炭素前驱体性质对活性炭比表面积的影响

EFFECTS OF PROPERTIES AND STRUCTURE OF PRECURSOR ON SPECIFIC SURFACE AREA OF ACTIVED CARBON

煤沥青由于软化点低,挥发分含量高等特点,不易直接用于制备活性炭,实验采用空气氧化热聚合方法对煤沥青进行稳定化处理.为考察炭素前驱体的结构、性能对由其所制备的活性炭的比表面积的影响,实验以不同升温速率加热煤沥青进行热聚合处理,并将得到的前驱体制备成活性炭.结果表明,在本实验条件下得到的前驱体的挥发分含量、甲苯不溶物含量差异较小,对活性炭比表面积影响不大,而其结构对活性炭比表面积影响较大.其中含有中间相小球的前驱体最利于制得高比表面活性炭,镶嵌型结构的次之,而区域型结构相对不利于得到高比表面积活性炭.

Coal-tar pitch isn＇t prone to be prepared into actived carbon directly because of low softening point and high volatile component content. Ther.mal polymerization with air blowing were carried to pretreat coal-tar pitch in this experiment. In order to study the effect of properties and structure of precursor on specific surface area of actived carbon,coal-tar pitch was thermally treated into precursors at different heating rate, then prepared actived carbons from these precursors. The results showed there is little difference between volatile component content of precursors, TI content does so,and which have no more influence on specific surface area of active carbon. However, the structure of precursor has great impact on it. Mesophase spheres in precursor do benefit to making high specific surface area actived carbon, mosaic structure take second place, regional structure do not benefit to making high specific surface area actived carbon.