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The model oxidation catalyst α-V2O5: insights from contactless in situ microwave permittivity and conductivity measurements

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Abstract

The in situ microwave cavity perturbation technique was used to study the complex permittivity and conductivity of polycrystalline α-V2O5 in a tubular reactor under reactive high-temperature conditions with a TM110 cavity resonating at 9.2 GHz. The sample was investigated at 400 °C in flowing air and air/n-butane mixtures while simultaneously measuring the total oxidation products CO and CO2 by gas chromatography. The V2O5 powder was identified as an n-type semiconductor and the dynamic microwave conductivity correlated well with the near-infrared (NIR) absorption assigned to V3d1 band gap states. Correlations between catalytic performance, real and imaginary parts of the permittivity, and NIR absorption allowed the differentiation between bulk and surface contributions to the charge transport in reactive atmospheres. The stability of the crystalline bulk phase was proven by in situ powder X-ray diffractometry for all applied testing conditions.

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Acknowledgements

The authors thank Prof. R. Stößer (HU Berlin) for his continuing support of our microwave activities. Financial support by the German Federal Ministry of Education and Research (BMBF) within the framework of the ReAlSelOx project (Fkz 033R028) and by the Deutsche Forschungsgemeinschaft (DFG) is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4–6, 14195, Berlin, Germany

    Christian Heine, Frank Girgsdies, Annette Trunschke, Robert Schlögl & Maik Eichelbaum

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  1. Christian Heine
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  2. Frank Girgsdies
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  3. Annette Trunschke
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  4. Robert Schlögl
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  5. Maik Eichelbaum
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Correspondence to Maik Eichelbaum.

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Heine, C., Girgsdies, F., Trunschke, A. et al. The model oxidation catalyst α-V2O5: insights from contactless in situ microwave permittivity and conductivity measurements. Appl. Phys. A 112, 289–296 (2013). https://doi.org/10.1007/s00339-013-7800-6

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  • DOI: https://doi.org/10.1007/s00339-013-7800-6

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