Application of the alpha_s method for analysing benzene, dichloromethane and methanol isotherms determined on molecular sieve and superativated carbons

摘要

Reference data for the adsorption of benzene, dichloromethane and methanol have been used to construct alpha_s plots for the adsorption of these vapours on Carbosieve, Takeda molecular sieve carbons, Maxsorb superactivated carbons and a charcoal cloth. It is shown that the alpha_s method can give satisfactory results when applied to organic adsorptives provided that good quality adsorption data at higher pressures is available. It is also shown how analysis of the alpha_s plots can lead to useful information about the pore structure of hte different types of carbon, and some of the difficulties associated with the use of nitrogen adsorption at 77K for the characterisation of microporous carbons are discussed.