Infrared surface spectroscopy and surface optical reflectance for operando catalyst surface characterization

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Abstract

Using a new sample environment, the two operando surface diagnostic techniques two-dimensional surface optical reflection (2D-SOR) and polarization-modulated infrared reflection–absorption spectroscopy (PM-IRRAS) have been combined with mass spectrometry (MS) to characterize a catalytic reaction. With both techniques integrated in a custom-built setup, we can correlate molecular information of the adsorbed surface species from PM-IRRAS with information about oxide formation on the sample from 2D-SOR. The new setup was evaluated by performing CO oxidation over a Palladium single crystal Pd(1 0 0) surface. The results reveal that the macroscopic and the microscopic molecular behavior correlate well. When the CO adsorption peak disappears in the PM-IRRAS spectrum, the formation of a well-defined ultra-thin surface oxide is observed in the 2D-SOR trend. We discuss the benefits and limitations of the two techniques as well as their potential for further studies of catalytic reactions at both gas–solid and liquid–solid interfaces.

Original languageEnglish
Article number152048
JournalApplied Surface Science
Volume578
DOIs
Publication statusPublished - 2022 Mar 15

Subject classification (UKÄ)

  • Atom and Molecular Physics and Optics

Free keywords

  • CO oxidation
  • Heterogeneous catalysis
  • Operando techniques
  • Pd(1 0 0)
  • PM-IRRAS
  • Surface optical reflectance (2D-SOR)

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