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Remarkable Enhancement of O 2 Activation on Yttrium‐Stabilized Zirconia Surface in a Dual Catalyst Bed
Author(s) -
Richard Mélissandre,
Can Fabien,
Duprez Daniel,
Gil Sonia,
GiroirFendler Anne,
Bion Nicolas
Publication year - 2014
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201403921
Subject(s) - yttria stabilized zirconia , catalysis , cubic zirconia , materials science , oxygen , yttrium , oxide , chemical engineering , singlet oxygen , electrolyte , inorganic chemistry , chemistry , composite material , electrode , organic chemistry , metallurgy , ceramic , engineering
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 LaMnO 3 and YSZ beds without intimate contact drastically enhances oxygen activation on the YSZ surface at 698 K. It can be concluded that LaMnO 3 activates the triplet ground‐state of molecular oxygen into a low‐lying singlet state, thereby facilitating the activation of the O 2 molecule on the YSZ oxygen vacancy sites. This phenomenon is shown to improve the catalytic activity of the LaMnO 3 ‐Pd/YSZ system for the partial oxidation of methane.