Open AccessDependence of the C Constant in the Brunauer-Emmett-Teller Equation on Water Pre-Adsorbed on Activated Carbon
Author(s) -
D. Mehandjiev,
R. Nickolov
Publication year - 1992
Publication title -
adsorption science and technology
Language(s) - English
Resource type - Journals
eISSN - 2048-4038
pISSN - 0263-6174
DOI - 10.1177/026361749200900105
Subject(s) - chemistry , adsorption , activated carbon , sorption , nitrogen , volume (thermodynamics) , carbon fibers , bet theory , specific surface area , water vapor , constant (computer programming) , thermodynamics , analytical chemistry (journal) , chromatography , organic chemistry , composite number , composite material , physics , materials science , computer science , programming language , catalysis
The dependence of the C constant in the BET equation on the amount of pre-adsorbed water has been investigated by low-temperature nitrogen adsorption on activated carbon containing different amounts of water pre-adsorbed at the same relative water vapour pressure. It is suggested that the rapid decrease in the surface area as determined by the BET method in comparison with the C value in cases of low degrees of sorption volume filling is associated with blocking of part of the carbon texture and the parallel formation of extremely narrow micropores.