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The effect of stored ammonia on the complex dielectric permittivity of H-ZSM-5 zeolites with varying storage site density was observed between 200 and 300 °C under reaction conditions by microwave cavity perturbation. Polarization and dielectric losses were differently affected. The sensitivity of the polarization to stored ammonia is almost independent, the sensitivity of the dielectric losses strongly dependent on the storage site density. The results can be explained by proton hopping.
Articles | Volume 4, issue 2
J. Sens. Sens. Syst., 4, 263–269, 2015
https://doi.org/10.5194/jsss-4-263-2015

Special issue: Sensor/IRS2 2015

J. Sens. Sens. Syst., 4, 263–269, 2015
https://doi.org/10.5194/jsss-4-263-2015

Regular research article 17 Aug 2015

Regular research article | 17 Aug 2015

Ammonia storage studies on H-ZSM-5 zeolites by microwave cavity perturbation: correlation of dielectric properties with ammonia storage

M. Dietrich et al.

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Beulertz, G., Herbst, F., Hagen, G., Fritsch, M., Gieshoff, J., and Moos, R.: Microwave Cavity Perturbation as a Tool for Laboratory In Situ Measurements of the Oxidation State of Three Way Catalysts, Top. Catal., 56, 405–409, https://doi.org/10.1007/s11244-013-9987-3, 2013.
Di Iorio, J. R., Ribeiro, F. H., Bates, S. A., Verma, A. A., Miller, J. T., and Gounder, R.: The Dynamic Nature of Brønsted Acid Sites in Cu–Zeolites During NOx Selective Catalytic Reduction: Quantification by Gas-Phase Ammonia Titration, Top. Catal., 58, 424–434, https://doi.org/10.1007/s11244-015-0387-8, 2015.
Dietrich, M., Rauch, D., Porch, A., and Moos, R.: A laboratory test setup for in situ measurements of the dielectric properties of catalyst powder samples under reaction conditions by microwave cavity perturbation: set up and initial tests, Sensors, 14, 16856–16868, https://doi.org/10.3390/s140916856, 2014.
Feulner, M., Hagen, G., Moos, R., Piontkowski, A., Müller, A., Fischerauer, G., and Brüggemann, D.: In-Operation Monitoring of the Soot Load of Diesel Particulate Filters: Initial Tests, Top. Catal., 56, 483–488, https://doi.org/10.1007/s11244-013-0002-9, 2013.
Franke, M. and Simon, U.: Proton mobility in H-ZSM5 studied by impedance spectroscopy, Solid State Ionics, 118, 311–316, https://doi.org/10.1016/S0167-2738(98)00436-6, 1999.

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Short summary
The effect of stored ammonia on the complex dielectric permittivity of H-ZSM-5 zeolites with varying storage site density was observed between 200 and 300 °C under reaction conditions by microwave cavity perturbation. Polarization and dielectric losses were differently affected. The sensitivity of the polarization to stored ammonia is almost independent, the sensitivity of the dielectric losses strongly dependent on the storage site density. The results can be explained by proton hopping.
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