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
More filters
Journal ArticleDOI
Synthesis of chiral polymorph A-enriched zeolite Beta with an extremely concentrated fluoride route
Mingquan Tong,Daliang Zhang,Weibin Fan,Jun Xu,Liangkui Zhu,Guo Wen,Wenfu Yan,Jihong Yu,Shilun Qiu,Jianguo Wang,Feng Deng,Ruren Xu +11 more
TL;DR: A generalized extremely concentrated fluoride route is demonstrated for the synthesis of chiral polymorph A-enriched zeolite Beta in the presence of five achiral organic structure-directing agents and shows a higher enantioselectivity for the asymmetric epoxidation of alkenes than the normal Ti-Beta.
Journal ArticleDOI
Cumene disproportionation over zeolite β. I: Comparison of catalytic performances and reaction mechanisms of zeolites
TL;DR: In this paper, it has been shown that over twelve-membered ring zeolites, cumene undergoes a bimolecular mechanism; but over ten-mesbered ring zerosites, it undergoes monomolecular mechanisms, and therefore has practical potential for diisopropylbenzenes.
Journal ArticleDOI
Influence of steaming and acid-leaching treatments on the hydrophobicity of HBEA zeolite determined under static conditions
Isabelle Batonneau-Gener,Arsène H. Yonli,Solange Hazael-pascal,J.P. Marques,José Manuel Lopes,Michel Guisnet,Fernando Ramôa Ribeiro,Samuel Mignard +7 more
TL;DR: In this article, a series of HBEA dealuminated samples were prepared by treatment with HCl or steaming of a parent sample, and the hydrophobicity coefficient was determined by separated static adsorption of water and toluene.
Journal ArticleDOI
Mechanisms of Quick Zeolite Beta Crystallization
TL;DR: In this article, a combination of 29Si and 27Al nuclear magnetic resonance (NMR), small angle scattering (SAS), and attenuated total reflectance Fourier transform infrared (ATR/FTIR) spectroscopy was used to study siliceous 4,4′-trimethylenebis(N-methyl, N-benzyl piperidinium) structure directing agent.
Journal ArticleDOI
Adsorption equilibrium studies of CO2, CH4 and N2 on various modified zeolites at high pressures up to 200 bars
TL;DR: In this paper, the authors have experimentally tested six different zeolites including ZSM-5 (3 different silica-to alumina ratio, Si/Al), Mordenite, zeolite-Y and Zeolite β for high pressure CO2, CH4 and N2 adsorption.
References
More filters
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.
Journal ArticleDOI
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.