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Monitoring the ammonia loading of zeolite-based ammonia SCR catalysts by a microwave method

Title data

Reiß, Sebastian ; Schönauer-Kamin, Daniela ; Hagen, Gunter ; Fischerauer, Gerhard ; Moos, Ralf:
Monitoring the ammonia loading of zeolite-based ammonia SCR catalysts by a microwave method.
In: Chemical Engineering & Technology. Vol. 34 (2011) Issue 5 . - pp. 791-796.
ISSN 1521-4125
DOI: https://doi.org/10.1002/ceat.201000546

Official URL: Volltext

Project information

Project title:
Project's official titleProject's id
No informationMo 1060/6-1
No informationFi956/3-1

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Exhaust gas aftertreatment systems, which reduce nitrogen oxide emissions of heavy-duty diesel engines, commonly use a selective catalytic reduction (SCR) catalyst. Currently, emissions are controlled by evaluating NOx or NH3 in the gas phase downstream the catalyst and calculating the NH3 loading via a chemical storage model. Here, a microwave-cavity perturbation method is proposed in which electromagnetic waves are excited by probe feeds and the reflected signals are measured. At distinct resonance frequencies, the reflection coefficient shows a pronounced minimum. These resonance frequencies depend almost linearly on the NH3 loading of a zeolite-based SCR catalyst. Since the NH3 loading-dependent electrical properties of the catalyst material itself are measured, the amount of stored ammonia can be determined directly and in situ. The cross-sensitivity towards water can be reduced almost completely by selecting an appropriate frequency range.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Measurement and Control Technology
Faculties > Faculty of Engineering Science > Chair Measurement and Control Technology > Chair Measurement and Control Technology - Univ.-Prof. Dr.-Ing. Gerhard Fischerauer
Faculties > Faculty of Engineering Science > Chair Functional Materials
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields
Profile Fields > Advanced Fields
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Research Institutions > Research Units
Research Institutions > Research Units > BERC - Bayreuth Engine Research Center
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 19 Jan 2015 08:18
Last Modified: 24 Feb 2016 07:09
URI: https://eref.uni-bayreuth.de/id/eprint/5610