A spectroscopic study of the chemistry and reactivity of SO2 on Pt{111}: Reactions with O-2, CO and C3H6

K Wilson, C Hardacre, CJ Baddeley, J Ludecke, DP Woodruff, RM Lambert

Research output: Contribution to journalArticlepeer-review

80 Citations (Scopus)

Abstract

The chemisorption and reactivity of SO2 on Pt{111} have been studied by HREELS, XPS, NEXAFS and temperature-programmed desorption. At 160 K SO2 adsorbs intact at high coverages, with eta(2) S-O coordination to the surface. On annealing to 270 K, NEXAFS indicates the SO2 molecular plane essentially perpendicular to the surface. Preadsorbed O-a reacts with SO2 to yield adsorbed SO4, identified as the key surface species responsible for SO2-promoted catalytic alkane oxidation. Coadsorbed CO or propene efficiently reduce SO2 overlayers to deposit S-a, and the implications of this for catalytic systems are discussed.

Original languageEnglish
Pages (from-to)279-288
Number of pages10
JournalSurface Science
Volume372
Issue number1-3
Publication statusPublished - 10 Feb 1997

Keywords

  • CATALYSTS
  • oxygen
  • adsorption kinetics
  • sulphur dioxide
  • near edge extended X-ray absorption fine structure (NEXAFS)
  • CARBON-MONOXIDE
  • FILMS
  • thermal desorption
  • chemisorption
  • vibrations of adsorbed molecules
  • catalysis
  • low index single crystal surfaces
  • alkenes
  • OXYGEN
  • solid-gas interfaces
  • thermal desorption spectroscopy
  • X-ray photoelectron spectroscopy
  • SURFACE-REACTIONS
  • oxidation
  • carbon monoxide
  • soft X-ray photoelectron spectroscopy
  • platinum
  • electron energy loss spectroscopy
  • STABILITY
  • ADSORPTION
  • SULFUR
  • OXIDATION

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