ACTIVE CARBON OF HIGH CONDUCTIVITY AND ITS PRODUCTION

PROBLEM TO BE SOLVED: To obtain active carbon of high conductivity and to recover gas adsorption performance in a short time by a method in which in a substance applicable to the desorption of adsorbed gas by resistance heating, active carbon is heated at a graphatization temperature or above to grow graphite crystals. SOLUTION: In the production of active carbon of high conductivity applicable to a fuel gas divergence preventing canister for automobiles, active carbon produced from wood, coal, and others is heated in an atmosphere of inactive gas such as nitrogen. A heating temperature is at least the graphatization temperature of active carbon, and a heating time is preferably 3 hr or shorter. Graphite crystals grow in active carbon, reducing its electric resistance. In order to increase conductivity, preferably, after conductive powder of carbon such as carbon black and metal such as Cu and Ni is adhered to active carbon through a carbonaceous substance such as creosote oil, the active carbon is heat-treated.