Модифікування зовнішньої поверхні цеолітних кристалів – шлях до підвищення їх каталітичної ефективності
Selective isomorphous substitution of silicon for outer surface aluminum of NaX zeolite crystals with silicon using SiCl4 as modifying agent has been shown to succeeds to increase essential by the regeneration- free work duration of HLaCaNaX sample on the base of modified NaX in isobutene with isobu...
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| Datum: | 2008 |
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| Hauptverfasser: | , , , |
| Format: | Artikel |
| Sprache: | Ukrainisch |
| Veröffentlicht: |
Chuiko Institute of Surface Chemistry National Academy of Sciences of Ukraine
2008
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| Online Zugang: | https://surfacezbir.com.ua/index.php/surface/article/view/301 |
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| Назва журналу: | Surface |
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Surface| Zusammenfassung: | Selective isomorphous substitution of silicon for outer surface aluminum of NaX zeolite crystals with silicon using SiCl4 as modifying agent has been shown to succeeds to increase essential by the regeneration- free work duration of HLaCaNaX sample on the base of modified NaX in isobutene with isobutene alkylation. Modification prevents forming the outer surface acidity during the ion exchange of NaX towards HLaCaNaX what results in the sharp decreasing the outer surface coke formation at the expense of raw isobutene as well as at the expense of unsaturated fragments of alkylation product molecules which crack on the outer surface acid sites. As a result the coke less blockades the entries to the zeolite cavities what favours more complete realizing the inner cavity zeolite catalytic activity. (NH4)2SiF6 was found to be a less efficient modifying agent. |
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