Improvement of the NOx selectivity for a planar YSZ sensor

Jing Gao (1, 2, 3) , Jean-Paul Viricelle (1, 2, 3) , Christophe Pijolat (1, 2, 3) , Philippe Breuil (1, 2, 3) , Philippe Vernoux (4) , Antoinette Boreave (4) , Anne Giroir-Fendler (4)

1 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels
2 LPMG-EMSE - Laboratoire des Procédés en Milieux Granulaires
3 PRESSIC-ENSMSE - Procédés et REactivité des Systèmes Solide-gaz, Instrumentation et Capteurs
4 IRCELYON - Institut de recherches sur la catalyse et l'environnement de Lyon

In recent years planar yttria-stabilized zirconia (YSZ) based electrochemical gas sensors for automotive exhaust applications have become a major source of interest. The present work aims to develop a sensor for industrialisation. For this reason planar YSZ-based electrochemical sensors using two metallic electrodes (platinum and gold) were fabricated using screen-printing technology and tested in a laboratory test bench for different concentrations of pollutant gas such as CO, NO, NO2 and hydrocarbons in oxygen rich atmosphere. It was furthermore shown that the selectivity towards NOx could be highly reinforced by deposing a catalytic filter consisting of 1.7-4.5 wt.% Pt dispersed on alumina directly on the sensing elements. This filter was characterized by the use of SEM, TPD and XRD.

Mots clés: Electrochemical gas sensor; NOx sensor; Catalytic filter; NOx selectivity; Automotive exhaust

Domaines: Génie des procédés

Jing Gao, Jean-Paul Viricelle, Christophe Pijolat, Philippe Breuil, Philippe Vernoux, et al.. Improvement of the NOx selectivity for a planar YSZ sensor. Sensors and Actuators B: Chemical, 2011, 154 (2), pp.106-110. ⟨10.1016/j.snb.2010.01.033⟩. ⟨hal-00590817⟩