| 摘要 |
PROBLEM TO BE SOLVED: To obtain adsorption performances favorable for use in a vapor discharge controller for adsorbing gasoline vapor and excellent mechanical strength and abrasion resistance by providing an active carbon with adsorptivity of a specific value or above of butane working capacity and regulating the wear rate to a specific value or below. SOLUTION: This active carbon has >=12 g/100 cm3 butane working capacity and <=1.5% wear rate. The active carbon preferably has >=1,500 m2/g surface area, 20-40 Å average pore diameter, 50-95 JIS hardness, <=10% ignition residue and 0.2 to >=0.5 g/cm3 bulk density. The method for producing the active carbon is not especially limited; however, a polyhydric alcohol (e.g. glycerol) in an amount of 1-30 wt.% based on a dried solid material and expressed in terms of mixing ratio to the carbonaceous raw material is added at the time of kneading when mixing and kneading the carbonaceous raw material (e.g. wood flour) with a chemical activator (e.g. zinc chloride), then granulating, molding, heating and baking the resultant kneaded mixture to 500-700 deg.C and thereby producing the active carbon. |
