A novel approach for catalyst OBD : Comparing directly the up- and downstream atmospheres of a catalyst using a special solid electrolyte mixed-potential setup

Titelangaben

Hagen, Gunter ; Burger, Katharina ; Wiegärtner, Sven ; Schönauer-Kamin, Daniela ; Moos, Ralf:
A novel approach for catalyst OBD : Comparing directly the up- and downstream atmospheres of a catalyst using a special solid electrolyte mixed-potential setup.
2014
Veranstaltung: The 15th International Meeting on Chemical Sensors, IMCS 15 , 16.-19.03.2014 , Buenos Aires, Argentina.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung , Vortrag )

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Abstract

Automotive exhaust gas aftertreatment systems need to be monitored during operation (on-board diagnosis, OBD). The conversion of hydrocarbons and the generation of NO2 are the main functions of a diesel oxidation catalyst (DOC). To monitor the catalysts functionality, usually gas sensors are installed at least downstream of the catalysts. The here-presented work describes very first steps of a novel alternative concept. It compares the gas atmospheres up- and downstream of the catalyst directly and in operando within one single device rather than measuring two separate gas concentrations at different locations. In the final setup, a sensor device would consist of a small pipe (as it is in-use in differential pressure sensors of today’s diesel particulate filters) and a setup that allows comparing both atmospheres directly. However, to prove this concept at an initial stage, a more complex laboratory setup was selected.