Selective Mixed Potential Ammonia Exhaust Gas Sensor

Titelangaben

Schönauer-Kamin, Daniela ; Moos, Ralf ; Fleischer, Maximilian ; Wiesner, Kerstin:
Selective Mixed Potential Ammonia Exhaust Gas Sensor.
2008
Veranstaltung: The 12th International Meeting on Chemical Sensors, IMCS 12 , 13.-16.06.2008 , Columbus, Ohio, USA.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung , Sonstige Präsentationstyp)

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Abstract

The present work describes a novel selective NH3 sensor principle with a high potential for longterm stability in harsh exhaust environments. The sensor is based on the well-known mixed potential effect. In contrast to common sensors, the electrode functionalities electrical conductivity and selective catalytic activity combined with long-term stability are separated. Therefore, one of the two electrodes is covered by a well-known porous SCR catalyst material, which has been developed for exhaust gas SCR applications. Two SCR coatings (Fe-ZSM5 and vanadia-tungsten oxide-titania) are investigated. The resulting sensor signal depends semi-logarithmically on ammonia. The NO cross-sensitivity is marginal.