A spectroscopic study of the chemistry and reactivity of SO2 on Pt{111}: Reactions with O2, CO and C3H6

K. Wilson, C. Hardacre, C. J. Baddeley, J. Lüdecke, D. P. Woodruff, R. M. Lambert

    Research output: Contribution to journalArticlepeer-review

    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 η2 S-O coordination to the surface. On annealing to 270 K, NEXAFS indicates the SO2 molecular plane essentially perpendicular to the surface. Preadsorbed Oa 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 Sa, 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

    • Adsorption kinetics
    • Alkenes
    • Carbon monoxide
    • Catalysis
    • Chemisorption
    • Electron energy loss spectroscopy
    • Low index single crystal surfaces
    • Near edge extended X-ray absorption fine structure (NEXAFS)
    • Oxidation
    • Oxygen
    • Platinum

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