bei Google ScholarTitelangaben
Moos, Ralf ; Rauch, Dieter ; Votsmeier, Martin ; Kubinski, David J.:
Radio frequency based monitoring of SCR and three way catalysts - a novel tool to get insight into catalyst behavior : Update on recent advances.
2015
Veranstaltung: CAPoC10 - 10th International Congress on Catalysis and Automotive Pollution Control
, 28.-30.10.2015
, Brussels, Belgium.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung
,
Vortrag
)
Angaben zu Projekten
| Projekttitel: |
Offizieller Projekttitel Projekt-ID Ohne Angabe Mo 1060/19-1 Ohne Angabe Mo 1060/13-1 |
|---|---|
| Projektfinanzierung: |
Deutsche Forschungsgemeinschaft |
Abstract
Knowledge of the actual catalyst state plays a key role in automotive exhaust gas aftertreatment. The oxygen loading degree of three-way catalysts (TWC), the amount of stored ammonia in SCR catalysts, or the NOx loading degree in NSCs are important parameters. Today, they are determined indirectly and/or model-based, applying models that are typically calibrated by gas sensors installed up- and/or downstream of the catalysts. A novel approach to determine directly the catalyst state by microwaves (radio frequencies, rf) emerged recently. For this method, the catalyst housing serves as an electrical cavity resonator. As “sensor”, one or two simple antennas are mounted in the canning. The electrical properties of the honeycomb incl. coating change with gas loading, affecting either the resonance frequencies or the power transmission. Such contactlessobtained information is strongly correlated with the catalyst state as will be discussed here for TWC and SCR systems. While initial studies were overviewed during past CAPoC in 2012, this contribution reviews the enormous progress in the past 3 years.