摘要
为进一步改善工业半焦的孔隙结构,增强吸附性能,对两种工业半焦样品进行了水蒸气活化实验并运用Pore Master-60型孔隙度分析仪对样品活化前后的孔隙结构进行了分析。分析结果表明,工业半焦经过水蒸气活化之后孔隙进一步发展,结构趋于完善合理。2个样品的压汞法分析比表面积和注汞体积分别是活化前的4倍和3倍多;样品经过活化之后微孔容积和比表面积明显增多,孔半径小于10nm的注汞体积百分数较活化前增大1倍多,显示出活化过程的造孔、通孔作用大于扩孔作用。活化样品在孔半径为3nm附近形成孔的密集分布。通过对样品的分形维数进行计算分析表明,工业半焦活化前后均具有分形特征,活化样品的分形特征更为显著,分形维数进一步增大。
To improve the pore structure and enhance adsorption capability of semi-cokes, two industrial semi-coke samples were activated with water steam and then tested with PoreMaster-60. The results indicate that the pore structure of the samples is developed and more perfect after activation. The intruded volume and specific surface area of activated samples are about 4 times or 3 times of original samples respectively. The intruded volume and the specific surface area of micropore increase more remarkably than those of larger radius pores. The intruded volumes of pores with radius of less then 10nm are about two times of those of the original samples. The radiuses of the most pores are around 3nm in activated samples. Samples are of fractal characteristic whether activated or not, but the fractal characteristic of activated samples is more remarkable than the original samples, and have larger calculated fractal dimensions.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2008年第2期14-19,共6页
Proceedings of the CSEE
关键词
半焦
孔隙结构
比表面积
注汞体积
分形维数
semi-coke
pore structure
specific surface area
intruded volume
fractal dimension
