Preparation of an Asymmetric Zeolite L Film

Lovallo, Mark; Tsapatsis, Michael; Okubo, Tatsuya

doi:10.1021/cm960037b

Cited by 88 publications

(47 citation statements)

References 28 publications

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“…Highly water-selective mordenite membranes resulted in achieving a separation factor more than 250 for the separation of water-acetic acid solutions [61]. The reproducible preparation of defect-free membranes is still challenging although different synthesis methods, like secondary growth, have been developed to improve membrane quality [62]. Additionally, zeolite membrane preparation methods are still carried out batch-wise whereas continuous methods are needed in order to scale-up production [63].…”

Section: Membranesmentioning

confidence: 99%

Potential of Pervaporation and Vapor Separation with Water Selective Membranes for an Optimized Production of Biofuels—A Review

2017

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Abstract:The development of processes based on the integration of new technologies is of growing interest to industrial catalysis. Recently, significant efforts have been focused on the design of catalytic membrane reactors to improve process performance. In particular, the use of membranes, that allow a selective permeation of water from the reaction mixture, positively affects the reaction evolution by improving conversion for all reactions thermodynamically or kinetically limited by the presence of water. In this paper, how pervaporation (PV) and vapor permeation (VP) technologies can improve the catalytic performance of reactions of industrial interest is considered. Specifically, technological approaches proposed in the literature are discussed with the aim of highlighting advantages and problems encountered in order to address research towards the optimization of membrane reactor configurations for liquid biofuel production in large scale.

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Section: Membranesmentioning

confidence: 99%

Potential of Pervaporation and Vapor Separation with Water Selective Membranes for an Optimized Production of Biofuels—A Review

2017

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“…The vertically assembled zeolite L monolayers also have the potential to be transformed into continuous films with one-dimensional channels all oriented perpendicular to the substrate, an arrangement that has been shown to be very difficult to obtain. [35] …”

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confidence: 99%

Facile Monolayer Assembly of Fluorophore‐Containing Zeolite Rods in Uniform Orientations for Anisotropic Photoluminescence

Lee

Lim

et al. 2006

Angew Chem Int Ed

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Which way to turn: The tendency of microcrystals to attach to surfaces through their largest faces has resulted in two orientations of zeolite L monolayers on glass. Fluorophore‐containing cylindrical and hexagonal columnar zeolite L crystals assemble into vertically and horizontally oriented monolayers, respectively, on glass plates (see pictures). The photoluminescences of the monolayers are highly anisotropic.

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“…A number of techniques for the fabrication of zeolite-based constructs have been developed, particularly involving the use of nanosized molecular sieves [26][27][28][29][30][31][32][33][34] . These techniques can be divided into three main groups: (i) direct synthesis of zeolite crystals on a support, (ii) seed method, and (iii) attachment of crystals on functionalized surfaces via spin-and dip-coating approaches.…”

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confidence: 99%

“…Moreover, colloidal molecular sieves with particle sizes in the nanometer range can have high colloidal stability in different solvents with respect to further agglomeration and sedimentation. These features also make the encapsulation of functional optical molecules in nanoscale zeolite suspensions an attractive synthetic target [36][37][38] .…”

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confidence: 99%

Nanosized Molecular Sieves

Mintova

2003

Collect. Czech. Chem. Commun.

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Nanosized molecular sieves or colloidal zeolites are crystalline porous solids with particle sizes in the range of 10-1000 nm; they are synthesized from colloidal precursor solutions under hydrothermal conditions at temperatures lower than 100°C. The complex mechanism by which nanosized microporous materials are assembling from framework constituent precursor species under heating is investigated by in situ dynamic light scattering, X-ray diffraction using synchrotron radiation, high resolution transmission electron microscopy, and IR/Raman spectroscopies. The development of new crystallization methods that allow the fabrication of zeolites in forms suitable for practical utilization, such as thin films, layers, and monoliths based on the seed method and spin coating approach is discussed. In situ X-ray measurements of zeolite crystal growth simultaneously in solutions and films are performed, in which near surface depth-sensitive grazing incidence diffraction is combined with the in situ growth of thin zeolite films that is ideally suited to shed light on the unresolved mechanisms of self-organized channel orientation for various zeolite systems. In addition, the nanosized Faujasite (FAU) zeolite was employed as host for the stabilization of guest molecules such as 2-(2′-hydroxyphenyl)benzothiazole (HBT); the trans keto tautomer of HBT inside the FAU zeolite is demonstrated and compared with the cis keto tautomer formed in ethanolic solution.

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Preparation of an Asymmetric Zeolite L Film

Abstract: Figure 2. (a) Transmission electron microscopy (TEM) image of zeolite L (structure code LTL) nanoclusters. Sample preparation, image acquisition and synthesis conditions as in ref 22. (b) TEM image of regrown crystals.

Cited by 88 publications

References 28 publications

Potential of Pervaporation and Vapor Separation with Water Selective Membranes for an Optimized Production of Biofuels—A Review

Potential of Pervaporation and Vapor Separation with Water Selective Membranes for an Optimized Production of Biofuels—A Review

Facile Monolayer Assembly of Fluorophore‐Containing Zeolite Rods in Uniform Orientations for Anisotropic Photoluminescence

Nanosized Molecular Sieves

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