Determination of the interface between gas and adsorbed phases in high pressure gas adsorption

摘要

The relationship between the surface excess mass and absolute adsorbed amount for high pressure adsorption of supercritical gas is summarized in order to show new points proposed here. The present method determines the mean density of the adsorbed phase from the crossing point of the surface excess mass isotherm with the abscissa giving the volume of the adsorbed phase by iteration procedures. This approach was applied to high pressure methane adsorption on nonporous carbon black at 273-303 K. The obtained volume of adsorbed methane was great and the corresponding thickness of the adsorbed phase was in the range of 6.1 to 8.4 nm.