| Autor: |
Aramburo, L.R., Ruiz-Martinez, J., Hofmann, J.P., Weckhuysen, B.M. |
| Přispěvatelé: |
Inorganic Chemistry and Catalysis, Sub Inorganic Chemistry and Catalysis |
| Jazyk: |
angličtina |
| Rok vydání: |
2013 |
| Předmět: |
|
| Popis: |
Confocal fluorescence microscopy has been used in combination with bulky non-reactive dyes (i.e. proflavine, stilbene and nile blue A) and two staining reactions (i.e. fluorescein synthesis and 4-fluorostyrene oligomerisation) to study the effect of steaming on pore accessibility and acidity of large ZSM-5 zeolite crystals. This approach enabled the 3-D visualization of cracks and mesopores connected to the outer zeolite surface as well as mesoporous ‘‘cavities’’ within steamed ZSM-5 zeolite crystals. It has been found that besides the generation of mesoporosity steaming makes the boundaries between the different crystal sub-units accessible for bulky molecules. Additionally, the fluorescein staining reaction reveals prominent formation of structural defects that are connected to the surface of the crystal via the microporous ZSM-5 system and which contain either Brønsted or Lewis acid sites. On the other hand, the 4-fluorostyrene staining reaction shows how mild steaming conditions increase the accessibility towards the Brønsted acid sites, while under severe steaming conditions the Brønsted acidity contained in the internal crystal sub-units is more accessible, although it is preferentially removed close to the surface of the lateral sub-units of ZSM-5 zeolite crystals. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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