molecular sieve

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mo·lec·u·lar sieve

a gellike material with pore sizes of such ranges as to exclude molecules above certain sizes; used in fractionating or purifying macromolecules.

molecular sieve

1 a crystalline chemical separation device with molecular size pores that adsorbs small but not large molecules.
2 a cross-linked polymer that forms a porous sieve used as a supporting medium for chromatographic separation of mixtures of solutes.

molecular sieve

A material (e.g., oxides: silicate, aluminate, zeolite crystals with pores) which is capable of separating molecules based on size.

molecular sieve

A type of sieve in which the molecular material present in the gel or crystal will adsorb molecules of a certain kind and let others pass.
See also: sieve
References in periodicals archive ?
The results showed that the entry of Ce into the channels of Y/SBA-15 could effectively increase the catalytically active centers and improve the catalytic properties of molecular sieves.
085mmol) along with 4A molecular sieves and was then stirred at 70degC overnight.
The molecular sieves are then regenerated by removing the trapped moisture and are recycled back through the process.
The roots of molecular sieves go back to 1756, when a Swedish mineralogist by the name of Cronstedt first discovered intriguing crystals in nature that seemed to froth or boil when heated in a blowpipe flame.
The relatively low level of hydrolysis suggests that the use of molecular sieves is an effective way to control such undesirable process.
Suslick and his colleagues describe their molecular sieve in the October Nature Materials.
A fractionation step and molecular sieve are used to get the solvent and monomer feed dry enough for the polymerization reaction.
He was the main organizer of numerous conferences including the 9th Canadian Symposium on Catalysis (Quebec 1984), a post congress symposium (Quebec 1988), the 35th Canadian Chemical Engineering Conference (1995), an International Zeolite Symposium (Quebec 1995), the 15th Canadian Symposium on Catalysis (Quebec 1998) and the first International Symposium on Mesoporous Molecular Sieves (Baltimore 1998).
This is followed by clear and rigorous exposition of dehydration processes such as Condensation process, Glycol Regeneration and Molecular Sieves.
Limited Tenders are invited for Procurement Of Molecular Sieves & Inert Ball For One Dryer Of Each Cracked Gas, Ethylene & Propylene And For Ammonia & Chlorine Guard Beds Treater In Ecu At Bcpl, Lepetkata
Applied Minerals' various product grades of DRAGONITE halloysite clay are tailored to enhance the property performance for its respective applications in paints and coatings, polymer composites, flame retardants, controlled release, environmental remediation, agriculture, catalysts and molecular sieves, as well as cosmetics.
The major material types within this market are molecular sieves and activated carbon.

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