分子筛晶内扩散系数测定方法的研究进展

Research advance in the measurement of intracrystalline diffusivities in zeolites

表征沸石分子筛晶内扩散的基础理论和实验技术的发展,对促进沸石分子筛的深入研究及其在催化、吸附领域的应用具有十分重要的意义。本文较全面地评述了国内外沸石分子筛晶内扩散系数测定领域的研究现状。介绍了分子筛晶内扩散系数的基本分类及其影响因素;在此基础上综述了国内外测定晶内扩散系数的各种方法以及每种方法的优缺点。两类测定方法中,宏观法在工业领域应用广泛,微观法则适合于理论研究。最后,简要比较了晶内扩散系数多种方法的测定结果并对其发展方向进行了展望。

Fundamental theory and experimental technology of intracrystalline diffusion characterization are greatly significant in research of zeolites and their application in catalysis and adsorption field.This review summarizes the intracrystalline diffusivity measurements worldwide.Classification and influence factors of intracrystalline diffusion are introduced.Strengths and weaknesses of these methods are analyzed and different characterization results are compared.Macro-method is suitable for industry research,while micro-method possesses advantages in theoretical research.Finally,the development trend and challenge in intracrystalline diffusivity characterization are proposed.