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
Reads0
Chats0
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
High silica zeolites with three-dimensional systems of large pore channels
Miguel A. Camblor,Philip A. Barrett,M.J. Díaz-Cabañas,Luis A. Villaescusa,Marta Puche,Teresa Boix,E. Pérez,Hubert Koller +7 more
TL;DR: In this paper, the powder X-ray diffraction patterns of calcined calcined beta materials prepared with different cations were analyzed and the existence of fluoride occluded in double four ring cages in most of the different betas was demonstrated.
Journal ArticleDOI
The role of crystal diversity in understanding mass transfer in nanoporous materials.
Julien Cousin Saint Remi,Alexander Lauerer,Christian Chmelik,Isabelle Vandendael,Herman Terryn,Gino Baron,Joeri Denayer,Jörg Kärger +7 more
TL;DR: It is shown that even apparently identical crystals (that is, crystals of similar size and shape) from the same batch may exhibit very different uptake rates, which adds an important new piece of evidence in the search for the origin of the surface barrier phenomenon.
Journal ArticleDOI
Characterization of Beta/MCM-41 composite molecular sieve compared with the mechanical mixture
TL;DR: In this article, a Beta/MCM-41 composite was prepared for the first time through a two-step crystallization process combining a low crystallized zeolite Beta synthesis gel with a surfactant cetyltrimethylammonium bromide (CTAB) solution.
Journal ArticleDOI
Zeolite Beta with hierarchical porosity prepared from organofunctionalized seeds
TL;DR: In this paper, a new synthesis strategy based on perturbing the growth of the zeolite crystals by functionalization of the seeds with organosilanes in order to hinder and prevent their further aggregation and agglomeration is presented.
Journal ArticleDOI
Biochemical evolution. I. Polymerization on internal, organophilic silica surfaces of dealuminated zeolites and feldspars
TL;DR: Catalysis at mineral surfaces might generate replicating biopolymers from simple chemicals supplied by meteorites, volcanic gases, and photochemical gas reactions, although many ideas are implausible in detail because the proposed mineral surfaces strongly prefer water and other ionic species to organic ones.
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.