Activated carbons prepared from thermally and chemically treated petroleum and coal tar pitches

摘要

Petroleum and coal tar pitches have been treated thermally at 400 deg C and 470 deg C, extracted with toluene and subsequently activated with CO_2 at 900 deg C. With one exception, the development of the micropore widths and volumes inthe resulting carbons follows the trend observed for carbons based essentially on precursors of vegetable origin. On the other hand, petroleum pitch treated at 400 deg C leads to an active carbonwhich follows the pattern observed for cokes, semi-cokes and pyrolyzed tyres. It is suggested that the difference between the two types of active carbons is due to the large amount of componds with low molecular weight left inthe petroleum pitch after thermal soaking.