双气路色谱法测定固体比表面积的特点

THE SPECIFIC OF DETERMINATION OF SPECIFIC SURFACE AREA BY THE DUAL FLOW CHROMATOGRAPHY

本文介绍了以双气路色谱法为原理的ST-03型比表面和孔径测定仪的特点。以及仪器的稳定时间、样品管插入液氧深度、平衡气总流速、液氮饱和蒸气压、相对压力范围等因素对固体表面积测定的影响。同时相应提出了降低影响的建议。

In this paper, specifics of the instrument of model ST-03 for determination specific surface area and pore size distribution based on principle of a dual gas flow system was given. Some factors which have influnce on measument accuracy of solid specific surface area were showed, such as stability period for the instrument, depth of sample tube immersed in liquid nitrogen, tatol flow rate of gases for adsorption equilibrium, saturation pressure of nitrogen, range of relation pressure of nitrogen. Some measures to reduce the influnce was susgested.