添加钙对酚醛树脂基球形炭活化特性及孔结构的影响

Effect of calcium on the activation characteristics and pore structure of phenolic resin-based carbon spheres

将线型酚醛树脂与硝酸钙均匀混合 ,利用乳化法 ,经炭化和活化成功制备出酚醛树脂基球形活性炭 ,利用氮吸附法对所制备活性炭的孔结构进行了研究。结果表明 ,添加钙加快了球形炭的活化速率 ;含钙球形活性炭的微孔比表面积减小 ,但是其孔径分布变化不大 ;含钙球形活性炭具有3～ 4nm之间的优势中孔以及较大的中孔率 ;随着活化烧失率的增大 ,4nm以上的中孔继续增多而 3～ 4nm之间的中孔变化不明显 ,表明含钙球形活性炭的中孔有不同的形成机理。

Phenolic resin based activated carbon spheres (PACS) with high mesopore volume were successfully prepared by the addition of calcium nitrate into the novolac type phenolic resin. N 2 adsorption was used to characterize the pore structure of the prepared PACS. The results show that the calcium enhances the burning rate of the carbon spheres and reduced the micropore surface area with little influence on their pore size distribution. The calcium containing activated carbon spheres have preponderant mesopores 3～4 nm in size and a high mesopore ratio. Continued activation increased the number of mesopores larger than 4 nm; but had little effect on the 3～4 nm size mesopores, which indicated different mechanisms for mesopore evolution in calcium containing activated carbon spheres.