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 Smirnov, E. I. Vovk, A. V. Kalinkin, P. A. Simonov, E. Yu Gerasimov, V. I. Bukhtiyarov

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

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.

Original languageEnglish
Pages (from-to)663-671
Number of pages9
JournalKinetics and Catalysis
Volume59
Issue number5
DOIs
Publication statusPublished - 1 Sep 2018

Keywords

  • core–shell structure
  • nitrogen dioxide
  • platinum
  • Sibunit
  • XPS
  • THERMAL-STABILITY
  • IN-SITU OXIDATION
  • SIZE
  • STATE
  • PT/C CATALYSTS
  • CO OXIDATION
  • OXYGEN
  • NANOPARTICLES
  • SUPPORT
  • core-shell structure
  • NITROGEN-DIOXIDE

Fingerprint Dive into the research topics of 'Formation of Surface Platinum Oxides in the Interaction of the Pt/Sibunit Catalysts with NO<sub>2</sub>: Estimates of the Width of Oxide Shell from XPS Data'. Together they form a unique fingerprint.

Cite this