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Sensing Catalytic Conversion : Simultaneous DRIFT and Impedance Spectroscopy for in situ Monitoring of NH3–SCR on Zeolites

Title data

Simons, Thomas ; Chen, Peirong ; Rauch, Dieter ; Moos, Ralf ; Simon, Ulrich:
Sensing Catalytic Conversion : Simultaneous DRIFT and Impedance Spectroscopy for in situ Monitoring of NH3–SCR on Zeolites.
In: Sensors and Actuators B: Chemical. Vol. 224 (2016) . - pp. 492-499.
ISSN 0925-4005
DOI: https://doi.org/10.1016/j.snb.2015.10.069

Official URL: Volltext

Project information

Project title:
Project's official titleProject's id
No informationMo 1060/19-1
No informationSi609/14-1

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

In order to meet the legislative emission requirements for NOx-containing exhaust gases, SCR catalysts, in particular zeolites, are used. To improve catalysts and the catalytic processes, an in-depth understanding of the reaction mechanisms is required as well as an analysis of the physicochemical properties of the SCR catalysts, preferably in real-time. Here, we introduce a setup combining impedance spectroscopy and infrared spectroscopy in diffuse reflection mode for in situ measurements on zeolites under SCR-related conditions. This setup allows for the first time to simultaneously monitor both, the proton conductivity of zeolites and the vibration modes of the molecules involved in the catalytic conversion of NO by NH3. We studied both, pure and Fe-promoted H-form zeolites, as sensors and model catalysts at the same time, and found out that weakly bound NH3 is dominating the proton conductivity of both zeolites in a temperature range below the desorption temperature of NH3. When a part of the weakly bound NH3 is consumed by the SCR reaction, proton conductivity and thus the sensing effect gets dominated by strongly bound NH3. This allows applying impedance spectroscopy to assess the degree of NH3 loading and the state of the SCR conversion process in zeolite catalyst.

Further data

Item Type: Article in a journal
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 > 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: 18 Jan 2016 08:18
Last Modified: 18 Apr 2016 07:55
URI: https://eref.uni-bayreuth.de/id/eprint/29717