Open AccessJournal Article
The framework topology of zeolite beta
John B. Higgins,R.B. LaPierre,John L. Schlenker,A.C. Rohrman,J.D. Wood,G.T. Kerr,W.J. Rohrbaugh +6 more
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TLDR
The tetrahedral framework structure of zeolite beta is disordered along (001) planes as mentioned in this paper, and the disordered structure is related by a/3 and/or b/3 displacements on (1) planes to three ordered polytype structures with triclinic, monoclinic and tetragonal symmetry.Abstract:
The tetrahedral framework structure of zeolite beta is disordered along (001). The disordered structure is related by a/3 and/or b/3 displacements on (001) planes to three ordered polytype structures with triclinic, monoclinic, and tetragonal symmetry. Three mutually perpendicular 12-ring channel systems are characteristic of the three ordered polytypes and the disordered beta structure. The proposed framework structures are consistent with the known diffraction, sorption an cation exchange properties of zeolite beta.read more
Citations
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Hydrothermal crystallization of zeolite beta using tetraethylammonium bromide
TL;DR: In this article, the effect of the SiO 2 Al 2 O 3 ratio, alkalinity, gel dilution, amount of the seed crystals and alkali metal, nature of the organic template, and time and temperature of the synthesis was investigated.
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Cobalt-containing BEA zeolite for catalytic combustion of toluene
Anna Rokicińska,Marek Drozdek,Barbara Dudek,Barbara Gil,Piotr Michorczyk,Dalil Brouri,Stanislaw Dzwigaj,Piotr Kuśtrowski +7 more
TL;DR: In this article, a two-step post-synthesis method was used to dealuminate parent BEA zeolite to obtain an aluminium-free SiBEA support and then contact of the obtained material with an aqueous solution of cobalt nitrate.
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Acid sites in zeolite Beta: effects of ammonium exchange and steaming
TL;DR: In this paper, the authors observed octahedral aluminum species connected to the framework structure of zeolite Beta, and these aluminum sites exhibit characteristics of Lewis acid sites, which are created by partial hydrolysis of framework Si-O-Al bonds; they convert reversibly to tetrahedral aluminum sites upon aqueous NH+4 exchange or reaction with NH3 gas.
Journal ArticleDOI
Crystallization mechanism of all-silica zeolite beta in fluoride medium
TL;DR: In this paper, the crystallization mechanism of pure silica zeolite beta in a fluoride medium has been investigated through the characterization of samples obtained at different synthesis times, and the first crystals detected in the system are very large, with sizes around 7 μm.
Journal ArticleDOI
Synthesis of zeolite Beta from nonalkaline fluoride aqueous aluminosilicate gels
TL;DR: In this article, an original synthesis procedure, where the hydroxide ions are replaced by fluoride anions as the mineralizing agent, was used to prepare zeolite Beta from near-neutral nonalkaline reaction mixtures containing diaza-1,4-bicyclo [2.2] octane and methylamine.
References
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Journal ArticleDOI
The crystal structure of mordenite (ptilolite)
TL;DR: Mordenite, a zeolite, was derived by superposition of the three-dimensional Patterson function and partially refined assuming the centric symmetry Cmcm or Cmc2t as discussed by the authors.
Journal ArticleDOI
The framework topology of ZSM-12: A high-silica zeolite
TL;DR: In this article, the structure of ZSM-12, a high-silica zeolite, was determined by analysis of electron and X-ray powder diffraction data combined with model building.
Journal ArticleDOI
The framework topology of ZSM-22: A high silica zeolite
TL;DR: ZSM-22 as discussed by the authors, an orthorhombic high silica zeolite (Cmcm, a = 13.86 ± 0.03A, b = 17.41± 0.04A, and c = 5.5 × 4.5 A), has a framework consisting of 5-, 6- and 10-rings.
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The framework topology of ZSM-48: A high silica zeolite
TL;DR: In this article, a disordered structure consisting of ferrierite sheets linked via bridging oxygens located on mirror planes is proposed for this material, characterized by ten-ring noninterpenetrating linear channels whose ideal dimensions are 5.3 × 5.6 A.
Journal ArticleDOI
The framework topology of ZSM-23: A high silica zeolite
A.C. Rohrman,R.B. LaPierre,J.L. Schlenker,J.D. Wood,Ernest W. Valyocsik,M.K. Rubin,J.B. Higgins,W.J. Rohrbaugh +7 more
TL;DR: ZSM-23 as discussed by the authors is a high-silica zeolite with lattice parameters of: a = 5.01 ± 0.02A, b = 21.52± 0.04A, and c = 11.13 ± 1.03A.