Abstract
The specific surface areas of two sub-bituminous coking coals and their carbonization products have been evaluated from the adsorption isotherms of methanol, benzene, cyclohexane and nitrogen. The specific surface area increases with carbonization temperature and reaches a maximum at about 600°C. Cokes prepared at temperatures above 800°C possess much lower surface areas due probably to sealing off of the micropore system. The coals and cokes exhibit molecular sieve effect, the specific surface area calculated from the adsorption data of methanol being much higher than the area derived from the adsorption of benzene and cyclohexane, except for cokes prepared above 900°C. The adsorption of nitrogen is an activated diffusion process. Zinc chloride activation produces cokes of much greater specific surface area.
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