Maro Publications

Molecular Sieves

Notes

*4/15/2013 
from 4/15/2013

Maro Encyclopedia

Comments

Patent Abstracts

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Nanofoams

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Notes

“Molecular sieve materials, both natural and synthetic, have catalytic properties for various types of hydrocarbon conversion. Certain molecular sieves (e.g., zeolites, AlPOs, and/or mesoporous materials) are ordered, porous crystalline materials having a definite crystalline structure. Within the crystalline molecular sieve material there are a large number of cavities which may be interconnected by a number of channels or pores. These cavities and pores are uniform in size within a specific molecular sieve material. Since the dimensions of these pores are such as to accept for adsorption molecules of certain dimensions while rejecting those of larger dimensions, these materials have come to be known as "molecular sieves" and are utilized in a variety of industrial processes.” [Lai and Kay, US Patent 8,398,955, (3/19/2013)]

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1. “A molecular sieve is a material with very small holes of precise and uniform size. These holes are small enough to block large molecules and allow small molecules to pass. Many molecular sieves are used as desiccants. Examples: Activated charcoal and silica gels are molecular sieves.

A molecular sieve diameter are measured in Angstrom (Ĺ) or nanometers (nm). The unit conversion for 1 Ĺ is 0.1 nm.

According to IUPAC notation,[2]microporous materials have pore diameters of less than 2 nm (20 Ĺ) and macroporous materials have pore diameters of greater than 50 nm (500 Ĺ); the mesoporous category thus lies in the middle with pore diameters between 2 and 50 nm (20-500 Ĺ).”

(Molecular Sieves, Wikipedia, 4/15/2013)

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Interested!!
Bookmark this page to follow future developments!.
(RDC 6/5/2012)

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Roger D. Corneliussen
Editor
www.maropolymeronline.com

Maro Polymer Links
Tel: 610 363 9920
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E-Mail: cornelrd@bee.net  

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Copyright 2013 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen
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* Date of latest addition; date of first entry is 4/15/2013.