Abstract
Adsorption and desorption behavior of carbon spheres prepared from phenol resin under various heat treatment conditions were studied by measuring isotherms of N2 at 77 K and CO2 at 201 K. The pyrolysis of the phenol resinwhich occurs up to 800°C gave the carbon with a BET surface area of about 500 m2/g and the micropore volume ofabout 0.4 cc/g, and no effect of heating atmosphere was observed on gas adsorption-desorption behavior. Thecarbonization above 800°C in a flow of high-purity Ar resulted in slight decreases in surface area and micropore volumeof the resultant carbons, due to shrinkage accompanied by carbonization, and gave irreversible adsorption of N2. Theheat treatment in CO2 above 800°C led to high surface area and large micropore volume which were caused by activation. Linear relations between percentage of weight loss during heat treatment and specific surface areas calculated fromboth N2 and CO2 adsorption were found irrespective of heat treatment atmosphere.
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