超大比表面积活性炭纤维对氮的多段吸附机理

MULTI-STAGE ADSORPTION OF NITROGEN ONTO PAN-BASED ACF OF SUPEWLARGE SPECIFIC SURFACE AREA

研究了超大比表面积ACF（K－AcF）对氮的多段吸附机理通过各样品孔径结构（基于DFT）和吸附过程（DR曲线描述）比较分析，探讨不同孔径结构对K－ACF的多段吸附的影响，结合前人工作提出了超大比表面积ACF的多段充填机理，并重点分析了极微孔中的吸附过程（第一吸附段），解释了K-ACF的DR曲线偏离理想DR曲线的原因。

There are some differences betWeen PAN-based ACF with large specific surfacearea (K-ACF) and common ACF(relatively small S.S.A.) in pore structures. The former is of muchmore abundant pore structures than the latter. but these pores, whether in K-ACF or in commonACF, comply with similar distribution rule (discontinuous pore size distributions (PSD)). And thesediscontinuous PSDs lead to multi-stage adsorption of nitrogen onto K-ACF. like common ACF. Thefirst stage in three-stage adsorption is determined from distribution and volume of ultra-micropores,which leads to negative deviations at very low partial pressure in DR plot.