Nanoporous Materials and Their Adsorption Properties

A. A. Fomkin

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia

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Received June 5, 2008

Abstract—Principal regularities of forming microporous adsorbents with different surface composition, in particular, active coals, zeolites, silica gels, alumina gels, fullerenes, and carbon nanotubes are considered. The data on the structure-energetecal characteristics of the adsorbents and systems are correlated. Principal characteristic features of the microporous adsorbents deformation during ₂, ₄, Ar, N₂, and Xe adsorption in a 177.65–393 K temperature range at the pressures of up to 7.0 MPa are studied by example of the AUK microporous carbonaceous adsorbent and the NaX zeolite. An analysis of the adsorption deformation of the microporous adsorbents as a function of the adsorption amount, temperature, and physicochemical properties of adsorbed gas is presented. Based on the analysis of benzene adsorption isotherms for the C60 and C70 fullerenes, a suggestion is advanced on the formation of fullerene–benzene adsorption complexes comprising on average three fullerene and two benzene molecules; their characteristic energy comes to ~ 25 kJ/mol. It is shown, by using the adsorption and SEM data that the cuminol adsorption at the nanotubes yields supramolecular complexes in which the cumene molecules act as coordinating ones. By using the micropore bulk filling theory, the hydrogen adsorption is calculated for model supramolecular systems in which the carbon nanotubes are bundled up, with leaving gaps between the bundles.

PACS numbers: 68.43-h