EFFECTS OF ACTIVATION CONDITIONS ON STRUCTURE AND PERFORMANCE OF ACTIVATED CARBON MICROBEADS

In this paper,the coal tar pitch-based mesophase pitch microbeads (MMB) were activated by chemical activation with KOH in different activation condition. The effects of different activation condition on the structure and performance of activated carbon microbeads were investigated. The results show that both the total pore volume and the mesopore volume of activated carbons increase with the increasing of weight ratio of KOH/MCMB to a maximum respectively,and then decrease with further increase of the weight ratio. And the micropore volume of the activated carbon microbeads remains almost constant. The BET surface areas of activated carbon microbeads increase to maximum and then decrease slightly with in- creasing of weight ration of KOH/MCMB. The results also indicate that activation thim have a little influ- ence on the yield and benzene adsorption capacity of activated carbon microbeads. And both the total pore volume and the mesopore volume proportion of activated carbons increase with the increasing of sctivation temperature. At the same time,the BET surface areas of activated carbon microbeads increase and then de- crease. It can be also discovered that the activated carbon microbeads with bigger total pore volume tend to have higher benzene adsorption capacity.