The effect of intermediate layer on synthesis and gas permeation properties of NaA zeolite membrane / Nandini Das in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 3 (05/2010)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 7, N° 3 (05/2010) . - p. 383-390 Titre : The effect of intermediate layer on synthesis and gas permeation properties of NaA zeolite membrane Type de document : texte imprimé Auteurs : Nandini Das, Auteur ; Debtosh Kundu, Auteur ; Minati Chatterjee, Auteur Année de publication : 2010 Article en page(s) : p. 383-390 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces Gaz -- Séparation Revêtements:Peinture Zéolites Index. décimale : 667.9 Revêtements et enduits Résumé : NaA zeolite membrane coating was successfully synthesized on an alumina porous disc by hydrothermal treatment. The effects of synthesis parameters, such as seeding condition (in situ, ex situ), synthesis time, synthesis stages, application of intermediate layer, etc., on membrane characteristics were investigated. Surface seeding accelerates the zeolite crystallization process on the support surface, and also enhances the formation of homogeneous NaA zeolite layer. But the main problem associated with membrane coating synthesis is crack formation. Formation of crack was reduced by applying intermediate layer, between the support surface and seed layer. A thin Boehmite layer was applied to the support surface before applying seed crystals to enhance the adherence between zeolite seed layer and boehmite layer by hydrogen bonding and also to increase the mechanical strength of the membrane layer. The quality of the membrane layer can be improved by employing the multi-stage coating methods. The permeance of O2, N2 decreased as kinetic diameter of gases increased, which shows the molecular sieving effect of the NaA membrane. The permselectivity of O2/N2 was 1.9–2.0. This value of permselectivity ratio is higher than Knudsen diffusion ratio 0.94; it was also confirmed the molecular sieving properties of synthesized NaA zeolite membrane. DOI : 10.1007/s11998-009-9195-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-009-9195-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9817 [article]

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