Abstract Activated carbons have been prepared from petroleum cokes by the combination of a chemical treatment with HClO4 or H2O2 and a chemical activation with KOH at a constant KOH/coke ratio of 3/1. The influence of different chemical treatments on the properties of the activated carbon precursors and final carbons activated with KOH was invested by using XRD, FTIR, and BET techniques. XRD r…