Abstract: To measure the specific surface area of pore materials, N₂adsorption method was applied to analyze the pore structure of samples with pore diameters from 0.5 to 40 nm. The specific surface areas of these samples were obtained by the multi-point BET method. The results show that the ranges of relative pressure are closely related to the pore diameter of samples by the multi-point BET method. The relative pressure is in the range of 0.01 to 0.1 for microporous materials. The relative pressure is in the range of 0.05 to 0.2 for mesoporous materials with the pore diameter less than 4 nm. The relative pressure is in the range of 0.05 to 0.3 for mesoporous materials with the pore diameter larger than 4 nm. For hierarchical molecular sieves, the relative pressure value range should be determined according to their types and pore structure characteristics.

Keywords : pore materials; multi-point BET method; specific surface area; relative pressure; pore structure

中图分类号：O611.2           文献标志码：A

文章编号：1008-5548（2014）04-0068-06

DOI:10.13732/j.issn.1008-5548.2014.04.016

收稿日期：2013-09-24， 修回日期：2013-10-21，在线出版时间：2014-08-28。

基金项目：国家自然科学基金项目，编号：21206017。

第一作者简介：刘丽萍（1972—），女，博士，工程师，研究方向为催化剂合成与表征。 E-mail:liuliping@dlut.edu.cn。