气相色谱法测定分子筛扩散系数

Determination of Molecular Sieve Diffusivity by Gas Chromatography

气相色谱法测定分子筛扩散系数是根据色谱VanDeemeter过程，将被测分子筛装人色谱柱中，以测得的色谱往理论板高度（H）和相应的线速度（u）作图，求得在高线速度部分的斜率（C），计算分子筛的扩散系数（Dp）。本文测定了8种5A型和4种13X型分子筛对氧和氛的扩散系数，证明用不同制各方法得到的产品其扩散系数有很大的差异，故其应用的工艺条件亦不应雷同。

This method for determination of the diffusivity of molecular sieves is based on gas chromatographyvan Deemeter equation. In this method,mo1ecular sieves sample is filled into the GC column and the ab-sorbate injected to it,and then theoretical plate height (H) of the GC column is calculated from the GCpeak area. According to H vs linear velocity (C) curve the slope is obtained and the diffusivity (Dp)determined- This paper is involved in various diffusivities of oxygen or nitrogen in 8 kinds of 5A and 4kinds of l3X molecular sieves. The results show that the diffusivites of different samples are different.The method may be app1ied to 0ther absorbates and catalysts,and also to the measurement under differ-ent temperatures.