Ionically conducting supports for oxidation catalysis

P. Vernoux (1) , Tsampas M._n. , Sapountzi F.-M.

1 CARE - IRCELYON-Catalytic and Atmospheric Reactivity for the Environment

This study reports isotopical labelling experiments during propane oxidation on nanodispersed Pt nanoparticles supported either on Yttria-Stabilized Zirconia, an O2- ionic conductor, or on non-conductive ceramics (ZrO2, SiO2) showing high metallic dispersions. 18O2 Temperature-Programmed Desorption and oxygen exchange experiments have shown that YSZ lattice oxygen species continuously migrate toward the Pt surface to such an extent that the gas phase oxygen adsorption is strongly inhibited [1]. This is not the case when the Pt nanoparticles are supported on ZrO2 or SiO2, where the propane mainly reacts with gaseous oxygen. This underlines the strong impact of the YSZ oxygen species on the propane combustion mechanism. The oxygen ions containing in the support can act as predominant oxidizing species. This finding open new routes to design smart and efficient high surface specific area metal-supported catalysts for hydrocarbon oxidation reactions involved in environmental catalysis.

Domaines: Catalyse; Environnement et Société

P. Vernoux, Tsampas M._n., Sapountzi F.-M.. Ionically conducting supports for oxidation catalysis. Conference in Advances in Functional Materials, Jun 2015, New-York, United States. ⟨hal-01169413⟩