Abstract
Activated carbons were prepared from an Australian bituminous coal in this study. The preparation process consisted of phosphoric acid impregnation followed by carbonization in nitrogen at 400–600°C for 1–3 hours. The results reveal that the surface area and pore volume of the resulting carbons increase with the chemical ratio, H 3PO 4/coal. Within the ranges of carbonization temperature and time, the chemically activated carbon prepared from carbonization at 500°C for 3 hours was found to have maximum surface area and pore volume values. Physical activation with CO 2 of the initially H 3PO 4 activated carbon was examined and the results suggest that the combined activation is suitable for producing high porosity carbons with a high proportion of mesoporosity.
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