A microwave-based method to monitor the ammonia loading of a vanadia doped tungsten-titania SCR catalyst

Titelangaben

Rauch, Dieter ; Albrecht, Gaby ; Kubinski, David J. ; Moos, Ralf:
A microwave-based method to monitor the ammonia loading of a vanadia doped tungsten-titania SCR catalyst.
2014
Veranstaltung: The 15th International Meeting on Chemical Sensors, IMCS 15 , 16.-19.03.2014 , Buenos Aires, Argentina.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung , Sonstige Präsentationstyp)

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Abstract

Nitrogen oxides are major emissions of lean burn combustion engines. For emission control, selective catalytic reduction exhaust gas aftertreatment systems are applied. Ammonia serves as the reducing agent and vanadia doped tungsten–titania is widely used as the catalyst material. Before the reduction of NOx can proceed, ammonia has to be adsorbed on the catalyst. Thereby, the conductivity of the catalyst material increases, which can be detected by microwaves excited in the catalyst housing. Using the technique presented in this work allows for determining the ammonia loading directly and in-situ.