催化学报

催化学报 ›› 2008, Vol. 29 ›› Issue (11): 1133-1137.

• 研究论文 • 上一篇    下一篇

测量多孔粉体扩散系数和孔分布的实验装置

宋哲建, 王德峥   

  1. 清华大学化学工程系, 北京 100084
  • 收稿日期:2008-11-25 出版日期:2008-11-25 发布日期:2012-08-17

Experimental Apparatus for Characterizing the Internal Diffusivity of Microporous Powders

SONG Zhejian, WANG Dezheng*   

  1. Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • Received:2008-11-25 Online:2008-11-25 Published:2012-08-17

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摘要： 多孔粉体在介孔和微孔范围内的表征需要专业的实验仪器,这限定了对该类材料全面的表征只能在大型实验室中进行. 本文提出了一种改进的BET测量装置,其核心部件是高精度的压差传感器,这种设备让小型实验室也可以测量多孔粉体的内扩散系数和孔分布. 使用数值解析方法和蒙特卡罗模拟方法分析了测量扩散系数实验的数据.

关键词: 多孔粉体, 扩散系数, 孔分布

Abstract: A BET adsorption apparatus with a high precision differential pressure sensor, which small laboratories can afford, for the use of measurement of internal diffusivity and micropore size distribution (mPSD) of microp orous powders is described. The apparatus is based on gas uptake rate measurem ents and adsorption manometry for measuring internal diffusivity and mPSD.

Key words: microporous powder, diffusivity, micropore size distribution