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Preparation and oxygen permeation properties of highly asymmetric La0.6Sr0.4Co0.2Fe0.8O3-a perovskite hollow-fiber membranes / Zhigang Wang in Industrial & engineering chemistry research, Vol. 48 N°1 (Janvier 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - P. 510-516 Titre : Preparation and oxygen permeation properties of highly asymmetric La0.6Sr0.4Co0.2Fe0.8O3-a perovskite hollow-fiber membranes Type de document : texte imprimé Auteurs : Zhigang Wang, Editeur scientifique ; Naitao Yang, Editeur scientifique ; Bo Meng, Editeur scientifique Année de publication : 2009 Article en page(s) : P. 510-516 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Oxygen  Hollow  fiber  membrane Résumé : La0.6Sr0.4Co0.2Fe0.8O3−α (LSCF) perovskite powders having a submicrometer size were synthesized by a sol−gel autocombustion method. From these powders, the gastight LSCF hollow-fiber membranes with a highly asymmetric structure comprising a dense layer of thickness ca. 88 μm integrated with a porous substrate were fabricated in a single step through a phase inversion/sintering technique with a mixture of N-methyl-2-pyrrolidone (NMP) and water as internal coagulant. Oxygen permeation fluxes through the obtained hollow-fiber membranes were measured under air/He gradients at different temperatures. The results indicate that the highly asymmetric hollow-fiber membranes possess an oxygen permeation flux of 0.11−2.19 mL cm−2 min−1 in the temperature range of 650−1000 °C, which is 2.6−10.5 times higher than that of the sandwich-structured hollow-fiber membranes. Oxygen permeation in the hollow-fiber membranes is limited primarily by the surface exchange reactions at lower temperatures, but ionic bulk diffusion will have a rate-limiting effect at temperatures higher than 900 °C. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8010462 [article] Preparation and oxygen permeation properties of highly asymmetric La0.6Sr0.4Co0.2Fe0.8O3-a perovskite hollow-fiber membranes [texte imprimé] / Zhigang Wang, Editeur scientifique ; Naitao Yang, Editeur scientifique ; Bo Meng, Editeur scientifique . - 2009 . - P. 510-516. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - P. 510-516 Mots-clés : Oxygen  Hollow  fiber  membrane Résumé : La0.6Sr0.4Co0.2Fe0.8O3−α (LSCF) perovskite powders having a submicrometer size were synthesized by a sol−gel autocombustion method. From these powders, the gastight LSCF hollow-fiber membranes with a highly asymmetric structure comprising a dense layer of thickness ca. 88 μm integrated with a porous substrate were fabricated in a single step through a phase inversion/sintering technique with a mixture of N-methyl-2-pyrrolidone (NMP) and water as internal coagulant. Oxygen permeation fluxes through the obtained hollow-fiber membranes were measured under air/He gradients at different temperatures. The results indicate that the highly asymmetric hollow-fiber membranes possess an oxygen permeation flux of 0.11−2.19 mL cm−2 min−1 in the temperature range of 650−1000 °C, which is 2.6−10.5 times higher than that of the sandwich-structured hollow-fiber membranes. Oxygen permeation in the hollow-fiber membranes is limited primarily by the surface exchange reactions at lower temperatures, but ionic bulk diffusion will have a rate-limiting effect at temperatures higher than 900 °C. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8010462