Journal
CARBON
Volume 41, Issue 9, Pages 1793-1800Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0008-6223(03)00149-0
Keywords
porous carbon; carbonization, activation; adsorption; microporosity
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Carbon nutshells and hydrolytic lignin were used as starting materials for the preparation of microporous active carbons. Optimum parameters for cedar nutshell carbonization have been selected (temperature of carbonization 700-800 degreesC, rate of heating less than 3 degreesC/min) for the preparation of microporous carbons (average pore width 0.56 nm). The textural characteristics of microporous carbons made from nutshell are similar to those of a 'Coconut' carbon molecular sieve, but the latter has both a higher CO2 adsorption capacity and a higher coefficient of N-2/O-2 separation. The influence of carbonization and steam-activation parameters on the microtexture and molecular-sieve properties of granular carbons made from hydrolytic lignin was also investigated. A low rate of heating (less 3 degreesC/min) promotes the formation of micropores with average sizes around 0.56-0.58 nm at carbonization temperature 700 degreesC. At the same carbonization temperature the average sizes of micropores were 0.7-0.78 nm at rates of heating more than 3 degreesC/min. The activation of lignin-char with steam at 800 degreesC resulted in the formation of active carbons with more developed micropore volume (0.3-0.35 cm(3) g(-1)) and with micropores of widths around 0.6-0.66 nm which are able to separate He from a He-CH4 mixture. The size of the micropores was varied as a function of burn off value. (C) 2003 Elsevier Science Ltd. All rights reserved.
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