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CO Oxidation Over Monolayer Manganese Oxide Films on Pt(111)

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Abstract

Ultrathin manganese oxide films grown on Pt(111) were examined in the low temperature CO oxidation reaction at near atmospheric pressures. Structural characterization was performed by X-ray photoelectron spectroscopy, Auger electron spectroscopy, high-resolution electron energy loss spectroscopy, and temperature programmed desorption. The results show that the reactivity of MnOx ultrathin films is governed by a weakly bonded oxygen species, which may even be formed at low oxygen pressures (~10−6 mbar). For stable catalytic performance at realistic conditions the films required highly oxidizing conditions (CO:O2 < 1:10), otherwise the films dewetted, ultimately resulting in the catalyst deactivation. Comparison with other thin films on Pt(111) shows, that the desorption temperature of weakly bonded oxygen species can be used as a benchmark for its activity in this reaction.

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Acknowledgments

The Swedish part of the work was supported by the Swedish Research Council (VR) and the Göran Gustafsson Foundation. Prof. J. Schnadt, Dr. J. Knudsen and the MAX-lab staff are gratefully acknowledged for their support. The FHI team acknowledges the support from the COST Action CM1104 “Reducible oxide chemistry, structure and functions”. WW, SS, and SP gratefully acknowledge financial support by the Deutsche Forschungsgemeinschaft through SFB 762 “Functionality of Oxidic Interfaces”. Finally, we thank Prof. L. Spiccia for fruitful discussions.

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Authors and Affiliations

  1. Abteilung Chemische Physik, Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195, Berlin, Germany

    Y. Martynova, S. Shaikhutdinov & H.-J. Freund

  2. Material Physics, KTH Royal Institute of Technology, 16440, Kista, Sweden

    M. Soldemo & J. Weissenrieder

  3. Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, 06120, Halle, Germany

    S. Sachert, S. Polzin & W. Widdra

  4. Max-Planck-Institut für Mikrostrukturphysik, 06120, Halle, Germany

    W. Widdra

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  1. Y. Martynova
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Correspondence to S. Shaikhutdinov.

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Martynova, Y., Soldemo, M., Weissenrieder, J. et al. CO Oxidation Over Monolayer Manganese Oxide Films on Pt(111). Catal Lett 143, 1108–1115 (2013). https://doi.org/10.1007/s10562-013-1117-0

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  • DOI: https://doi.org/10.1007/s10562-013-1117-0

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