摘要: Heat treatment (HTT), chemical vapor deposition (CVD) and HNO3 oxidation were employed to modify the surface and pore structure of ultra activated carbon (UAC) prepared from Daqing petroleum coke using KOH as an activating agent. It was found that the surface area and mesopore ratio of UAC can reach more than 1500m2/g and 85% respectively by HTT while micropore ratio of UAC increase from 51 to 87% by CVD using benzene as a carbon source. The UAC modified by CVD also show an enhanced molecular sieving capability manifested by enhanced adsorption for CO2 over CH4 from 30 to 47mg/g. Oxygen-containing surface groups were introduced by HNO3 oxidation, and the number of carboxyl functional groups on the surface of UAC after HNO3 oxidation for 60min is about 9 times as much as that for 20min oxidation.