The development of porosity in heat-treated polymer carbons upon activation by carbon dioxide

✍ Scribed by Brian McEnaney; Norman Dovaston

• Publisher: Elsevier Science
• Year: 1975
• Tongue: English
• Weight: 561 KB
• Volume: 13
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(75)90054-8

✦ Synopsis

A series of microporous carbons was prepared from cellulose triacetate by heat-treatment in the range 1230-2275'K and a parallel series of carbons was prepared by activation of members of the heat-treated series to 30% burn-off by reaction with carbon dioxide. The changes in porosity with heat-treatment temperature (HTT) were investigated by adsorption of carbon dioxide in the range 195-248°K and by measurement of mercury densities. By comparing porosity in unactivated and activated carbons the extents to which closed porosity can be recovered and open porosity developed by activation were investigated as a function of HTT. The predominant effect of heat-treatment was found to be conversion of open micropores to closed micropores with little change in total pore volume. Activation of 1230 and 1475°K carbons is confined almost entirely to development of micropores. With increasing HTT (meso-t macro-) pore development increases on activation while development of open micropores and opening of closed micropores become less significant.