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Radio-frequency-based determination of the oxygen and the NOx storage level of NOx storage catalysts


Walter, Stefanie ; Ruwisch, Lutz ; Göbel, Ulrich ; Hagen, Gunter ; Moos, Ralf:
Radio-frequency-based determination of the oxygen and the NOx storage level of NOx storage catalysts.
Veranstaltung: CAPOC11 - 11th International Congress on Catalysis and Automotive Pollution Control , Oct. 29 - 31, 2018 , Brussels, Belgium.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung , Poster )


In recent years, research on microwave-based catalyst state diagnosis for diesel engines has focused mainly on SCR systems. To increase the efficiency of exhaust aftertreatment systems, SCR catalysts can be combined with NOx storage catalysts (NSC). For optimum performance, the degree of loading of the storage components has to be monitored. Up to now, in commercial application this has been done indirectly by using mathematical models. In this paper the opportunities of a simple radio frequency (RF) based method for a direct determination are highlighted. Therefore, a commercial NSC was investigated between 210 and 390 °C. A linear dependence between the RF signals and the stored amount of NO was found. Furthermore, the RF parameters are not directly affect by the NO or oxygen concentration, but only indirectly by amount of stored NO, which depends on the NO concentration. By evaluating multiple signals, which are based on different material effects, a separate determination of the oxygen and NOx storage level could be realized.

Weitere Angaben

Publikationsform: Veranstaltungsbeitrag (Poster)
Begutachteter Beitrag: Ja
Institutionen der Universität: Fakultäten > Fakultät für Ingenieurwissenschaften
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien > Lehrstuhl Funktionsmaterialien - Univ.-Prof. Dr.-Ing. Ralf Moos
Profilfelder > Advanced Fields > Neue Materialien
Forschungseinrichtungen > Forschungszentren > Bayreuther Materialzentrum - BayMAT
Forschungseinrichtungen > Forschungsstellen > BERC - Bayreuth Engine Research Center
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien
Profilfelder > Advanced Fields
Forschungseinrichtungen > Forschungszentren
Forschungseinrichtungen > Forschungsstellen
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Eingestellt am: 07 Nov 2018 12:47
Letzte Änderung: 07 Nov 2018 12:47
URI: https://eref.uni-bayreuth.de/id/eprint/46243