Oxygen permeation, thermal and chemical expansion of La, SrFe, GaO3−δ perovskite membranesReportar como inadecuado




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1 SPCTS - Science des Procédés Céramiques et de Traitements de Surface 2 CRCD - Centre de Recherche Claude Delorme Jouy-en-Josas 3 Axe 1 : procédés céramiques SPCTS - Science des Procédés Céramiques et de Traitements de Surface

Abstract : Dense ceramic membranes made from mixed conductors are interesting because of their potential applications formethane conversion into syngas H2 and CO mixture. Such membranes need to present a low differential dimensional variation between the opposite faces submitted to a large gradient of oxygen partial pressure, in order to minimize mechanical stresses generated through the membrane thickness. Besides, high oxygen permeability is required for high methane reforming rate. La1−xSrxFe1−yGayO3−δ materials fulfil these two main requirements and were retained as membranes in catalytic membrane reactors CMR. The variations of expansion and oxygen permeation of La1−xSrxFe1−yGayO3−δ perovskite materials with the partial substitution of lanthanum and iron cations, temperature and oxygen partial pressure, were studied. For low temperatures 800 ◦C, TEC, then dimensional stability of the membrane, and oxygen permeation of La1−xSrxFe1−yGayO3−δ materials, are significantly affected by Sr content and oxygen partial pressure. Ga has a stabilisation effect on the TEC and has no influence on oxygen permeation flux. A good compromise between dimensional stability and oxygen permeation of materials was found to be La0.7Sr0.3Fe0.7Ga0.3O3−δ composition

Keywords : Catalytic membrane reactor Perovskite Thermal expansion Chemical expansion Oxygen permeability





Autor: Enrique Juste - Aurélie Julian - G. Etchegoyen - Pierre-Marie Geffroy - Thierry Chartier - N. Richet - P. Del Gallo -

Fuente: https://hal.archives-ouvertes.fr/



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