Development of a sensitive and selective mixed-potential ammonia sensor for automotive exhausts

Gita Nematbakhsh Abkenar (1, 2) , Jean-Paul Viricelle (1, 2) , Mathilde Rieu (1, 2) , Philippe Breuil (1, 2)

1 PTSI-ENSMSE - Département Procédés de Transformations des Solides et Instrumentation
2 LGF-ENSMSE - Laboratoire Georges Friedel

Selective catalyst reduction (SCR) system using ammonia gas as a reductant, is one the most reliable ways to control NO_x emissions from diesel engine vehicles and trucks. In order to optimize the conversion rates of NO_x and to prevent inducing excessive NH₃ to the air, an NH₃ sensor is required to control the SCR system for maintaining NH₃ slip at an acceptable level. In this study, a highly selective ammonia sensor was developed to detect ammonia emissions from automotive exhaust. The effects of operating temperature and electrode composition on NH₃ response were investigated. The results indicate that the selectivity and stability of sensors are extremely dependent on previous parameters. These sensors also show remarkable sensing properties even for low concentrations of ammonia with logarithmic dependence on the gas concentration.

Mots clés: Ammonia; Mixed-potential sensors; Selectivity; Vanadium oxide; Gas sensor

Domaines: Génie des procédés

Gita Nematbakhsh Abkenar, Jean-Paul Viricelle, Mathilde Rieu, Philippe Breuil. Development of a sensitive and selective mixed-potential ammonia sensor for automotive exhausts. Fifth International Conference on Sensors and Electronic Instrumentation Advances (SEIA' 2019), International Frequency Sensor Association (IFSA), Sep 2019, Canary Islands (tenerife), Spain. ⟨hal-02325772⟩