Characterisation of porous carbonaceous sorbents using high pressure - high temperature adsorption data

摘要

This paper aims at presenting the resutls of the potential theory applied to high pressure and high temperature adsorption data for both sub and supercritical fluids. We used two different procedures for hte calculation of the reference characteristic curve. The first one is based on the works by Ozawa, Agarwal and Dubinin. The second one is based on the works by Dhima and Neimark. The second method leads to satisfactory results as it is possible to obtain a unique characteristic curve but it requires the revosion of the classical laws relating the characteristic curve to the structural properties of the adsorbent. Using this procedure, it has been possible to point out the influence of the buoyancy effect on the adsorbed phase for the high pressure data and to propose a method to correct it.