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
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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Acetoxylation and hydration of limonene and α-pinene using cation-exchanged zeolite beta
TL;DR: In this paper, the authors used transition metal and rare earth ion-exchanged beta zeolite catalysts for hydration and acetoxylation of limonene and α-pinene into terpineol and terpinyl acetate.
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Synthesis and Post-Synthesis Transformation of Germanosilicate Zeolites.
TL;DR: This minireview discusses critical aspects of germanosilicate synthesis and their post-synthesis transformations to porous materials.
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Synthesis of nano-crystalline zeolite β: Effects of crystallization parameters
TL;DR: In this paper, the effects of variation in Si/Al ratio (25 and 100) and crystallization temperature (80 °C to 180 °C, at an interval of 20 K) on crystal size of zeolite β were studied.
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Development of a post-synthetic method for tuning the Al content of OSDA-free Beta as a catalyst for conversion of methanol to olefins
Ryoichi Otomo,Ulrich Müller,Mathias Feyen,Bilge Yilmaz,Xiangju Meng,Feng-Shou Xiao,Hermann Gies,Xinhe Bao,Weiping Zhang,Dirk De Vos,Toshiyuki Yokoi +10 more
TL;DR: In this paper, a post-synthetic modification was performed using an Al-rich Beta zeolite synthesized without any organic structure-directing agent (OSDA) to obtain high-silica Beta Zeolites.
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Effect of dealumination on the catalytic performance of Cr-containing Beta zeolite in carbon dioxide assisted propane dehydrogenation
Piotr Michorczyk,Kamila Zeńczak-Tomera,Barbara Michorczyk,Adam Węgrzyniak,Marcelina Basta,Yannick Millot,Laetitia Valentin,Stanislaw Dzwigaj +7 more
TL;DR: In this article, a new active and selective catalysts for propane to propene dehydrogenation in assistance of CO2 (CO2-PDH) were prepared by chromium incorporation in siliceous SiBeta.
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.