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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Intergrown New Zeolite Beta Polymorphs with Interconnected 12- Ring Channels Solved by Combining Electron Crystallography and Single-Crystal X‑ray Diffraction
Zheng-Bao Yu,Zheng-Bao Yu,Zheng-Bao Yu,Yu Han,Lan Zhao,Shiliang Huang,Qi-Yu Zheng,Shuangzheng Lin,Armando Córdova,Xiaodong Zou,Junliang Sun,Junliang Sun +11 more
TL;DR: In this article, two new polymorphs of zeolite beta were synthesized by employing dicyclohexylammonium hydroxides as organic structure-directing agents.
Journal ArticleDOI
Synthesis of zeolite beta using silica gel as a source of SiO2
Ramanath N. Bhat,Rajiv Kumar +1 more
TL;DR: In this paper, the feasibility of synthesizing pure zeolite beta in high yields using silica gel as the source of SiO2 is demonstrated, and the phase purity and yield of beta is enhanced by using a silica gels with high surface area.
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Elucidation of Medium-Range Structure in a Dry Gel-Forming *BEA-Type Zeolite
TL;DR: In this paper, double three-membered silicate rings (D3Rs) stabilized by tetraethylammonium (TEA+) cation played a significant role in the crystallization of *BEA-type zeolite.
Journal ArticleDOI
Clathrate compounds of silica.
TL;DR: A review on silica clathrate compounds, which are variants of pure silica zeolites with relatively small voids, is presented, which summarizes the framework topologies, synthetic processes, energetics, physical properties, and some applications of silicaClathrates.
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Liquid-phase alkylation of toluene with long-chain alkenes over HFAU and HBEA zeolites
TL;DR: In this paper, the effect of the pore structure of large pore zeolites on their catalytic properties was determined in liquid phase at 90°C with a toluene/alkene molar ratio of 3.
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.
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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.