BAR XPS
For Studies of Industrially Relevant Catalytic Reactions
PES HAXPES APPES APXPS AP-HAXPES XPS
- Study of catalytic reactions
- Measuring XPS under conditions of > 1 bar of pressure
- Open-up the possibility of operando studies of heterogeneous catalytic reactions under industrial manufacturing conditions
- Patented technology: SE 542 905 C2, SE 542 904 C2, SE 542 903 C2, SE 542 902 C2
It is estimated that up to 90% of chemical products are produced via catalysis. Many heterogeneous catalytic reactions occur at high pressures and temperatures. To study these types of catalytic reactions, researchers at Stockholm University have constructed an instrument based on Scienta Omicron’s electron spectrometer capable of measuring XPS under conditions of > 1 bar of pressure in the vicinity of the catalytically reactive surface. Through collaboration this capability is available through Scienta Omicron.
The performance of the instrument is demonstrated by measuring bulk 2p spectra from a copper single crystal at He pressures of up to 2.5 bar and C 1s spectra in gas mixtures of CO + H2 at pressures up to 790 mbar. The capability of the instrument opens up the possibility of operando studies of heterogeneous catalytic reactions under industrial manufacturing conditions.
Peter Amann and Anders Nilsson, et. al. present the instrument, which consists of a HiPP-2 analyser, in the Review of Scientific instruments article ´A high-pressure X-ray photoelectron spectroscopy instrument for studies of industrially relevant catalytic reactions at pressures of several bar´.
The instrument follows a modular design with 3 main components: 1) an electron analyser (Scienta Omicron, R4000 & HiPP-2), 2) a main chamber with movable high precision frame, and 3) a high precision hexapod for alignment.
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System Component Highlights
- Precision positioning
- Heating and cooling capabilities
- Instrument access
- High precision endstation positionin
Virtual Gas Cell
Bar XPS uses the virtual gas cell design, which creates a high local pressure area around the sample of > 1 bar.
- The high pressure zone is localized around the sample
- The virtual gas cell lowers gas consumption
- The gas flow reduces the sample contamination
- The virtual cell removes risk of equipment damage due to over pressur
Research
A high-pressure x-ray photoelectron spectroscopy instrument for studies of industrially relevant catalytic reactions at pressures of several bars
Peter Amann, David Degerman, Ming-Tao Lee, John D. Alexander, Mikhail Shipilin, Hsin-Yi Wang, Filippo Cavalca, Matthew Weston, Jörgen Gladh, Mikael Blom, Mikael Björkhage, Patrik Löfgren, Christoph Schlueter, Patrick Loemker, Katrin Ederer, Wolfgang Drube, Heshmat Noei, Johann Zehetner, Henrik Wentzel, John Åhlund and Anders Nilsson
Review of Scientific Instruments 90, 103102 (2019); https://doi.org/10.1063/1.5109321
Results
The State of Zinc in Methanol Synthesis over a Zn/ZnO/Cu(211) Model Catalyst
The active chemical state of zinc (Zn) in a zinc-copper (Zn-Cu) catalyst during carbon dioxide/carbon monoxide (CO2/CO) hydrogenation has been debated to be Zn oxide (ZnO) nanoparticles, metallic Zn, or a Zn-Cu surface alloy. We used...
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BAR XPS Brochure
It is estimated that up to 90 % of chemical products are produced via catalysis. Many heterogeneous catalytic reactions occur at high pressures and temperatures. To study these types of catalytic reactions, researchers at Stockholm University have constructed an instrument capable of measuring XPS under conditions of > 1 bar of pressure in the vicinity of the catalytically reactive surface.