Diffusion measurements through embedded zeolite crystals

被引:46
作者
Sun, MS
Talu, O
Shah, DB
机构
[1] Dept. of Chemical Engineering, Cleveland State University, Cleveland
关键词
FREQUENCY-RESPONSE METHOD; SILICALITE MEMBRANE; MOLECULAR-DYNAMICS; SELF-DIFFUSION; SINGLE-CRYSTAL; METHANE; PROPANE; BUTANE; NAX; DIFFUSIVITIES;
D O I
10.1002/aic.690421102
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
For the first time, a macroscopic method was used to measure directly diffusivity of fast diffusing species such as methane in silicalite. A form of Wicke-Kallenbach technique was applied to measure intracrystalline diffusivity. The technique uses a single embedded zeolite crystal as a membrane and a mass-selective detector to determine the transient mass response and hence the diffusion flux passing through the membrane. A concentration-difference driving force is used rather than a pressure-difference driving force. The diffusivities calculated from both adsorption and desorption transients were in excellent agreement, thus providing a check for the self-consistency of the data. The diffusivities of carbon dioxide, methane, ethane, propane and butane in silicalite between 30 and 70 degrees C have been compared with those from the literature. The diffusivities reported here are between those measured with microscopic methods and those measured with other macroscopic methods.
引用
收藏
页码:3001 / 3007
页数:7
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