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Impedance measurements in catalysis: charge transfer in titania supported noble metal catalysts

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Hydrogen treatment of Pt/TiO2 leads to an exceptional increase in electric conductivity even at moderate temperature presumably due to the formation of donor electrons during a superficial reduction process. Interestingly, after cooling to lower temperatures that are typically applied for catalytic reactions the observed high conductivity was largely preserved. The enhanced charge carrier density in titania is assumed to cause a considerable charge transfer between support and metal. In this work we show that this charge transfer is correlated with typical catalytic parameters (e.g. hydrogen adsorption capacity and catalytic activity for a hydrocarbon skeleton reaction). Based on these observations we suggest and discuss a modified charge transfer mechanism in addition to the decoration mechanism as a possible reason for the SMSI effect occurring during hydrogen treatment already at moderate temperatures.

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Authors and Affiliations

  1. Institut für Physikalische Chemie, Universität Innsbruck, 6020, Innsbruck, Austria

    Wilfrid Jochum, Gernot Kaltenhauser & Reinhard Kramer

  2. Department of Materials Science and Metallurgy, University of Cambridge, New Museums Site, Pembroke Street, Cambridge, CB2 3QZ, United Kingdom

    Dominik Eder

Authors
  1. Wilfrid Jochum
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  2. Dominik Eder
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  3. Gernot Kaltenhauser
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  4. Reinhard Kramer
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Correspondence to Reinhard Kramer.

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Dedicated to Konrad Hayek.

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Jochum, W., Eder, D., Kaltenhauser, G. et al. Impedance measurements in catalysis: charge transfer in titania supported noble metal catalysts. Top Catal 46, 49–55 (2007). https://doi.org/10.1007/s11244-007-0314-8

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