Electrochemical promotion of NO reduction by propene on Pt/YSZ

B. Béguin (1) , F. Gaillard (1) , M. Primet (1) , Philippe Vernoux (1) , Laurence Bultel (2) , Marc Hénault (2) , Claude Roux (2) , Elisabeth Siebert (2)

1 LACE - Laboratoire d'Application de la Chimie à l'Environnement
2 LEPMI - Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces

The reduction of NO by C₃H₆ in the presence of oxygen, is of great environmental importance. Platinum-based catalysts are very active but not selective towards N₂ production and mainly convert NO into N₂O, which participates to the greenhouse effect. Moreover, their operating temperature window is quite narrow. Electrochemical promotion was used to improve platinum catalytic behaviour. Platinum was deposited on YSZ (Y₂O₃ — stabilised ZrO₂), an O²-conductor. It was found that a negative current increased the rate of NO reduction and CO₂ formation. This rate enhancement was non-Faradaic with an apparent Faradaic efficiency (Λ) close to 180 indicating the manifestation of a NEMCA effect. However, the current application had no effect on the N₂ selectivity

Domaines: Matériaux

B. Béguin, F. Gaillard, M. Primet, Philippe Vernoux, Laurence Bultel, et al.. Electrochemical promotion of NO reduction by propene on Pt/YSZ. Ionics, 2002, 8 (1-2), pp. 128-135. ⟨10.1007/BF02377763⟩. ⟨hal-00418096⟩