Modification of pore size in activated carbon by polymer deposition and its effects on molecular sieve selectivity

The separation of air for nitrogen production can be carried out by pressure-swing-adsorption over a carbon molecular sieve. The separation is kinetically controlled, since the equilibrium adsorption of both oxygen and nitrogen is very similar, but the adsorption kinetics for oxygen is faster than f...

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Bibliographic Details
Published in:Carbon (New York) 2001-01, Vol.39 (15), p.2269-2276
Main Authors: Moreira, R.F.P.M, José, H.J, Rodrigues, A.E
Format: Article
Language:English
Subjects:
A. Molecular sieves
Adsorbents
B. Activated carbon
C. Adsorption properties
Chemistry
Exact sciences and technology
General and physical chemistry
Surface physical chemistry
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Summary:The separation of air for nitrogen production can be carried out by pressure-swing-adsorption over a carbon molecular sieve. The separation is kinetically controlled, since the equilibrium adsorption of both oxygen and nitrogen is very similar, but the adsorption kinetics for oxygen is faster than for nitrogen. Several methods to prepare carbon molecular sieves are reported. In this work, we synthesized a carbon molecular sieve from a commercial activated carbon. After deposition of polyfurfuryl alcohol, these materials were subjected to carbonization at 800°C under an inert atmosphere. All the microporous materials were characterized by analysis of kinetics and equilibrium adsorption data. The molecular sieve performance was assessed by the O 2/N 2 uptake ratio. The material prepared by two depositions has characteristics similar to those of commercial CMS.
ISSN:0008-6223
1873-3891
DOI:10.1016/S0008-6223(01)00046-X