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Maximizing Activity and Stability by Turning Gold Catalysis Upside Down: Oxide Particles on Nanoporous Gold

Authors

  • Andre Wichmann,

    1. Centre for Environmental Research and Sustainable Technology, Institute of Applied and Physical Chemistry, University Bremen, Leobener Strasse NW2, 28359 Bremen (Germany), Fax: (+49) 421-218-63188 http://iapc.chemie.uni-bremen.de
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  • Arne Wittstock,

    Corresponding author
    1. Lawrence Livermore National Laboratory, Nanoscale Synthesis and Characterization Laboratory, 7000 East Avenue, CA 94550 (USA)
    • Arne Wittstock, Lawrence Livermore National Laboratory, Nanoscale Synthesis and Characterization Laboratory, 7000 East Avenue, CA 94550 (USA)

      Marcus Bäumer, Centre for Environmental Research and Sustainable Technology, Institute of Applied and Physical Chemistry, University Bremen, Leobener Strasse NW2, 28359 Bremen (Germany), Fax: (+49) 421-218-63188 http://iapc.chemie.uni-bremen.de

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  • Kristian Frank,

    1. Institute of Solid State Physics, University Bremen, Otto-Hahn-Allee 1, 28359 Bremen (Germany)
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  • Monika M. Biener,

    1. Lawrence Livermore National Laboratory, Nanoscale Synthesis and Characterization Laboratory, 7000 East Avenue, CA 94550 (USA)
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  • Björn Neumann,

    1. Centre for Environmental Research and Sustainable Technology, Institute of Applied and Physical Chemistry, University Bremen, Leobener Strasse NW2, 28359 Bremen (Germany), Fax: (+49) 421-218-63188 http://iapc.chemie.uni-bremen.de
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  • Prof. Lutz Mädler,

    1. Institut für Werkstofftechnik, University Bremen, Badgasteiner Strasse 3, 28359 Bremen (Germany)
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  • Jürgen Biener,

    1. Lawrence Livermore National Laboratory, Nanoscale Synthesis and Characterization Laboratory, 7000 East Avenue, CA 94550 (USA)
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  • Prof. Andreas Rosenauer,

    1. Institute of Solid State Physics, University Bremen, Otto-Hahn-Allee 1, 28359 Bremen (Germany)
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  • Prof. Marcus Bäumer

    Corresponding author
    1. Centre for Environmental Research and Sustainable Technology, Institute of Applied and Physical Chemistry, University Bremen, Leobener Strasse NW2, 28359 Bremen (Germany), Fax: (+49) 421-218-63188 http://iapc.chemie.uni-bremen.de
    • Arne Wittstock, Lawrence Livermore National Laboratory, Nanoscale Synthesis and Characterization Laboratory, 7000 East Avenue, CA 94550 (USA)

      Marcus Bäumer, Centre for Environmental Research and Sustainable Technology, Institute of Applied and Physical Chemistry, University Bremen, Leobener Strasse NW2, 28359 Bremen (Germany), Fax: (+49) 421-218-63188 http://iapc.chemie.uni-bremen.de

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Abstract

Oxidation catalysis by gold spurred intensive research efforts over the last two decades, which is encouraged by the unparalleled activity at temperatures even below 0 °C. Yet, gold nanostructures are inherently prone to coalescence at elevated temperatures, which limits their application. We demonstrate that this impediment can be overcome by reversing the classical order, that is, by depositing oxide nanoparticles on a high-surface area gold support. We used atomic layer deposition and liquid phase deposition, which leads to densely arranged oxide nanoparticles on the surface of a nanoporous gold material. In the case of a titania-coated material, a catalyst with so far unprecedented high catalytic activity already at ambient temperatures and stability up to 600 °C could be obtained. We demonstrate its high catalytic potential for two important reactions in the context of exhaust gas treatment: the oxidation of CO and the reduction of NO already proceeding at ambient temperatures.

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