Silylation of silicalite membrane and its pervaporation performance

Sano, T.; Yamada, K.; Ejiri, Shigeyuki; Hasegawa, Masaru; Kawakami, Yusuke; Yanagishita, Hiroshi

doi:10.1016/s0167-2991(97)80688-x

Cited by 15 publications

(15 citation statements)

References 18 publications

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“…It is well-known that aluminum can be leached from an alumina support during the zeolite crystal growth procedure. 31,32 Lai et al found that leached aluminum has dual roles during the zeolite membrane growth, to facilitate the formation of the hydrogel layer on the support and to retard zeolitization in this hydrogel layer. 31 Subsequently, nucleation and crystallization occur at the interface of the gel layer and the synthesis solution.…”

Section: Resultsmentioning

confidence: 99%

In Situ Growth of Continuous b-Oriented MFI Zeolite Membranes on Porous α-Alumina Substrates Precoated with a Mesoporous Silica Sublayer

2005

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Continuous b-oriented MFI membranes were prepared on a mesoporous silica sublayer-coated porous R-alumina substrate by in situ crystallization. Single gas permeation of butane isomers through the MFI membrane was carried out as a function of temperature from 298 to 473 K. A decreased permeance of butane isomers on the b-oriented MFI membrane with increasing temperature is observed in this temperature range, which is attributed to a weak adsorption effect. Meanwhile, it was revealed that the b-oriented membrane can maintain a high ideal selectivity of n-butane/i-butane at elevated temperatures. On the contrary, a discrete membrane with a randomly oriented top layer was obtained on the uncoated R-alumina substrate. Further investigation on the evolution of the MFI membranes on the two kind substrates was performed with the focus on the understanding of the oriented growth of zeolite crystals. The surface properties of the substrates used played an important role in the formation of MFI membranes with different morphologies. IntroductionIn the past decade, considerable research effort has been applied to the synthesis of high-performance zeolite membranes due to their great potential for application as selective membranes, catalytic membrane reactors, and chemical sensors. 1-5 Because many zeolites consist of microcrystals with an anisotropic structure, the orientation of the zeolite microcrystals can influence the membrane performance in most of these applications. 3,6-8 For the MFI (Silicalite-1 and ZSM-5) membranes, a particularly active research field mainly because of the crystal channel systems with pore diameter (about 0.55 nm) near the sizes of many industrially important organic molecules, the zeolite channel system is 2D: straight channels (b-direction) of elliptical cross section are interconnected with sinusoidal channels (a-direction) of circular cross section; the c-direction represents the tortuous path. There are mainly two approaches for the preparation of continuous, oriented, MFI zeolite membranes. One is the secondary growth technique, 7-11 and the other is the in situ

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Section: Resultsmentioning

confidence: 99%

In Situ Growth of Continuous b-Oriented MFI Zeolite Membranes on Porous α-Alumina Substrates Precoated with a Mesoporous Silica Sublayer

2005

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“…In general, it is acknowledged that the silylation is very useful for modification of the surfaces of organic and inorganic materials [30]. Silane coupling agents have a general formula of YSi(OR) 3 , where R and Y stand for a hydrolysable group (methyl or ethyl) and a non-hydrolysable organofunctional group (amino, methacrylate, mercapto or vinyl groups), capable of interaction with fillers and polymers, respectively [31].…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of vinyltriethoxysilane (VTES) modified silicalite-1/PDMS hybrid pervaporation membrane and its application in ethanol separation from dilute aqueous solution

Yi¹,

Su²,

Wang³

2010

Journal of Membrane Science

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“…In recent years, however, several groups have reported in the literature preparations of high quality zeolite membranes: MFI [11][12][13][14][15][16][17][18][19][20], mordenite [21], Y-type [22], A-type [23][24][25] and ferrierite [26].…”

