| Autor: |
Hans Lechert, H. J. Hennig, Schukufeh Mirtsch |
| Rok vydání: |
1974 |
| Předmět: |
|
| Zdroj: |
Surface Science. 43:88-100 |
| ISSN: |
0039-6028 |
| Popis: |
Model-calculations show that the surface of the cavities of zeolites of the faujasite-type for low Si/Al ratios can be described by a picture of many flat potential holes and for high Si/Al ratios by the picture of a few deep potential holes near the cations of the large cavities. In the present paper this model is checked by measuring the proton resonance of substances with different shape and polarity. It can be shown that this model is suitable for the description of the behaviour of the line widths of substances with a permanent dipole moment like ethylether and tetrahydrofurane and also for substances with an induced dipole moment like benzene. The two dipoles of dioxane lead to a strong increase of the line widths in the samples with low Si/Al ratio. At high coverages effects of the limited volume of the holes on the mobility of the cations can be observed. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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