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Sulfur Oxidation on Pt(355): It Is the Steps!

Authors

  • Regine Streber,

    1. Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen (Germany), Fax: (+49) 1931-852-8867
    2. Erlangen Catalysis Resource Center (ECRC), Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen (Germany)
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  • Christian Papp Dr.,

    1. Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen (Germany), Fax: (+49) 1931-852-8867
    2. Erlangen Catalysis Resource Center (ECRC), Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen (Germany)
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  • Michael P. A. Lorenz,

    1. Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen (Germany), Fax: (+49) 1931-852-8867
    2. Erlangen Catalysis Resource Center (ECRC), Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen (Germany)
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  • Andreas Bayer Dr.,

    1. Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen (Germany), Fax: (+49) 1931-852-8867
    2. Erlangen Catalysis Resource Center (ECRC), Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen (Germany)
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  • Reinhard Denecke Prof. Dr.,

    1. Willhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstrasse 2, 04103 Leipzig (Germany)
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  • Hans-Peter Steinrück Prof. Dr.

    1. Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen (Germany), Fax: (+49) 1931-852-8867
    2. Erlangen Catalysis Resource Center (ECRC), Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen (Germany)
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  • This work was supported by the Excellence Cluster “Engineering of Advanced Materials” granted to the University of Erlangen-Nuremberg. We also thank the BMBF for financial support through grant 05 ES3XBA/5 and the BESSY staff for their assistance during beamtime.

Abstract

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Steps in the right direction: The role of steps in the removal of sulfur from a Pt model catalyst, via metastable SO3 and SO4 species, was demonstrated by in situ high-resolution X-ray photoelectron spectroscopy. From isothermal experiments the activation energy of the rate-determining step was deduced to be 34 kJ mol−1.

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