ming-TaoStockholms universitet,Fysikum
(author)
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Alexander, John D.Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, S-10691 Stockholm, Sweden.
(author)
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Shipilin, MikhailStockholms universitet,Fysikum(Swepub:su)mish6774
(author)
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Wang, Hsin-YiStockholms universitet,Fysikum(Swepub:su)hswan
(author)
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Cavalca, FilippoStockholms universitet,Fysikum
(author)
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Weston, MatthewStockholms universitet,Fysikum(Swepub:su)matwe
(author)
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Gladh, JörgenStockholms universitet,Fysikum(Swepub:su)gladh
(author)
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Blom, MikaelStockholms universitet,Fysikum(Swepub:su)mblom
(author)
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Björkhage, MikaelStockholms universitet,Fysikum(Swepub:su)bjorkhage
(author)
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Löfgren, PatrikStockholms universitet,Fysikum(Swepub:su)lofgren
(author)
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Schlueter, ChristophDeutsch Elektronen Synchrotron DESY, Photon Sci, Notkestr 85, D-22607 Hamburg, Germany.
(author)
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Loemker, PatrickDeutsch Elektronen Synchrotron DESY, Photon Sci, Notkestr 85, D-22607 Hamburg, Germany.
(author)
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Ederer, KatrinDeutsch Elektronen Synchrotron DESY, Photon Sci, Notkestr 85, D-22607 Hamburg, Germany.
(author)
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Drube, WolfgangDeutsch Elektronen Synchrotron DESY, Photon Sci, Notkestr 85, D-22607 Hamburg, Germany.
(author)
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Noei, HeshmatDeutsch Elektronen Synchrotron DESY, DESY NanoLab, D-22607 Hamburg, Germany.
(author)
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Zehetner, JohannUniv Appl Sci, Res Ctr Mikrotechnol, Hsch Str 1, A-6850 Dornbirn, Austria.
(author)
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Wentzel, HenrikKTH,Skolan för teknikvetenskap (SCI),Teknik vetenskap(Swepub:kth)u14km5r5
(author)
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Ahlund, JohnScienta Omicron AB, POB 15120, SE-75015 Uppsala, Sweden.
(author)
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Nilsson, AndersStockholms universitet,Fysikum(Swepub:su)andersn
(author)
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Stockholms universitetFysikum
(creator_code:org_t)
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In:Review of Scientific Instruments: American Institute of Physics (AIP)90:100034-67481089-7623
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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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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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Stockholm University