Accession Number : AD0610897

Title :   A RESEARCH ON THE SORPTION OF WATER VAPOR ON ACTIVE CHARCOALS,

Corporate Author : DIRECTORATE OF SCIENTIFIC INFORMATION SERVICES OTTAWA (ONTARIO)

Personal Author(s) : Dubinin,M. M. ; Zaverina,E. D.

Report Date : 15 SEP 1950

Pagination or Media Count : 6

Abstract : According to the proposed hypothesis on the nature of water-vapor sorption on active charcoal there takes place, in the region before the sharp rise of the S-shaped isotherm, a monomolecular adsorption of water vapor. The formation of a condensed adsorption-film brings about wetting, and causes the micropores of the charcoal to fill up through capillary condensation. The equilibrium pressure p in volume, corresponding to the two-dimensional saturated vapor pressure of the adsorption-film, is dependent on the differential heat of adsorption, and decreases for the more active surface-areas, the fine pores of the charcoal. The non-uniformity of the charcoal surface as regards adsorption leads to a progressive filling-up of micropores of greater and greater size and over a relatively narrow range of pressures. An effect qualitatively similar to the progressive activation of t he charcoal may be obtained by introducing into the charcoal a small quantity of a vapor which adsorbs well and fills up the more active portions of the surface of the charcoal, that is, the small-pore part of the volume.

Descriptors :   (*CHARCOAL, MICROSTRUCTURE), (*WATER VAPOR, SORPTION), (*SORPTION, CHARCOAL), POROSITY, ADSORPTION, GASES, CHEMICAL EQUILIBRIUM, TEST METHODS, USSR, HYSTERESIS, SURFACE PROPERTIES, OXIDATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE