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Journal Article

Operando Electrical Conductivity and Complex Permittivity Study on Vanadia Oxidation Catalysts

MPS-Authors
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Wernbacher,  Anna Maria
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Eichelbaum,  Maik
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons104326

Cap,  Sébastien
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons22181

Trunschke,  Annette
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Heterogeneous Reactions, Max-Planck-Institute for Chemical Energy Conversion , Stiftstr. 34 - 36 45470 Mülheim an der Ruhr, Germany;

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Supplementary Material (public)

SI_MCPT-V2O5-VPP_rev.pdf
(Supplementary material), 2MB

Citation

Wernbacher, A. M., Eichelbaum, M., Risse, T., Cap, S., Trunschke, A., & Schlögl, R. (2019). Operando Electrical Conductivity and Complex Permittivity Study on Vanadia Oxidation Catalysts. The Journal of Physical Chemistry C, 123(13), 8005-8017. doi:10.1021/acs.jpcc.8b07417.


Cite as: https://hdl.handle.net/21.11116/0000-0002-7FC2-5
Abstract
The electrical conductivity and its real and imaginary permittivity parameters were studied over two vanadium-containing catalysts for the selective oxidation of n-butane to maleic anhydride. Parameter variation under isothermal conditions allowed determination of multiple steady-state conditions for catalytic performance and charge carrier dynamics. One sample was the n-type semiconductor V2O5–x with low selectivity, and the other sample was the p-type semiconductor vanadyl pyrophosphate (VPP) with high selectivity for the target product. Well-resolved conductivity parameters supported by in situ UV–vis studies allowed correlations between performance and charge carrier dynamics. A concept for interpreting the trends is presented, and consequences for further analytical work as well as for material design are derived.