炭分子筛的制备及表面结构

The ultra activated carbon with a surface area of more than 3 000 m2/g was obtained from Daqing petroleum coke by KOH activation. The effects of the ratio of alkali to carbon, the activation temperature and the activation time on the adsorption properties were investigated, and the preparation parameters were optionized (KOH∶C=4∶1,activation temperature:800 ℃,activation time:2 h). A carbon molecular sieve with a mesopore ratio>85% and SBET>1 500 m2/g was then obtained from the UAC through heat-treatment; HNO3 oxidization was employed to make CMS with acid strength distribution on the surface being appropriate (150 ℃～240 ℃ weakly acid, 240 ℃～340 ℃ middle strong acid, 340 ℃～450 ℃ strong acid). This novel CMS with wider distribution in acidity is of potential in catalyst. Because better acidities distribution can intensify the strength between supports and metal ions and increase the loadings, CMS post oxidation is more suitable for being catalyst supports.