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Monitoring NH3 storage and conversion in Cu-ZSM-5 and Cu-SAPO-34 catalysts for NH3-SCR by simultaneous impedance and DRIFT spectroscopy

Title data

Chen, Peirong ; Simböck, Johannes ; Schönebaum, Simon ; Rauch, Dieter ; Simons, Thomas ; Palkovits, Regina ; Moos, Ralf ; Simon, Ulrich:
Monitoring NH3 storage and conversion in Cu-ZSM-5 and Cu-SAPO-34 catalysts for NH3-SCR by simultaneous impedance and DRIFT spectroscopy.
Universität Bayreuth / Lehrstuhl für Funktionsmaterialien
In: Sensors and Actuators B: Chemical. Vol. 236 (2016) . - pp. 1075-1082.
ISSN 0925-4005
DOI: https://doi.org/10.1016/j.snb.2016.05.164

Official URL: Volltext

Project information

Project title:
Project's official titleProject's id
No informationMo 1060/19-1
No informationSi 609/14-1

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

The development of more efficient zeolite catalysts for selective catalytic reduction of NOx by NH3 (NH3-SCR) requires insights into both reaction mechanism and real-time state of the catalyst (e.g., the storage level of NH3). Here, we show that impedance spectroscopy (IS) can be applied to sense electrically the uptake of NH3 into proton-conducting, copper-promoted zeolite catalysts, i.e., into Cu-ZSM-5 and Cu-SAPO-34. Comparative investigations indicate that Cu-SAPO-34, as compared to Cu-ZSM-5, showed high sensitivity to the change of NH3 concentration at a broader temperature range. While both zeolites performed similarly for direct monitoring of the SCR conversion of stored NH3 at temperatures above 350 °C, Cu-SAPO-34 showed a better performance than Cu-ZSM-5 at lower temperatures. A simultaneous IS and diffuse reflection infrared Fourier transform spectroscopy (IS-DRIFTS) study revealed that NH4+ or NH4NO3 intermediates form on the two zeolite catalysts under SCR-related conditions and affect the proton conductivity at low temperatures, thus influencing significantly the monitoring of SCR conversion of stored NH3. The correlation of integral electrical responses with molecular processes, achieved by our simultaneous IS-DRIFTS studies, not only clarifies the origin of the sensing mechanism of zeolite catalysts at a molecular level, but also provides a new perspective to understand the NH3-SCR mechanism over metal-promoted zeolites at low reaction temperatures.

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
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: 29 Aug 2016 06:24
Last Modified: 29 Aug 2016 06:24
URI: https://eref.uni-bayreuth.de/id/eprint/34601