Influence of Active Carbon Modification on Its Porous Structure and Heat Effects of Methanol Vapours Adsorption

Methanol adsorption of the active carbon seems to be very interesting for use in thermodynamic systems such as heat pumps and transformers as well as cooling systems. The porous structure of commercial active carbon modified by successive removal of external layers from a particle surface as produced by abrasion in a spouted bed and by demineralization was evaluated on the basis of the nitrogen adsorption data and those for methanol. The modifications improve densimetric characteristics and heat effects of methanol adsorption. Porous structure parameters obtained for nitrogen and methanol agreed reasonably well and Dubinin-Radushkevich approach can be a useful method for characterization of these systems. The methods for calculation of heat effects of methanol adsorption in a wide range of temperature and pressures are discussed.