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Crystal structure of tubular Na−LTA zeolite membrane used for a vapor permeation process / Tomohiro Kyotani in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10870–10876 Titre : Crystal structure of tubular Na−LTA zeolite membrane used for a vapor permeation process : unusual distribution of adsorbed water molecules Type de document : texte imprimé Auteurs : Tomohiro Kyotani, Auteur ; Takuji Ikeda, Auteur ; Junji Saito, Auteur Année de publication : 2010 Article en page(s) : pp. 10870–10876 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Crystal--Structure--Tubular--Na−LTA--Zeolite--Membrane--Vapor--Permeation--Process--Unusual--Distribution--Adsorbed--Water--Molecules Résumé : The crystal structure of two tubular zeolite Na−LTA membranes—one as-prepared membrane and a membrane used in vapor permeation (VP) processes of bioethanol—was analyzed using Rietveld refinement with parallel-beam powder X-ray diffraction data. The crystal structure of the as-prepared membrane was consistent with that of typical Na−LTA powder. After the VP process, an unusual relative peak intensity ratio between 200 and 220 reflections was observed in the membrane. The number of adsorbed water molecules in the β-cage was reduced to half. Furthermore, detachment of sodium cations at the six-membered rings was confirmed. The electron density distributions of these Na−LTA zeolite membranes were analyzed by combining the Rietveld method and the maximum entropy method (MEM). MEM electron density images revealed that the adsorbed water molecules and Na+ cations were bonded, forming a hydrated cluster, and that the guest atoms or molecules were highly disordered. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900967e [article] Crystal structure of tubular Na−LTA zeolite membrane used for a vapor permeation process : unusual distribution of adsorbed water molecules [texte imprimé] / Tomohiro Kyotani, Auteur ; Takuji Ikeda, Auteur ; Junji Saito, Auteur . - 2010 . - pp. 10870–10876. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10870–10876 Mots-clés : Crystal--Structure--Tubular--Na−LTA--Zeolite--Membrane--Vapor--Permeation--Process--Unusual--Distribution--Adsorbed--Water--Molecules Résumé : The crystal structure of two tubular zeolite Na−LTA membranes—one as-prepared membrane and a membrane used in vapor permeation (VP) processes of bioethanol—was analyzed using Rietveld refinement with parallel-beam powder X-ray diffraction data. The crystal structure of the as-prepared membrane was consistent with that of typical Na−LTA powder. After the VP process, an unusual relative peak intensity ratio between 200 and 220 reflections was observed in the membrane. The number of adsorbed water molecules in the β-cage was reduced to half. Furthermore, detachment of sodium cations at the six-membered rings was confirmed. The electron density distributions of these Na−LTA zeolite membranes were analyzed by combining the Rietveld method and the maximum entropy method (MEM). MEM electron density images revealed that the adsorbed water molecules and Na+ cations were bonded, forming a hydrated cluster, and that the guest atoms or molecules were highly disordered. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900967e

Crystal structure of tubular Na-LTA zeolite membrane used for a vapor permeation process / Tomohiro Kyotani in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10870–10876 Titre : Crystal structure of tubular Na-LTA zeolite membrane used for a vapor permeation process : unusual distribution of adsorbed water molecules Type de document : texte imprimé Auteurs : Tomohiro Kyotani, Auteur ; Takuji Ikeda, Auteur ; Junji Saito, Auteur Année de publication : 2010 Article en page(s) : pp. 10870–10876 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Tubular  zeolite  Na−LTA  membranes  Bioethanol  Vapor  permeation  processes Résumé : The crystal structure of two tubular zeolite Na−LTA membranes—one as-prepared membrane and a membrane used in vapor permeation (VP) processes of bioethanol—was analyzed using Rietveld refinement with parallel-beam powder X-ray diffraction data. The crystal structure of the as-prepared membrane was consistent with that of typical Na−LTA powder. After the VP process, an unusual relative peak intensity ratio between 200 and 220 reflections was observed in the membrane. The number of adsorbed water molecules in the β-cage was reduced to half. Furthermore, detachment of sodium cations at the six-membered rings was confirmed. The electron density distributions of these Na−LTA zeolite membranes were analyzed by combining the Rietveld method and the maximum entropy method (MEM). MEM electron density images revealed that the adsorbed water molecules and Na+ cations were bonded, forming a hydrated cluster, and that the guest atoms or molecules were highly disordered. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900967e [article] Crystal structure of tubular Na-LTA zeolite membrane used for a vapor permeation process : unusual distribution of adsorbed water molecules [texte imprimé] / Tomohiro Kyotani, Auteur ; Takuji Ikeda, Auteur ; Junji Saito, Auteur . - 2010 . - pp. 10870–10876. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 10870–10876 Mots-clés : Tubular  zeolite  Na−LTA  membranes  Bioethanol  Vapor  permeation  processes Résumé : The crystal structure of two tubular zeolite Na−LTA membranes—one as-prepared membrane and a membrane used in vapor permeation (VP) processes of bioethanol—was analyzed using Rietveld refinement with parallel-beam powder X-ray diffraction data. The crystal structure of the as-prepared membrane was consistent with that of typical Na−LTA powder. After the VP process, an unusual relative peak intensity ratio between 200 and 220 reflections was observed in the membrane. The number of adsorbed water molecules in the β-cage was reduced to half. Furthermore, detachment of sodium cations at the six-membered rings was confirmed. The electron density distributions of these Na−LTA zeolite membranes were analyzed by combining the Rietveld method and the maximum entropy method (MEM). MEM electron density images revealed that the adsorbed water molecules and Na+ cations were bonded, forming a hydrated cluster, and that the guest atoms or molecules were highly disordered. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900967e