Molecular sieves and their use
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Molecular sieves and their use

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Published by Crosfield in Warrington .
Written in English


Book details:

Edition Notes

Originally published as "Molekuliamye sita i ikh primenenie". Moscow: Khimilia, 1964.

Statementby V.A. Sokolov, N.S. Torocheshnikov, N.V. Kel"tsev.
ContributionsTorocheshnikov, N. S., Kel"tsev, N. V.
ID Numbers
Open LibraryOL20277339M

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The porous structure of molecular sieves, combined with their chemical composition, makes them uniquely suitable for use as catalysts or catalytic supports. As such, the materials are used in a wide range of chemical reactions, and as components of formulated products. The shape selectivity ofBrand: Springer Netherlands. @article{osti_, title = {An introduction to zeolite molecular sieves}, author = {Dyer, A.}, abstractNote = {This book covers the following topics: What is a zeolite ; Natural zeolites and their occurrence; The structure of zeolites; Zeolite structure identification and characterization; Zeolite syntheses; Zeolites as ion exchangers; Zeolites as molecular sieves and drying agents; The. A molecular sieve is a material with pores (very small holes) of uniform size. These pore diameters are similar in size to small molecules, and thus large molecules cannot enter or be adsorbed, while smaller molecules a mixture of molecules migrate through the stationary bed of porous, semi-solid substance referred to as a sieve (or matrix), the components of highest molecular weight. Molecular sieve is a general term, but when unqualified, usually refers to artificially prepared zeolites which are sodium, potassium or calcium aluminosilicates. Of the range of molecular sieves available, only 5A and 13X are in common use and have pore diameters (Table ) that are of the same order as the dimensions of small molecules. For.

The porous structure of molecular sieves, combined with their chemical composition, makes them uniquely suitable for use as catalysts or catalytic supports. As such, the materials are used in a wide range of chemical reactions, and as components of formulated products. The shape selectivity of the materials further enhances their chemical usefulness, and exploitation of their unique absorption 4/5(1). Alternatively, small quantities of molecular sieves may be dried in the absence of a purge gas by oven heating followed by slow cooling in a closed system, such as a desiccator. Table 3 lists some common molecules and their critical diameters. Molecular sieves are natural or synthetic crystalline aluminosilicates (zeolites), characterized by high sorption selectivity and capacity. Their crystal lattice consists of SiO 4 and AlO 4 tetrahedra. The SiO 4 group is electrically neutral as a result of sharing of its oxygen atoms, while the AlO 4 group has a single negative charge, compensated by a cation (Li +, Na +, K +, Ca 2+, Sr 2+, etc.). Zeolite molecular sieves: structure, chemistry, and use. Donald W. Breck. Zeolite molecular sieves: structure, chemistry, and use hydrogen hydroxyl groups interaction ion exchange isotherms kaolin Kinetic Diameter laumontite lite metakaolin mixture mole Molecular Sieve Molecular Sieve Zeolites mordenite NaOH natrolite nitrogen oxygen.

Some molecular sieves are used in chromatography, a separation technique that sorts molecules based on their size. Other molecular sieves are used as desiccants.   Zeolite Molecular Sieves - Structure, Chemistry, and Use Details Rarely in our technological society does the discovery of a new class of inorganic materials result in such a wide scientific interest and kaleidoscopic development of applications as has happened with the zeolite molecular sieves. Molecular Sieves have the ability to absorb moisture from the air quickly. For maximum effectiveness care should be taken to minimize transfer time. Store unused Molecular Sieves in their original moisture proof container; Molecular Sieve is water reactive. Material can react with water liberating extreme heat. Zeolite molecular sieves are used in industrial applications since more than 60 years, mainly as highly efficient adsorbents for separation processes in gas or liquid phase. Zeolite molecular sieves may be applied in powder form, preferably in static applications, but to a much larger extent as shaped material in both static and dynamic (flowing media) by: 2.