抄録
The activation of various chars by CO2 gas was carried out. Experimental results are summarized as follows. The pores of activated carbon are formed in two steps. In the first step the content of residual volatile matter in the chars has an important influence on the pattern of development of the micropore and in the second step the macropore volume caused by raw materials and/or their subsequent history of heat treatment is the important influence. The more volatile matter a char contains, the higher the reactivity it exhibits, and the faster the rate of micropore growth. Also, the higher the degree of macropore development in the first step, the more it contributes to micropore formation in the subsequent course of gas activation.
