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Microwave cavity perturbation studies on ion-exchanged and H-form SCR catalyst materials : correlation of ammonia storage and dielectric properties

Titelangaben

Rauch, Dieter ; Dietrich, Markus ; Simons, Thomas ; Porch, Adrian ; Moos, Ralf:
Microwave cavity perturbation studies on ion-exchanged and H-form SCR catalyst materials : correlation of ammonia storage and dielectric properties.
2015
Veranstaltung: CAPOC10 : 10th International Congress on Catalysis and Automotive Pollution Control , 28.-30.10.2015 , Brussels, Belgien.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung , Poster )

Abstract

Ammonia-based selective catalytic reduction (SCR) has become the major control strategy for NOx emissions from light and heavy duty diesel engines. Before reducing NOx on the SCR active material, ammonia storage on the active sites of the catalyst is crucial. The in operando measurement of the dielectric properties of the catalyst material using microwave cavity perturbation is a promising indicator of ammonia loading. In this work, results on two zeolite-based SCR materials, i.e.ZSM-5 in H-form and copper ion-exchanged, are presented. The catalyst powder samples were monitored by microwave cavity perturbation as a function of ammonia content at a frequency of approximately 1.2 GHz in a temperature range between 200 and 350 °C. Due to ion exchange, the NH₃ storage behavior changes, what could be monitored in the sensitivity of the dielectric permittivity to NH₃. The dependence of the complex dielectric permittivity on ammonia loading is decreased by ion exchange, hinting that mostly ammonia storage on Brønsted sites affects the dielectric permittivity. This finding adds new knowledge to the electrical conduction and polarization mechanisms occurring in these zeolite materials.

Weitere Angaben

Publikationsform: Veranstaltungsbeitrag (Poster)
Begutachteter Beitrag: Ja
Zusätzliche Informationen: NOx control & NOx reduction, mechanisms, modelling : P030
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 > ZET - Zentrum für Energietechnik
Forschungseinrichtungen > Forschungsstellen > BERC - Bayreuth Engine Research Center
Fakultäten
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien
Profilfelder
Profilfelder > Advanced Fields
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Forschungseinrichtungen > Forschungsstellen
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Eingestellt am: 22 Dec 2015 09:06
Letzte Änderung: 18 Apr 2016 07:50
URI: https://eref.uni-bayreuth.de/id/eprint/29012