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Operando Electrical Conductivity and Complex Permittivity Study on Vanadia Oxidation Catalysts

MPG-Autoren
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Schlögl,  Robert
Research Department Schlögl, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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Zitation

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. SI, 123(13), 8005-8017. doi:10.1021/acs.jpcc.8b07417.


Zitierlink: https://hdl.handle.net/21.11116/0000-0006-794F-B
Zusammenfassung
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.