Detection of the ammonia loading of a zeolite SCR-catalyst by a radio frequency-based method

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Rauch, Dieter ; Kubinski, David J. ; Simon, Ulrich ; Moos, Ralf:
Detection of the ammonia loading of a zeolite SCR-catalyst by a radio frequency-based method.
2014
Event: The 15th International Meeting on Chemical Sensors, IMCS 15 , 16.-19.03.2014 , Buenos Aires, Argentina.
(Conference item: Conference , Other Presentation type)

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Zeolites are in use as catalyst materials in the selective catalytic reduction of NOx with NH3 as reducing agent. An initial NH3-adsorption on the catalyst is essential for the reaction with NO and NO2 to occur. Due to the adsorbed NH3, the proton conductivity of the zeolite increases markedly. As shown in this work, this change of the electrical properties of the catalyst material can be monitored in a contactless way and in-operando using a radio frequency-based method. Therein, the metallic catalyst housing serves as cavity resonator in which microwaves are excited. The electrical properties of the resonator filling affect the resonance behavior. Hence, the ammonia loading of the catalyst can be monitored directly.