Growth model of oriented crystals of zeolite Si-ZSM-5

Koegler, J.H.; Bekkum, H. van; Jansen, J.C.

doi:10.1016/s0144-2449(97)00088-2

Cited by 121 publications

(94 citation statements)

References 17 publications

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“…thickness was needed to obtain a continuous film [25], 35 More recently, the seed film method has been introduced 36 with the aim to better control the growth of zeolites on 37 the studied supports [26][27][28][29][30][31][32][33], This methodology can be 38 adapted to substrates with rather different chemical nat-39 ure, making the synthesis of thin oriented layers of zeo-40 lite crystals possible (see for example Refs. [26,31]).…”

mentioning

confidence: 99%

Preparation of silicalite-1 layers on Pt-coated carbon materials: a possible electrochemical approach towards membrane reactors

Berenguer-Murcia

Morallón

Cazorla‐Amorós

et al. 2005

Microporous and Mesoporous Materials

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10A novel kind of composites is synthesized due to the outstanding properties of carbon materials. Metallic platinum is deposited 11 on porous carbon discs by means of Potential Step Deposition (PSD) under potentiostatic conditions. Afterwards, the Pt-coated 12 discs were covered completely with colloidal zeolite (silicalite-1) crystals by means of the novel Electro Phoretic Deposition 13 (EPD) methodology. After standard hydrothermal treatment, the seed crystal coating becomes continuous, crack-free and well-14 intergrown, giving rise to a layer of silicalite-1 crystals of different sizes. It must be noted that Pt combined with the secondary 15 growth methodology has a extremely important effect on the orientation of the growing zeolite crystals. These novel materials have 16 a wide range of potential applications as membrane reactors and/or catalyst membranes after activation (i.e. template removal by 17 calcination) of the zeolite crystals. 22As a direct consequence of the many applications of 23 crystalline zeolites, such as ion exchangers, adsorbents, 24 and molecular sieves fl], and all the possibilities implied 25 therein, increasing attention has been paid to preparing 26 zeolite membranes over the years [2], 27 Considering the many different strategies that have 28 been employed nowadays [3][4][5][6][7] and the wide variety of 29 supports that have been tested already , one might 30 think that the issue of preparing a supported zeolite 31 membrane has been successfully achieved. This, how-32 ever is not so, because even from the initial approach 33 of the direct treatment of the support with a zeolite pre-34 cursor solution [8]

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mentioning

confidence: 99%

Preparation of silicalite-1 layers on Pt-coated carbon materials: a possible electrochemical approach towards membrane reactors

Berenguer-Murcia

Morallón

Cazorla‐Amorós

et al. 2005

Microporous and Mesoporous Materials

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“…In fact, the growth of silicalite-1 and the related ZSM-5 crystals on glass with their b-axes perpendicular to the substrate planes has also been observed by others [39]. Caro et al showed that electric field (2 kVcm -1 ) can align very long ZSM-5 crystals (> 200 µm in the c-direction) with the c-axes perpendicular to the substrate plane [40].…”

Section: Pdi/bdo Matrix Pdi/tbe Matrixmentioning

confidence: 64%

Synthesis of Zeolite as Ordered Multi-Crystal Arrays using Uniformly Aligned Polyurethane as Templates

Lee

Tae

et al. 2004

MRS Proc.

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Two types of glass plates coated with uniformly aligned polyurethane films were produced by repeating the cycles of the alternative exposures of the glass plates to 1,4-phenylene diisocyanate (PDI) and 2-butyne-1,4-diol (BDO) and to PDI and terephthalic acid bis-(2-hydroxy ethyl) ester (TBE) for 500 times at elevated temperatures. The glass plates coated with uniformly aligned poly-(PDI-BDO) 500 (500 represents the number of the cycle) produced monolayers of closely packed 2D arrays of silicalite-1 crystals with the average size of 370 × 200 × 500 nm on the glass plates upon immersion of the glass plates into a dense gel consisting of tetraethylorthosilicate (TEOS), tetrapropylammonium hydroxide (TPA + OH − ), and water (mole ratio = 7:1.5:330) followed by the hydrothermal reaction at 180 °C for 2 h. The silicalite-1 crystals were aligned with the c-axes perpendicular to the substrate plane. Upon switching the polymer from poly-(PDI-BDO) 500 to poly-(PDI-TBE) 500 the orientations of the silicalite-1 crystals in the 2D arrays changed from c to a axes perpendicular to the substrate. This report therefore demonstrates that the uniformly aligned polyurethane films serve as the templates for the growth of closely packed multi-crystal arrays of silicalite-1 in uniform orientations and the nature of the polyurethane film affects the resulting orientations of the crystals. We propose that the supramolecularly organized organic-inorganic composites consisting of the hydrolyzed organic products and the seed crystals responsible for the above phenomena.

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“…This gel derives from small colloidal particles attracted to the solid by dispersion forces. Nucleation takes place inside the gel which is gradually consumed by the subsequent crystal growth [27][28][29].…”

Section: Synthesis Mixturementioning

confidence: 99%

Zeolite Membranes for Gas and Liquid Separations

Gavalas

2006

Materials Science of Membranes for Gas and Vapor Separation

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Growth model of oriented crystals of zeolite Si-ZSM-5

Cited by 121 publications

References 17 publications

Preparation of silicalite-1 layers on Pt-coated carbon materials: a possible electrochemical approach towards membrane reactors

Preparation of silicalite-1 layers on Pt-coated carbon materials: a possible electrochemical approach towards membrane reactors

Synthesis of Zeolite as Ordered Multi-Crystal Arrays using Uniformly Aligned Polyurethane as Templates

Zeolite Membranes for Gas and Liquid Separations

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