Combining high-energy X-ray diffraction with Surface Optical Reflectance and Planar Laser Induced Fluorescence for operando catalyst surface characterization

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

We have combined three techniques, High Energy Surface X-Ray Diffraction (HESXRD), Surface Optical Reflectance, and Planar Laser Induced Fluorescence in an operando study of CO oxidation over a Pd(100) catalyst. We show that these techniques provide useful new insights such as the ability to verify that the finite region being probed by techniques such as HESXRD is representative of the sample surface as a whole. The combination is also suitable to determine when changes in gas composition or surface structure and/or morphology occur and to subsequently correlate them with high temporal resolution. In the study, we confirm previous results which show that the Pd(100) surface reaches high activity before an oxide can be detected. Furthermore, we show that the single crystal catalyst surface does not behave homogeneously, which we attribute to the surface being exposed to inhomogeneous gas conditions in mass transfer limited scenarios.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • Stockholms universitet
  • German Electron Synchrotron (DESY)
  • Lund University
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Annan kemiteknik
  • Annan fysik
Originalspråkengelska
Artikelnummer033703
TidskriftReview of Scientific Instruments
Volym90
Utgivningsnummer3
StatusPublished - 2019 mar 13
PublikationskategoriForskning
Peer review utfördJa