Abstract
Changes in the specific surface area of two graphitizing-type carbons and four non-graphitizing-type carbons were followed by measuring the values of surface areas estimated from nitrogen adsorption ( S N2 ) at 77°K and carbon dioxide adsorption ( S CO2 ) at 195°K as a function of heat treatment temperature (HTT). Both S N2 and S CO2 , in general, increase with increase of HTT in the lower HTT region, show a maximum or a plateau in the intermediate HTT region and decrease to negligibly small values in the higher HTT region. The graphitizing-type and non-graphitizing-type carbons are distinguished from one another by the sorption behavior of nitrogen and carbon dioxide, and the variation of S Co2 S N2 with HTT. Moreover, the non-graphitizing-type carbons may be divided into two sub-groups according to the values of S Co2 S N2 in the specified HTT range around 700°C.
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