Abstract
When the α s or t methods and the DR (Dubinin–Radushkevich) or DA (Dubinin–Astakhov) Equations are used to analyse nitrogen adsorption isotherms determined at 77 K on activated carbon aerogels it is found that, in contrast to the behaviour generally found with other carbon materials, the α s or t estimate of micropore volume is significantly less than the DR or DA estimate. In this paper the reasons for the overestimation of the DA micropore volume and underestimation of the α s micropore volume are explained and it is shown how use of the n-nonane pre-adsorption method enables consistent values of micropore volume to be obtained.
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