PRIMARY AND SECONDARY FILLING OF MICROPORES IN ACTIVE CARBONS

Combined adsorption and calorimetric measurements have been used to ex amine the mechanism of micropore filling in active carbons. It appears that for carbons with medium and high degrees of burn-off (above 45-5 0%), the adsorption at low pressure does not correspond to the filling of narrow micropores, which are virtually absent, but to the initial step of the secondary filling (adsorption on the walls of wide micropo res). The differential heat ol adsorption is smaller than in narrow mi cropores and the extrapolation of the initial part of the non-linear D ubinin-Radushkevich plot corresponds approximately to the surface area of the supermicropores.