Interference microscopy as a technique for directly measuring intracrystalline transport diffusion in zeolites

被引：70

作者：

Schemmert, U

Kärger, J

Weitkamp, J

机构：

[1] Univ Leipzig, Fak Phys & Geowissensch, D-04103 Leipzig, Germany

[2] Univ Stuttgart, Inst Tech Chem 1, D-70550 Stuttgart, Germany

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 1999年 / 32卷 / 1-2期

关键词：

diffusion in zeolites; interference microscopy; intracrystalline mass transport;

D O I：

10.1016/S1387-1811(99)00095-5

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

A detailed description of the application of interference microscopy to measure intracrystalline transport diffusion in zeolites is given. It is demonstrated how phase differences as the primary data of interference microscopy may be transferred into information about intracrystalline concentration profiles and their evolution with time. As an example, molecular uptake of methanol in zeolite NaCaA is considered. The concentration profiles along the crystallite diagonal are given at different instants of time. Finally, the range of diffusivities obtained by applying the microscopic version of Fick's second law to the concentration data is presented. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：101 / 110

页数：10

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