| 测量多孔粉体扩散系数和孔分布的实验装置 |
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| 引用本文： | 宋哲建,王德峥.测量多孔粉体扩散系数和孔分布的实验装置[J].催化学报,2008,29(11). |
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| 作者姓名： | 宋哲建 王德峥 |
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| 作者单位： | 清华大学化学工程系,北京,100084 |
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| 基金项目： | 国家重点基础研究发展规划(973计划)，国家自然科学基金 |
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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.
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| 关 键 词： | 多孔粉体 扩散系数 孔分布 |
Experimental Apparatus for Characterizing the Internal Diffusivity of Microporous Powders |
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| SONG Zhejian,WANG Dezheng.Experimental Apparatus for Characterizing the Internal Diffusivity of Microporous Powders[J].Chinese Journal of Catalysis,2008,29(11). |
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| Authors: | SONG Zhejian WANG Dezheng |
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| Abstract: | 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 diffusivity 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. |
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| Keywords: | microporous powder diffusivity micropore size distribution |
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