Journal ArticleDOI
Confined space synthesis. A novel route to nanosized zeolites.
TLDR
C confined space synthesis appears to be an attractive method for preparation of zeolites with a controlled size distribution for isolation of the pure and highly crystalline zeolite.Abstract:
Confined space synthesis is a novel method in zeolite synthesis. It involves crystallization of the zeolite inside the pore system of an inert mesoporous matrix. In this way it is possible to prepare nanosized zeolites with a controlled size distribution by proper choice of the inert matrix. Here, confined space synthesis was adopted to prepare nanosized ZSM-5, zeolite Beta, zeolite X, and zeolite A with tailored crystal size distributions using mesoporous carbon blacks as inert matrices. All zeolites were characterized by X-ray powder diffraction, transmission electron microscopy, and nitrogen adsorption/desorption prior to and after removal of the carbon matrix. ZSM-5 with Si/Al ratios of 50, 100, and infinity (silicalite-1) were synthesized with controlled average crystal sizes in the range 20-75 nm. Nanosized zeolite Beta (7-30 nm), zeolite X (22-60 nm), and zeolite A (25-37 nm) were prepared similarly. Removal of the carbon matrix by controlled combustion allows a convenient method for isolation of the pure and highly crystalline zeolites. Therefore, confined space synthesis appears to be an attractive method for preparation of zeolites with a controlled size distribution.read more
Citations
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Journal ArticleDOI
The Hydrothermal Synthesis of Zeolites: History and Development from the Earliest Days to the Present Time
Colin S. Cundy,Paul A. Cox +1 more
Journal ArticleDOI
Nanozeolites: Synthesis, Crystallization Mechanism, and Applications
TL;DR: In this article, the synthesis, crystallization mechanism, and application of colloidal zeolites are discussed, focusing on the synthesis formulations and features of different zeolite-type structures prepared in nanosized form.
Journal ArticleDOI
Mesopore-modified zeolites: preparation, characterization, and applications.
Journal ArticleDOI
Functionalization of Porous Carbon Materials with Designed Pore Architecture
TL;DR: In this article, a review examines methods of functionalizing porous carbon through direct incorporation of heteroatoms in the carbon synthesis, surface oxidation and activation, halogenation, sulfonation, grafting, attachment of nanoparticles and surface coating with polymers.
Journal ArticleDOI
Synthesis strategies in the search for hierarchical zeolites
TL;DR: The overall one is the development of methods that are versatile in terms of zeolite structures and compositions, capable of tuning the secondary porosity properties, and being scaled up in a cost-effective way.
References
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Journal ArticleDOI
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
TL;DR: The proposed framework structures are consistent with the known diffraction, sorption, and cation-exchange properties of zeolite beta.
Journal ArticleDOI
The synthesis of discrete colloidal particles of TPA-silicalite-1
TL;DR: In this article, the authors investigated the factors influencing particle size and found that high silica contents in conjunction with high alkalinities favor the synthesis of colloidal silicalite suspensions.
Journal ArticleDOI
Characterization of nanocrystalline zeolite Beta
TL;DR: In this article, a thorough characterization of zeolite Beta materials with crystal sizes in the 200 to 10nm range has been done by using a combination of physicochemical techniques (N 2 adsorption, XRD, multinuclear MAS NMR, pyridine adaption, FTIR, thermal analysis).
Journal 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
TL;DR: 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.
Journal ArticleDOI
Colloidal zeolite suspensions
TL;DR: In this article, a method is presented whereby it is possible to synthesize colloidal zeolite sols containing discrete zeolites particles with an average particle size of less than 150 nm and with a narrow particle-size distribution.