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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 ...

  • American Institute of Physics (AIP),2019
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:kth-266742
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-266742URI
  • https://doi.org/10.1063/1.5109321DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-178584URI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • QC 20200117
  • 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.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Degerman, DavidStockholms universitet,Fysikum(Swepub:su)jalex (author)
  • Lee, Ming-TaoStockholms universitet,Fysikum (author)
  • Alexander, John D.Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, S-10691 Stockholm, Sweden. (author)
  • Shipilin, MikhailStockholms universitet,Fysikum(Swepub:su)mish6774 (author)
  • Wang, Hsin-YiStockholms universitet,Fysikum(Swepub:su)hswan (author)
  • Cavalca, FilippoStockholms universitet,Fysikum (author)
  • Weston, MatthewStockholms universitet,Fysikum(Swepub:su)matwe (author)
  • Gladh, JörgenStockholms universitet,Fysikum(Swepub:su)gladh (author)
  • Blom, MikaelStockholms universitet,Fysikum(Swepub:su)mblom (author)
  • Björkhage, MikaelStockholms universitet,Fysikum(Swepub:su)bjorkhage (author)
  • Löfgren, PatrikStockholms universitet,Fysikum(Swepub:su)lofgren (author)
  • Schlueter, ChristophDeutsch Elektronen Synchrotron DESY, Photon Sci, Notkestr 85, D-22607 Hamburg, Germany. (author)
  • Loemker, PatrickDeutsch Elektronen Synchrotron DESY, Photon Sci, Notkestr 85, D-22607 Hamburg, Germany. (author)
  • Ederer, KatrinDeutsch Elektronen Synchrotron DESY, Photon Sci, Notkestr 85, D-22607 Hamburg, Germany. (author)
  • Drube, WolfgangDeutsch Elektronen Synchrotron DESY, Photon Sci, Notkestr 85, D-22607 Hamburg, Germany. (author)
  • Noei, HeshmatDeutsch Elektronen Synchrotron DESY, DESY NanoLab, D-22607 Hamburg, Germany. (author)
  • Zehetner, JohannUniv Appl Sci, Res Ctr Mikrotechnol, Hsch Str 1, A-6850 Dornbirn, Austria. (author)
  • Wentzel, HenrikKTH,Skolan för teknikvetenskap (SCI),Teknik vetenskap(Swepub:kth)u14km5r5 (author)
  • Ahlund, JohnScienta Omicron AB, POB 15120, SE-75015 Uppsala, Sweden. (author)
  • Nilsson, AndersStockholms universitet,Fysikum(Swepub:su)andersn (author)
  • Stockholms universitetFysikum (creator_code:org_t)

Related titles

  • In:Review of Scientific Instruments: American Institute of Physics (AIP)90:100034-67481089-7623

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