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Monitoring of Electrochemical Processes in Catalysts by Microwave Methods

Title data

Fischerauer, Gerhard ; Gollwitzer, Andreas ; Nerowski, Alexander ; Spörl, Matthias ; Reiß, Sebastian ; Moos, Ralf:
Monitoring of Electrochemical Processes in Catalysts by Microwave Methods.
In: Lindenmeier, Stefan ; Weigel, Robert (ed.): Electromagnetics and network theory and their microwave technology applications : a tribute to Peter Russer. - Berlin : Springer , 2011 . - pp. 119-132
ISBN 978-3-642-18374-4
DOI: https://doi.org/10.1007/978-3-642-18375-1_9

Abstract in another language

Modern vehicles driven by a gasoline engine make use of the three-way catalyst (TWC) to eliminate noxious gas components like CO, HC or NOx from the exhaust gas. Such a catalyst consists of a dielectric honeycomb-like matrix coated with an oxygen-storing component such as ceria (an n-type semiconductor) and possibly a catalytically active noble metal such as platinum. The efficient removal of noxious gases calls for a normalized air-to-fuel ratio lambda of one. This cannot be achieved in practice, but by running the engine alternately in lean mode (more air than needed for complete combustion; lambda > 1 ) and in rich mode (more fuel than needed for complete combustion; lambda < 1) at least the time average of lambda can be made to take on the desired value of one. Under proper working conditions, the amplitude of the oscillations in lambda is much smaller downstream of the catalyst than upstream. [...]

Further data

Item Type: Article in a book
Refereed: No
Additional notes: Kapitel 9 des Buches.
Keywords: Three-way catalyst; TWC; microwave cavity resonator; resonance frequency; perturbation; S-parameters; measurement; state estimation; in situ; cableless
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Measurement and Control Technology > Chair Measurement and Control Technology - Univ.-Prof. Dr.-Ing. Gerhard Fischerauer
Faculties
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Measurement and Control Technology
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 29 Feb 2016 13:46
Last Modified: 29 Feb 2016 13:46
URI: https://eref.uni-bayreuth.de/id/eprint/31223