Template-removal-associated microstructural development of porous-ceramic-supported MFI zeolite membranes

Dong, Junhang; Lin, Jerry Y S; Hu, Michael Z.; Peascoe, R.; Payzant, E. Andrew

doi:10.1016/s1387-1811(99)00175-4

Cited by 238 publications

(128 citation statements)

References 18 publications

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“…This property makes nanocomposite membranes the materials of choice when large surface areas are involved. Another consequence is that mass transfer within these membranes at high temperature (> 400 K) is kept governed by zeolite pores instead of intercrystalline openings that may appear in film-like configurations, allowing selectivity by molecular-sieving at high temperatures [15,[22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Nanocomposite MFI-alumina and FAU-alumina Membranes: Synthesis, Characterization and Application to Paraffin Separation and CO₂Capture

Rouleau¹,

Pirngruber²,

Guillou³

et al. 2009

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Membranes nanocomposites MFI-alumine et FAU-alumine : synthèse, caractérisation & application à la séparation de paraffines et à la capture du CO 2 -Dans ce travail, nous rapportons la préparation de membranes nanocomposites MFI-alumine et FAU-alumine de haute surface (24-cm 2 ), thermiquement et mécaniquement résistantes, par synthèse de zéolithe dans les macropores de supports tubulaires en alumine α. Les membranes MFI ont été préparées à partir de mélange de précurseurs de type solution claire de manière à facilement pénétrer dans les pores du support. Les membranes MFI ont été évaluées en séparation de mélanges n-/i-butane. La fiabilité des synthèses a été améliorée par une agitation modérée. Les membranes MFI les plus sélectives ont été obtenues pour des supports avec des tailles moyennes de pores de 0,2 et 0,8 μm. L'épaisseur effective de MFI a pu être réduite à moins de 10 μm par imprégnation du support avec de l'eau avant la synthèse et par dilution du mélange de synthèse. La meilleure membrane MFI offre un excellent compromis entre sélectivité et perméance à 448 K, avec des facteurs de séparation pour les mélanges n-butane/i-butane jusqu'à 18 et des perméances du n-butane en mélange aussi élevées que 0,7 μmol⋅s -1 ⋅m -2 ⋅Pa -1 . Par ailleurs, une nouvelle architecture de membrane nanocomposite FAU a été obtenue par une voie de synthèse originale incluant un ensemencement in situ à partir d'un mélange refroidi de précurseur de type gel, suivi de croissance de la FAU par synthèse hydrothermale en deux étapes avec une solution claire de faible viscosité. Cette nouvelle membrane a montré des performances intéressantes en séparation de mélange équimolaire CO 2 /N 2 à 323 K, avec des facteurs de séparation CO 2 /N 2 et des perméances de CO 2 en mélange jusqu'à 12 et 0,4 μmol⋅s -1 ⋅m -2 ⋅Pa -1 , respectivement.Abstract -Nanocomposite MFI-alumina and FAU-alumina Membranes: Synthesis, Characterization and Application to Paraffin Separation and CO 2 Capture -In this work, we report the preparation of thermally and mechanically resistant high-surface (24-cm 2 ) nanocomposite MFI-alumina and FAUalumina membranes by pore-plugging synthesis inside the macropores of α-alumina multilayered

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Section: Introductionmentioning

confidence: 99%

Nanocomposite MFI-alumina and FAU-alumina Membranes: Synthesis, Characterization and Application to Paraffin Separation and CO₂Capture

Rouleau¹,

Pirngruber²,

Guillou³

et al. 2009

Oil & Gas Science and Technology - Rev. IFP

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“…Their relatively large size but small number suggests that they are associated with the larger pores of the alumina support, at the tail end of the pore size distribution. One possible source of these gaps is dimensional changes and stresses accompanying calcination as discussed in references [11,12]. Another possible source of gaps is intrinsic to the chemistry of zeolite growth, especially at relatively low alkalinity and temperature as in the present experiments.…”

Section: Permeation Propertiesmentioning

confidence: 75%

“…As mentioned in chapter 1, the silicalite layers deposited on α-Al 2 O 3 contain defects such as cracks or voids between the crystals. These voids are due to incomplete growth of the crystals or, more commonly, are generated during the calcination employed to remove organic templates employed in the growth solution [11,12]. In the present chapter we describe results on silica/silicalite/ α-Al 2 O 3 membranes prepared by deposition of silica using silicon tetrachloride hydrolysis at temperatures 400-600 o C.…”

