采用KOH活化法从大庆石油焦制得超级活性炭,而后对其进行微孔和中孔的调控.中孔调控采用热处理法,所得超级活性炭的中孔率在85 %以上,比表面积大于1 500 m2/g.同时对热处理后的超级活性炭进行表面硝酸氧化,引入部分含氧官能团.60 min酸处理效果明显,羧基的增加量是20 min酸处理的9倍.处理后的超级活性炭更适合作催化剂载体.微孔的控制采用化学气相炭沉积法(以苯为碳源),所得超级活性炭的微孔率从51 %增加到87 %.对CO2和CH4的分离能力从30 mg/g提升到47 mg/g,具有良好的筛分效果.
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 1 500m^2/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 47 mg/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 60 min is about 9 times as much as that for 20 min oxidation.
New Carbon Materials
Ultra activated carbon
Chemical vapor deposition