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A Gas Sensing Approach to Gain Insight into the Mechanism of DeNOx-SCR over Fe-ZSM-5 Catalysts

Title data

Rizzotto, Valentina ; Chen, Peirong ; Hagen, Gunter ; Moos, Ralf ; Simon, Ulrich:
A Gas Sensing Approach to Gain Insight into the Mechanism of DeNOx-SCR over Fe-ZSM-5 Catalysts.
In: 17th International Meeting on Chemical Sensors - IMCS 2018. - Wien , 2018 . - pp. 134-135
ISBN 978-3-9816876-9-9
DOI: https://doi.org/10.5162/IMCS2018/GS3.5

Official URL: Volltext

Abstract in another language

In order to meet the legislative emission requirements for NOx emission, selective catalytic reduction (DeNOx-SCR) catalysts, in particular zeolites, are used. To improve their catalytic performance, an in-depth understanding of the reaction mechanisms is required based on an analysis of the physicochemical properties, preferably in situ. We introduce a setup combining impedance spectroscopy (IS) and infrared spectroscopy in diffuse reflection mode (DRIFT) for in situ measurements on zeolites under SCR-related conditions. By means of this gas sensing approach, we observed the formation of ammonium ion (NH4+) intermediates resulting from the interaction of NO and NH3 on Fe-ZSM-5 catalysts. The formed NH4+ intermediates, indicating the activation of NO in the presence of adsorbed NH3, were found to correlate to the NH3−SCR activity of Fe-ZSM-5 catalysts at low temperatures. These findings, which are not easily achievable by conventional methods, provide new and important perspectives to understand mechanistically the NH3−SCR reaction over Fe-zeolite catalysts.

Further data

Item Type: Article in a book
Refereed: Yes
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: 23 Jul 2018 07:00
Last Modified: 23 Jul 2018 07:00
URI: https://eref.uni-bayreuth.de/id/eprint/45154