摘要
本文在前文活化工艺研究的基础上,对沥青基不熔化纤维和低温炭纤维在不同活化温度下(800～1000℃)活化产物进行了孔分布及孔结构参数测定,元素分析和X射线衍射分析。结果表明,沥青基活性炭纤维(PACF)含碳丰富,比表面积大,孔分布窄且集中在微孔范围内,其微晶排列较原料紊乱,不熔化纤维较低温炭纤维易活化。在相同活化条件下,不熔化纤维制备的活性炭纤维同低温炭纤维制备的活性炭纤维相比,其平均微孔径较大,碳原子烧蚀率较高,d002较大,Lc,M值较小,且随活化温度升高,d002增加幅度也变大(相应的Lc减少幅度也变大)。这些差异是由于两种原料经不同的活化过程引起的,而且,活化过程中微晶结构的变化对活化效果起着相当重要的作用。
In this paper, a number of physical and chemical measurcments, i. e, the pore size distributions, the pore structural parameters, elemental analyses and the X-ray diffraction of the activated products for pitch-based nonfused and low-temperature carbonized fibres (PACF) at different activating temperatures (800～1000℃) were carried out. The results showed that PACF has rich carbon content, large specific surface area, narrow pore size distribution in the range of the micropore region and lower crystallographic order than starting material. The activation of nonfused fibre is easier than that one. Under the same activating conditions, the activated product of nonfused fibres has larger average micropore diameter, higher carbon burn-off, larger d_(002), lower Lc and M when compared with the activated product of low-temperature carbonized precursor. The increase of d_(002) became larger with the increasing of activating temperature (the decrease of corresponding Lc became larger as well). The reason leading to the above results is the different activating history of two starting materials. It appears that the changes of the microcrystalline structure play a very important role in the activating results.
出处
《炭素技术》
CAS
CSCD
1990年第5期1-6,共6页
Carbon Techniques
