Pore volume and macropore-size distribution of charcoal produced from the wood of a wide variety of trees were measured by mercury intrusion porosimetry and the following results were obtained.The shape of the distribution curve was remarkably dependent on wood type. Total pore volume of charcoal produced by carbonizing at high temperature was less than that of charcoal produced by carbonizing at low temperature. Total pore volume of coniferous tree charcoal exceeded that of broad-leaf tree charcoal. Total pore volume of molding charcoal wassmall, eventhough it came from the coniferous tree. Total pore volume of coconut shell charcoal and Kashioak charcoal was small, since these charcoal types are hard. The distribution curves of coconut shell, coconut shell charcoal, and coconut shell activated carbon were resemble, but the pore volume of the coconut shell was smaller than the others. Total pore volume increased in proportion to that of large pores.
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Abe et al. (1996) studied this question.