测量多孔粉体扩散系数和孔分布的实验装置(英文)  

Experimental Apparatus for Characterizing the Internal Diffusivity of Microporous Powders

作　　者：宋哲建[1] 王德峥[1] 

机构地区：[1]清华大学化学工程系,北京100084

出　　处：《催化学报》2008年第11期1133-1137,共5页

基　　金：Supported by the National Basic Research Programof China (2005CB221405);the National Natural Science Foundationof China (20773075)

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.The characterization of the micropore range in porous powders requires sophisticated apparatuses, which limits their thorough characterization to large laboratories. We describe a modification of a BET adsorption apparatus, in which the key instrument is a high precision differential pressure sensor, which even small laboratories can afford, that can be used to measure the internal diffu- sivity and micropore size distribution （mPSD） of microporous powders. The apparatus is based on the conventional gas uptake rate measurement and adsorption manometry for measuring diffusivity and mPSD, respectively. Numerical simulations of the measurement and uptake rate were used to analyze the apparatus.

关 键 词：多孔粉体 扩散系数 孔分布 

分 类 号：TB383.3[一般工业技术—材料科学与工程]