Remarkable Enhancement of O2 Activation on Yttrium‐Stabilized Zirconia Surface in a Dual Catalyst Bed |
| |
| Authors: | Mélissandre Richard Dr Fabien Can Dr Daniel Duprez Dr Sonia Gil Prof?Dr Anne Giroir‐Fendler Dr Nicolas Bion |
| |
| Institution: | 1. University of Poitiers, CNRS, UMR 7285, Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), 4 rue Michel Brunet—TSA 51106–86073 Cedex 9 (France);2. Université Lyon 1, CNRS, UMR 5256, Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), 2 avenue Albert Einstein, 69626 Villeurbanne (France) |
| |
| Abstract: | Yttrium‐stabilized zirconia (YSZ) has been extensively studied as an electrolyte material for solid oxide fuel cells (SOFC) but its performance in heterogeneous catalysis is also the object of a growing number of publications. In both applications, oxygen activation on the YSZ surface remains the step that hinders utilization at moderate temperature. It was demonstrated by oxygen isotope exchange that a dual catalyst bed system consisting of two successive LaMnO3 and YSZ beds without intimate contact drastically enhances oxygen activation on the YSZ surface at 698 K. It can be concluded that LaMnO3 activates the triplet ground‐state of molecular oxygen into a low‐lying singlet state, thereby facilitating the activation of the O2 molecule on the YSZ oxygen vacancy sites. This phenomenon is shown to improve the catalytic activity of the LaMnO3‐Pd/YSZ system for the partial oxidation of methane. |
| |
| Keywords: | methane oxidation oxygen exchange singlet oxygen yttrium‐stabilized zirconia |
|
|
