MOLECULAR-INTERACTIONS IN NANOPOROUS ADSORBENTS - ADSORPTION OF N-2 AND O-2 IN ZEOLITES WITH CAVITIES OR CHANNELS - NA(12)A, CA(6)A, NAX, AND DECATIONATED MORDENITE

The adsorption of two small molecules in porous crystals presenting vo id volumes of different shapes (cavities of similar to 12 Angstrom dia meter, channels of similar to 6 Angstrom diameter) is measured in a la rge range of temperatures and pressures. The data analysis shows off t he difference in the intermolecular forces between N-2 and O-2 molecul es; in condensed phases the molecule-molecule interaction is repulsive and it is more repulsive for N-2. The density of the adsorbed phase i s compared with that of the liquid at three temperatures; that points out the confinement effect which is dominant in the channels.