Preparation of carbon molecular sieves, I. Two-step hydrocarbon deposition with a single hydrocarbon

A process is described for preparing a carbon molecular sieve that is suitable for the kinetic separation of gases, such as oxygen from nitrogen. The process involves modifying a carbon support, having a majority of micropores with an effective pore size of about 4.5 to 20 Å, using a two-step proces...

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Bibliographic Details
Published inCarbon (New York) Vol. 31; no. 6; pp. 969 - 976
Main Authors Cabrera, A.L., Zehner, J.E., Coe, C.G., Gaffney, T.R., Farris, T.S., Armor, J.N.
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 1993
Elsevier Science
Subjects
Adsorbents
air separation
carbon
Chemistry
Exact sciences and technology
General and physical chemistry
hydrocarbon decomposition
Molecular sieve
Surface physical chemistry
synthesis
synthesis
air separation
carbon
Molecular sieve
hydrocarbon decomposition
Pyrolysis
Microporosity
Oxygen
Pore size
Separation
Adsorption
Hydrocarbon
Preparation
Nitrogen
Experimental study
Carbon
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Summary:A process is described for preparing a carbon molecular sieve that is suitable for the kinetic separation of gases, such as oxygen from nitrogen. The process involves modifying a carbon support, having a majority of micropores with an effective pore size of about 4.5 to 20 Å, using a two-step process in which the sieve is contacted with two different concentrations of a volatile carbon-containing organic compound. The concentration of the carbon-containing compound used in the first step is larger than that in the second step, so that the pore openings of the micropores of the support are narrowed successively in two distinct steps without excessively filling the micropores themselves.
ISSN:0008-6223
1873-3891
DOI:10.1016/0008-6223(93)90200-T