Bimodal micropore size distribution in active carbons

The porous structure of active carbon was compared with that of the original mineral coal and its carbonization products. The parameters of the porous structure were calculated from the adsorption isotherms of CO₂ (298 K) and H₂O (293 K). It was shown that carbonization of the original coal at 1120 K causes changes in the chemical composition, consolidation of the part which is amorphous to X-rays, generation of an ordered defect-containing structure on its basis, an increase in the volume of the micropores, and a decrease in the mean diameter. Activation of the carbonized coal affords a microporous structure with a bimodal size distribution.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 473–475, March, 1993.