Preparation of carbon molecular sieves, I. Two-step hydrocarbon deposition with a single hydrocarbon
✍ Scribed by A.L. Cabrera; J.E. Zehner; C.G. Coe; T.R. Gaffney; T.S. Farris; J.N. Armor
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 898 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0008-6223
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✦ Synopsis
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 A, 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.