Preparation of carbon molecular sieves for gas separations by modificationof the pore sizes of activated carbons

Two activated carbons of different texture were modified by carbon depositi on from the pyrolysis of benzene, in an attempt to obtain carbon molecular sieves of high adsorption capacity and selectivity for the separation of O- 2\N-2 mixtures by pressure swing adsorption (PSA). The results show that th ese objectives can be attained when the carbon precursor has been activated only to a limited extent, and when carbon deposition is carried out in the proper kinetic regime. (C) 2000 Elsevier Science Ltd. All rights reserved.