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化学学报
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化学学报 ›› 1990, Vol. 48 ›› Issue (5): 424-430. 上一篇    下一篇

研究论文

比表面积和孔径分布测定与计算方法的改进

关岳;孙钦廉;邬行彦;卢珊;陈虹   

  1. 华东化工学院生化工程系
  • 发布日期:1990-05-15

Improvements of determination and calculation of specific surface area and pore distribution

GUAN YUE;SUN QINLIAN;WU XINGYAN;LU SHAN;CHEN HONG   

  • Published:1990-05-15

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本文比较了BET多层吸附模型, Pickett有限层吸附模型以及Dubinin微孔填充模型, 并在此基础上, 假定多层吸附和微孔填充两种过程同时发生, 导出一个修正的吸附方程式, 并说明修正后的方程具有较大的适用性和准确性, 在孔径分布的测定中, 用H2替代He作为载气, 大大降低测定成本, 应用微机实现数据运算过程微机化和结果的图谱化, 大大缩短处理时间。

关键词: 计算方法, 氮, 氢, 计算机应用, 比表面积, 吸附方程, 孔径分布

A comparison between the Brunauer-Emmett-Teller adsorption equation, the G. Pickett (1945) adsorption equation, and the M. Dubinin (1947) micropore filling equation is made. Based on the assumption that multilayer adsorption and micropore filling occur simultaneously, a modified adsorption equation is derived. Comparison with experimental data shows that the modified equation is more accurate and is applicable over a wider range of pore radii. The cost of determing the pore distribution can be lowered greatly by using H instead of He as the carrier gas and the processing time can be reduced remarkably with the help of a computer.

Key words: COMPUTATIONAL METHOD, NITROGEN, HYDROGEN, COMPUTER APPLICATIONS, SPECIFIC SURFACE AREA, ADSORPTION EQUATION, PORE SIZE DISTRIBUTION

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