Abstract
The Pt/yttria-stabilized cubic zirconia (YSZ) interface exposed to a reactive gas was characterised by solid electrolyte potentiometry and cyclic voltammetry. The catalytic reactions included total combustion of C 3H 8 and C 3H 6 to CO 2 and H 2O as well as NO reduction by C 3H 6 in the presence of O 2 under oxygen-rich and stoichiometric conditions. The solid electrolyte potentiometry as a function of the temperature in C 3H x /O 2 (with x=6 or 8) reflected the catalytic properties of Pt for C 3H x oxidation. In C 3H 6/NO/O 2, the reduction of NO was evidenced below 300 °C. The cyclic voltammetry evidenced the formation of an oxygen chemisorbed layer on the Pt surface under anodic potential. Propane had no effect on this chemisorbed layer, whereas propene weakened significantly the strength of this Pt–O bond. Addition of NO to C 3H 6/O 2 led to the disappearing of this chemisorbed layer. The use of solid electrolyte potentiometry in conjunction with cyclic voltammetry allowed us to determine the surface oxidation state of Pt during the catalytic reactions.
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