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The Electrical Properties of NOx-storing Carbonates during NOx exposure

Title data

Groß, Andrea ; Bishop, Sean R. ; Yang, Dae Jin ; Truller, Harry L. ; Moos, Ralf:
The Electrical Properties of NOx-storing Carbonates during NOx exposure.
In: Solid State Ionics. Vol. 225 (2012) . - pp. 317-323.
ISSN 0167-2738
DOI: https://doi.org/10.1016/j.ssi.2012.05.009

Official URL: Volltext

Project information

Project title:
Project's official titleProject's id
No informationMO 1060/9-1

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

In order to gain a deeper understanding of the different components in multi-component automotive catalyst systems and integrating type NOx-sensors, in-situ electrical methods are examined. The conductivity of BaCO3 and K2CO3, key components in automotive NOx storage catalysts, was examined as a function of gas composition and temperature. Impedance measurements performed on BaCO3, K2CO3, and equimolar mixtures of both, demonstrated that, in all cases, the resistance decreases in the presence of NO2 gas with progressive NOx sorption on the carbonate surface. Mixing the hygroscopic but low resistivity K2CO3 with the very highly resistive but stable BaCO3 resulted in greater stability than K2CO3 alone, as well as improved ability to measure resistivity changes. The resistance of the mixture recovered about 50% of its value after removing NO2 from the gas stream, believed to result from migration of sorbed NOx from K to Ba, instead of desorption alone. These results on NOx trap materials show that in-situ impedance spectroscopy measurements offer real-time characterization of NOx loading levels in lean NOx trap catalyst components.

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
Faculties
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 19 Jan 2015 11:24
Last Modified: 14 Apr 2016 06:49
URI: https://eref.uni-bayreuth.de/id/eprint/5590