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This study combined High Energy Surface X-Ray Diffraction (HESXRD), optical reflectance, and laser fluorescence for operando catalysis research. The integrated approach revealed insights into CO oxidation on Pd(100) catalysts, highlighting surface heterogeneity.

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Area of Science:

  • Catalysis Science
  • Surface Science
  • Materials Science

Background:

  • Understanding catalytic processes at the molecular level is crucial for developing efficient industrial catalysts.
  • Operando studies, which monitor catalysts under reaction conditions, provide critical insights into dynamic surface changes.
  • Previous research indicated that Pd(100) surfaces exhibit high activity during CO oxidation before oxide formation is detected.

Purpose of the Study:

  • To combine High Energy Surface X-Ray Diffraction (HESXRD), Surface Optical Reflectance, and Planar Laser Induced Fluorescence for operando studies.
  • To investigate the CO oxidation reaction over a Pd(100) catalyst.
  • To correlate surface structure and morphology changes with catalytic activity at high temporal resolution.

Main Methods:

  • Utilized a multi-technique approach including High Energy Surface X-Ray Diffraction (HESXRD), Surface Optical Reflectance, and Planar Laser Induced Fluorescence.
  • Performed operando studies to observe catalyst behavior under actual reaction conditions.
  • Ensured the probed region was representative of the entire sample surface.

Main Results:

  • Confirmed that the Pd(100) surface achieves high catalytic activity prior to detectable oxide formation.
  • Demonstrated the capability of the combined techniques to verify the representativeness of probed surface regions.
  • Observed and correlated changes in gas composition and surface structure/morphology with catalytic performance at high temporal resolution.
  • Revealed that the Pd(100) catalyst surface does not exhibit homogeneous behavior during CO oxidation.

Conclusions:

  • The combination of HESXRD, optical reflectance, and laser fluorescence offers valuable insights into operando catalysis.
  • Surface heterogeneity in Pd(100) catalysts under mass-transfer-limited conditions is likely due to inhomogeneous gas exposure.
  • This integrated approach is effective for studying dynamic changes in catalytic systems.