Section: Conclusion To Chaptermentioning

confidence: 99%

Ceramic Membranes for Hydrogen Production From Coal

Gavalas¹

2004

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“…In fact, the lattice constant of MFI zeolite was reported to be about 2 nm along both a-and b-axis [33]. Considering the pore width of 0.55 nm along the a-axis and 0.53 nm along the b-axis [1], the wall thickness was estimated to be about 1.5 nm.…”

Section: Modeling Resultsmentioning

confidence: 99%

Temperature Dependent Thermal Conductivity of Pure Silica MEL and MFI Zeolite Thin Films

Fang

Huang

Pilon

et al. 2012

ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer

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Several studies have reported the thermal conductivity of powdered zeolites [12][13][14][15]. Effects of temperature, filling gas, moisture, and pressure were investigated [12][13][14][15]. In addition, Greenstein et al. [16] and Hudiono et al. [17] measured thermal conductivity of PSZ MFI zeolite films with thickness ranging from 10 to 20 µm and temperature varying from 150 to 450 K. The MFI films were synthesized by secondary growth through a seeded hydrothermal process on alumina substrates. The measured thermal conductivity of (h0l)-oriented PSZ MFI films varied from 1.0 to 1.4 W/m·K in the temperature range considered [17]. That of calcined and uncalcined c-oriented PSZ MFI films deposited on silicon substrates was found to range from 0.75 to 1.1 W/m·K and 1.0 to 1.6 W/m·K, respectively [16]. More recently, Coquil et al. [18] measured room temperature thermal conductivity of PSZ MFI and MEL zeolite thin films. The MFI thin films were b-oriented, fully crystalline, and had a porosity of 33%. The MEL thin films featured porosity, relative crystallinity, and particle size ranging from 40% to 59%, 23% to 47%, and 55 to 80 nm, respectively. The authors found the thermal conductivity to be around 1.02±0.10 W/m·K for all films despite their different porosity, relative crystallinity, and nanoparticle size. Methods and Experiments 2.1 Sample film preparationSynthesis of PSZ MFI and MEL thin films investigated in the present study were previously described in detail [1,6,18]. MFI thin films were synthesized by in situ crystallization and were b-oriented. The MEL films were prepared by spin coating a zeolite nanoparticle suspension onto silicon substrates. The MEL suspension was synthesized by a two-stage process [1]. The first stage consisted of a 2 days heating and stirring of a tetraethylorthosilicate (TEOS) based solution at 80 • C resulting in a MEL nanoparticle suspension. The second stage corresponded to the growth of the MEL nanoparticles from the same solution in a convection oven at 114 • C. Finally, MEL thin films were obtained by spin-coating the solution onto silicon substrates. Both relative crystallinity and nanoparticle size of the PSZ MEL increased as the second stage synthesis time increased. Here, the relative crystallinity is defined as the ratio of the micropore volume to the micropore volume of a fully crystalline PSZ MEL microcrystal [1]. Four different sets of MEL films corresponding to four different second stage synthesis times (15, 18, 21 and 24 hours) were studied. Note that all the MEL and MFI thin films were made hydrophobic by vapor-phase silylation with trimethylchlorosilane as described in Ref. [1].

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Template-removal-associated microstructural development of porous-ceramic-supported MFI zeolite membranes

Cited by 238 publications

References 18 publications

Nanocomposite MFI-alumina and FAU-alumina Membranes: Synthesis, Characterization and Application to Paraffin Separation and CO₂Capture

Nanocomposite MFI-alumina and FAU-alumina Membranes: Synthesis, Characterization and Application to Paraffin Separation and CO₂Capture

Ceramic Membranes for Hydrogen Production From Coal

Temperature Dependent Thermal Conductivity of Pure Silica MEL and MFI Zeolite Thin Films

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Template-removal-associated microstructural development of porous-ceramic-supported MFI zeolite membranes

Cited by 238 publications

References 18 publications

Nanocomposite MFI-alumina and FAU-alumina Membranes: Synthesis, Characterization and Application to Paraffin Separation and CO2Capture

Nanocomposite MFI-alumina and FAU-alumina Membranes: Synthesis, Characterization and Application to Paraffin Separation and CO2Capture

Ceramic Membranes for Hydrogen Production From Coal

Temperature Dependent Thermal Conductivity of Pure Silica MEL and MFI Zeolite Thin Films

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Product

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Nanocomposite MFI-alumina and FAU-alumina Membranes: Synthesis, Characterization and Application to Paraffin Separation and CO₂Capture

Nanocomposite MFI-alumina and FAU-alumina Membranes: Synthesis, Characterization and Application to Paraffin Separation and CO₂Capture