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

Title data

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
Event: CAPOC10 : 10th International Congress on Catalysis and Automotive Pollution Control , 28.-30.10.2015 , Brussels, Belgien.
(Conference item: Conference , Poster )

Abstract in another language

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.

Further data

Item Type: Conference item (Poster)
Refereed: Yes
Additional notes: NOx control & NOx reduction, mechanisms, modelling : P030
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Research Institutions > Research Units > ZET - Zentrum für Energietechnik
Research Institutions > Research Units > BERC - Bayreuth Engine Research Center
Faculties
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Units
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 22 Dec 2015 09:06
Last Modified: 18 Apr 2016 07:50
URI: https://eref.uni-bayreuth.de/id/eprint/29012