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Kinetics and Catalysis

, Volume 59, Issue 5, pp 663–671 | Cite as

Formation of Surface Platinum Oxides in the Interaction of the Pt/Sibunit Catalysts with NO2: Estimates of the Width of Oxide Shell from XPS Data

  • M. Yu. SmirnovEmail author
  • E. I. Vovk
  • A. V. Kalinkin
  • P. A. Simonov
  • E. Yu. Gerasimov
  • V. I. Bukhtiyarov
Article
  • 25 Downloads

Abstract

The method of X-ray photoelectron spectroscopy (XPS) using two types of radiation, nonmonochromatic AlKα (hν = 1486.6 eV) and monochromatic AgLα (hν = 2984.3 eV), was used to study the interaction of the Pt/C (C = Sibunit) catalysts with NO2, which occurs in the preparation chamber of an XPS spectrometer at room temperature and NO2 pressure, equal to 3 × 10–6 mbar. It was found that, under these conditions, platinum was partially oxidized and metallic core becomes covered with a shell formed by a mixture of PtO and PtO2 oxides. The ratio of intensities Pt4f and Pt3d5/2 belonging to platinum oxides to the corresponding intensities of metallic platinum was used to estimate the width of oxide shell. For two of the three studied Pt/C samples, the width of the shell was 0.15–0.3 nm, which approximately corresponds to one monolayer of platinum oxide with a stoichiometry of PtO or PtO2.

Keywords

platinum Sibunit XPS nitrogen dioxide core–shell structure 

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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • M. Yu. Smirnov
    • 1
    Email author
  • E. I. Vovk
    • 1
  • A. V. Kalinkin
    • 1
  • P. A. Simonov
    • 1
  • E. Yu. Gerasimov
    • 1
  • V. I. Bukhtiyarov
    • 1
    • 2
  1. 1.Boreskov Institute of Catalysis, Siberian BranchRussian Academy of SciencesNovosibirskRussia
  2. 2.Novosibirsk State UniversityNovosibirskRussia

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