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

Research output: Contribution to journalArticle

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.

Details

Authors
Organisations
External organisations
  • Stockholm University
  • German Electron Synchrotron (DESY)
  • Lund University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Other Chemical Engineering
  • Other Physics Topics
Original languageEnglish
Article number033703
JournalReview of Scientific Instruments
Volume90
Issue number3
Publication statusPublished - 2019 Mar 13
Publication categoryResearch
Peer-reviewedYes