The Research Of Producing High Surface Active Carbon With Petroleum Coke

This experiment mainly summarized the effect of different technics to produce active carbon made of petroleum cokes and the effect of pretreatment to the pore structure of active carbon.Active carbon is produced in the way of beforeland infusing in this experiment. Compared to the normal method of dry mixing,it is shown that BET surface area of active carbon increased with increasing KOH/C ratio. With the low KOH/C ratio,larger BET surface area is obtained in infusing method,however drying mixing method is better with high KOH/C ratio.It is also shown that with decreasing the granularity of petroleum cokes, the BET surface area of active carbon which is made of petroleum cokesPetroleum cokes heat-treated at different temperature were comparatively studied by means of TGA, FTIR, XRD, elemental analysis and gas adsorption, in order to understand the chemical activation process with KOH. The increase of heat treatment temperature (HTT) of the petroleum coke causes a noticeable reduction of BET surface areas and a change of pore size distribution of the final activated product, which is in accordance with the decrease of oxygenous groups of the cokes as is shown by the FTIR. A greater decrease in the microcrystallite thickness Lc after KOH activation was found for the cokes treated at lower HTT, resulting in activated carbon with larger BET surface areas. The microcrystallite thickness Lc of the cokes treated at 110℃is changed from 2.26nm to 0.51nm after KOH activation and the obtained activated carbon has a high BET surface area of 1997m².g^-1 with a narrow micropore size distribution. It can be concluded that the BET surface area strongly depends on active sites, such as C-O, C-O-C, C-O-H and some alkyl groups of petroleum cokes.