Molecular Sieves
11/7/2008
“A molecular sieve is a material containing tiny pores of a precise and uniform size that is used as an adsorbent for gases and liquids.”
“Molecules small enough to pass through the pores are adsorbed while
larger molecules are not. It is different from a common filter in that it
operates on a molecular level. For instance, a water molecule may be small
enough to pass through while larger molecules are not. Because of this, they
often function as a desiccant. A molecular sieve can adsorb water up to 22% of
its own weight.”
Wikipedia:
http://en.wikipedia.org/wiki/Molecular_sieve (11/8/2008)
Warning: Sometimes the older links no longer work. Go to the US Patent Patent number search page, copy the Patent number into the search box and search. For the articles, use your browser to go the Journal site.
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Notes
“Often molecular sieves consist of aluminosilicate minerals, clays, porous glasses, microporous charcoals, zeolites, active carbons, or synthetic compounds that have open structures through which small molecules, such as nitrogen and water can diffuse.”
“Molecular sieves are often utilized in the petroleum industry, especially for the purification of gas streams and in the chemistry laboratory for separating compounds and drying reaction starting materials. The mercury content of natural gas is extremely harmful to the aluminum piping and other parts of the liquefaction apparatus - silica gel is used in this case.”
“Methods for regeneration of molecular sieves include pressure change (as in
oxygen concentrators), heating and purging with a carrier gas (as when used in
ethanol dehydration), or heating under high vacuum.”
Wikipedia:
http://en.wikipedia.org/wiki/Molecular_sieve (11/8/2008)
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Review Articles
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US Patents
11/25/2008
7,456,330
Molecular sieve catalyst composition, its making and use in conversion processes
11/18/2008
7,453,020
Molecular sieve catalyst composition, its making and use in conversion processes
11/11/2008
7,449,611
Molecular sieve catalyst composition, its making and use in conversion processes
10/28/2008
7,442,365
Process for preparing molecular sieve beads
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Journal Articles
2/6/2009
Octahedral molecular sieves of the type K-OMS-2 with different particle sizes
and morphologies: Impact on the catalytic properties in the aerobic partial
oxidation of benzyl alcohol
(42-49)
Applied Catalysis A: General 355 #1-2 (2009)
1/23/2009
Synthesis of Beta/MCM-41 composite molecular sieve with high hydrothermal
stability in static and stirred condition
(346-350)
Journal of Colloid and Interface Science 329 #2 (2009)
11/21/2008
Structural properties and catalytic activity of Mn-MCM-41 mesoporous
molecular sieves for single-step amination of benzene to aniline
(59-67)
Applied Catalysis A: General 351 #1 (2008)
10/10/2008
Lewis acid metal ion-exchanged MAPO-5 molecular sieves for solvent free
synthesis of coumarin derivative
(23-28)
Catalysis Communications 10 #11 (2008)
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Roger D.
Corneliussen
Editor
Telephone: 610 883 0055
rcorneliussen@4spe.org
www.maropolymeronline.com
Copyright 2008 by Roger D. Corneliussen