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Développement de membranes céramiques à architecture optimisée pour l'oxycombustion

Abstract : Since few years, the study of mixed conducting materials (ionic and electronic) knows an increasing interest in the energy area, especially with the development of electrodes for Solid Oxide Fuel Cell (SOFC) or Catalytic Membrane Reactors (CMR) for the methane reforming in synthesis gas or for oxyfuel process. In this latter case, the mixed conductor membrane with La1-xAxFe1-yByO3- perovskite structure allows the separation of oxygen from air at high temperature (900°C) with a quasi-infinite selectivity without outside electric circuit, with an interesting economical cost. The oxygen transport mechanisms through the membrane are studied thanks to an original electrodes system composed of a zirconia point micro-electrode and a metallic reference electrode. This system allows the measurement of the oxygen electrochemical potential at the membrane surface. The influence of cation substitution in A-site then B-site in La0.5A0.5Fe0.7B0.3O3-(A = Ca, Sr, Ba and B = Al, Co, Cu, Ga, Mg, Mn, Ni, Sn, Ti, Zn) perovskite materials has been studied. The results obtained by this original system led us to a better understanding and a identification of the rate determining step of oxygen transport mechanism through the membrane. The influence of the microstructure on oxygen semi-permeation has been studied and an evolution model of semi-permeation properties with microstructure has been shown. The understanding of oxygen transport mechanisms led to the development and the elaboration of news architectures of membranes.
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Submitted on : Monday, January 6, 2020 - 12:34:08 PM
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  • HAL Id : tel-02428950, version 1

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Mickaël Reichmann. Développement de membranes céramiques à architecture optimisée pour l'oxycombustion. Matériaux. Université de Limoges, 2014. Français. ⟨NNT : 2014LIMO0029⟩. ⟨tel-02428950⟩

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