Separation of alcohols and alcohols/O2 mixtures using zeolite MFI membranes

Piera, Elena; Giroir‐Fendler, A.; Dalmon, J.A.; Moueddeb, Hichem; Coronas, Joaquı́n; Menéndez, M.; Santamarı́a, Jesús

doi:10.1016/s0376-7388(97)00321-9

Cited by 64 publications

(14 citation statements)

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“…In both procedures (a) and (b), the autoclave was placed in a convection oven at 443 K for periods between 8 and 72 h. The synthesis cycle was repeated until a membrane impermeable to N 2 under a pressure gradient of 200 kPa was obtained. The template was then removed by heating up to 753 K at 1 K/min and then maintaining the final temperature for 8 h. The synthesized membranes have a thickness in the range of 5 μm to 80 μm, depending on the synthesis conditions and type of support, as shown in previous studies from our laboratory (Bernal et al, 2000; Piera et al, 1998) and of other groups using similar synthesis procedures (Coronas et al, 1997; Tuan et al, 1999, 2000).…”

Section: Methodsmentioning

confidence: 67%

Separation of CO₂/N₂ mixtures using MFI‐type zeolite membranes

et al. 2004

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Section: Methodsmentioning

confidence: 67%

Separation of CO₂/N₂ mixtures using MFI‐type zeolite membranes

et al. 2004

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“…A detailed description of the composite membrane preparation can be found in previous papers [11,13,31]. The macroporous alumina has a top layer pore size of 200 nm (Membralox T1-70 [32], purchased from SCT/US Filter).…”

Section: Composite Alumina-mfi Membranementioning

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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“…Silicalite-1 membranes have been widely synthesized by two typical techniques: (1) in situ crystallization method [11][12][13][14][15][16]; (2) secondary growth method [17][18][19][20]. In the first method, the bare porous support is put in contact with the zeolite precursors and submitted to hydrothermal synthesis conditions.…”

Section: Introductionmentioning

confidence: 99%