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Titolo:
Transport phenomena through intercrystalline and intracrystalline pathwaysof silicalite zeolite membranes
Autore:
Nomura, M; Yamaguchi, T; Nakao, S;
Indirizzi:
Univ Tokyo, Dept Chem Syst Engn, Bunkyo Ku, Tokyo 1138656, Japan Univ Tokyo Tokyo Japan 1138656 yst Engn, Bunkyo Ku, Tokyo 1138656, Japan
Titolo Testata:
JOURNAL OF MEMBRANE SCIENCE
fascicolo: 1-2, volume: 187, anno: 2001,
pagine: 203 - 212
SICI:
0376-7388(20010615)187:1-2<203:TPTIAI>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
ALUMINA COMPOSITE MEMBRANES; ISOMER VAPORS; MFI MEMBRANES; NAA MEMBRANE; PERMEATION; SEPARATION; ZSM-5; PERVAPORATION; MIXTURES;
Keywords:
inorganic membranes; microporous and porous membranes; silicalite membranes; dual-sorption model; intercrystalline-intracrystalline;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Nomura, M Waseda Univ, Dept Appl Chem, Shinjuku Ku, 3-4-1 Okubo, Tokyo 1698555, Japan Waseda Univ 3-4-1 Okubo Tokyo Japan 1698555 okyo 1698555, Japan
Citazione:
M. Nomura et al., "Transport phenomena through intercrystalline and intracrystalline pathwaysof silicalite zeolite membranes", J MEMBR SCI, 187(1-2), 2001, pp. 203-212

Abstract

Zeolite membranes are, generally, polycrystalline structures. Penetrant molecules pass through zeolite crystals (intracrystalline pathways) and intercrystalline pathways. The transport phenomena of ethanol through intracrystalline and intercrystalline pathways of silicalite membranes were separately examined. An intercrystalline-intracrystalline model (i-i model) is proposed for quantitative discussion of fluxes through intercrystalline and intracrystalline pathways. The concentration in the interface of the intracrystalline region is of the Langmuir type, and the concentration in the intercrystalline region is proportional to the activity on the outside of the membrane. This i-i model was investigated using silicalite membranes and silicalite membranes modified by chemical vapor deposition (CVD). CVD modification was carried out using a tetramethylorthosilicate (TMOS)/O-3 counter-diffusion CVD technique. The i-i model can quantitatively explain the permeate properties of ethanol transport both through the silicalite membrane and theCVD modified membrane. According to this model, ethanol is permselective from ethanol/water mixtures through intercrystalline pathways. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/07/20 alle ore 01:40:48