Section: Introductionmentioning

confidence: 99%

Experimental study and numerical simulation of hydrogen/isobutane permeation and separation using MFI-zeolite membrane reactor

et al. 2000

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A composite alumina-MFI-zeolite membrane has been prepared by a pore-plugging method. Transport through this membrane is controlled by molecular size and adsorption properties, as expected for a defect-free zeolite composite layer.Single gas transport was studied for hydrogen and isobutane. In the studied temperature range, (323-723 K) for isobutane and (277-723 K) for hydrogen, transports were activated. Isobutane exhibited a flux maximum at 450 K, whereas hydrogen flux declined with temperature.These different permeation behaviors were modeled using Maxwell-Stefan equations taking into account only surface diffusion. Activation energies were obtained from the model by fitting the experimental data. They were calculated to be 31 kJ mol −1 for isobutane and 1.9 kJ mol −1 for hydrogen. The diffusion coefficients calculated at 323 K differed by four orders of magnitude.Separation experiments with a mixture of hydrogen and isobutane in a 293-723 K temperature range were performed. Typical permeation behavior was observed for a mixture of weakly and strongly adsorbed molecules. At room temperature, hydrogen permeation was hindered by stronger adsorbed isobutane molecules in the micropores. H 2 /i-C 4 H 10 separation experiments showed a separation factor of 25 at 723 K, a typical temperature of the isobutane dehydrogenation in membrane reactors. RésuméUne membrane composite alumine-zéolithe MFI est préparée par une méthode de bouchage de pores. Le transport à travers la membrane est contrôlé par la taille des molécules et leurs propriétés d'adsorption, comme on peut s'y attendre dans une couche composite zéolithique sans défaut.Le transport des gas purs est étudié pour l'hydrogène et l'isobutane. Dans les domaines de température étudiés, 323-723 K pour l'isobutane et 277-723 K pour l'hydogène, le transport de ces deux gaz est activé. Le flux d'isobutane présente un maximum à 450 K, alors que celui d'hydrogène diminue avec la température.Ces différents comportements en perméation sont modélisés en utilisant les équations de Maxwell-Stefan appliquées uniquement à la diffusion de surface. L'ajustement de l'équation du modèle aux données expérimentales permet d'obtenir les energies d'activation de diffusion. Celles-ci sont de 31 kJ mol −1 pour l'isobutane et de 1.9 kJ mol −1 pour l'hydrogène. Les coefficients de diffusion calculés à 323 K sont dans un rapport de 10 4 .Des expériences de séparation hydrogène/isobutane sont effectuées dans une gamme de température de 293 à 723 K. Il a été observé un comportement en perméation typique d'un mélange binaire de molécules gazeuses fortement et faiblement * Corresponding author. Fax: +33-4-7244-5399. E-mail address: dalmon@catalyse.univ-lyon.fr (J.-A. Dalmon).0920-5861/00/$ -see front matter ©2000 Elsevier Science B.V. All rights reserved. PII: S 0 9 2 0 -5 8 6 1 ( 9 9 ) 0 0 2 8 3 -7 254 P. Ciavarella et al. / Catalysis Today 56 (2000) [253][254][255][256][257][258][259][260][261][262][263][264] adsorbées. À température ambiante, la perméation d'hydrogène est gênée pa...

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Silylation of silicalite membrane and its pervaporation performance

Cited by 15 publications

References 18 publications

In Situ Growth of Continuous b-Oriented MFI Zeolite Membranes on Porous α-Alumina Substrates Precoated with a Mesoporous Silica Sublayer

In Situ Growth of Continuous b-Oriented MFI Zeolite Membranes on Porous α-Alumina Substrates Precoated with a Mesoporous Silica Sublayer

Preparation and characterization of vinyltriethoxysilane (VTES) modified silicalite-1/PDMS hybrid pervaporation membrane and its application in ethanol separation from dilute aqueous solution

Experimental study and numerical simulation of hydrogen/isobutane permeation and separation using MFI-zeolite membrane reactor

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