Abstract
ABSTRACT Activated carbons were produced from raw and demineralized Greek lignite under various experimental conditions. Demineralization was accomplished by acid washing of raw lignite, and pore structure of products was estimated by adsorption of N 2 at 77K and of CO 2 at 298K. Demineralization caused a decrease in coal reactivity but the activated products had a high surface area. Activated carbons produced from demineralized lignite at low burn-off were exclusively microporous, and had significant molecular sieving properties to gases, as derived from the uptake curves of CO 2 , CH 4 , O 2 and N 2 at room temperature. Carbon molecular sieves were also produced from activated carbons containing the ash minerals, by employing a method of propylene cracking for coke deposition and pore structure modification. High reaction temperatures resulted in a decrease of the mesopore surface area while the micropore surface area was unchanged. Samples prepared under these conditions had high CO 2 /CH 4 selectivity ratios, exhibiting molecular sieving behavior for gas separations.
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