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
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Topotactic Conversion of Alkali-Treated Intergrown Germanosilicate CIT-13 into Single-Crystalline ECNU-21 Zeolite as Shape-Selective Catalyst for Ethylene Oxide Hydration.
Xue Liu,Wenting Mao,Jingang Jiang,Xinqing Lu,Mingming Peng,Hao Xu,Lu Han,Shunai Che,Shunai Che,Peng Wu +9 more
TL;DR: With an ordered crystalline structure of 10-ring (R) channels as well as suitable germanium-related Lewis acid sites, ECNU-21 serves as a stable solid Lewis acid catalyst for the shape-selective hydration of ethylene oxide to ethylene glycol at greatly reduced H2 O/EO ratios and reaction temperature in comparison with the noncatalytic industrial process.
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Factors affecting drug adsorption on beta zeolites.
Luisa Pasti,Elena Sarti,Alberto Cavazzini,Nicola Marchetti,Francesco Dondi,Annalisa Martucci +5 more
TL;DR: The adsorption behaviour of three commonly used drugs, namely ketoprofen, hydrochlorothiazide and atenolol, from diluted aqueous solutions on beta zeolites with different SiO2/Al2O3 ratio was investigated by changing the ionic strength and the pH, before and after thermal treatment of the adsorbents.
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Variable-Temperature Electron Paramagnetic Resonance Studies of Copper-Exchanged Zeolites
Patrick J. Carl,Sarah C. Larsen +1 more
TL;DR: In this article, a variable-temperature electron paramagnetic resonance (EPR) spectroscopy was used to probe changes in the local environment of the Cu 2+ centers when samples were dehydrated and heated in flowing helium or under reagent flow.
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Stacking disorders in zeolites and open-frameworks - structure elucidation and analysis by electron crystallography and X-ray diffraction
Tom Willhammar,Xiaodong Zou +1 more
TL;DR: In this paper, the authors found that intergrowth and stacking disorders are often found in minerals and synthetic zeolites and inorganic open-frameworks and structure elucidation of stacking disorders in these materials have been difficu...
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.