2D–3D structures: The hydrothermal transformation of a layered sodium silicate, Na-RUB-18, into mordenite zeolite
| Autor: | Francisca S. O. Ramos, Heloise O. Pastore, Erica C.O. Munsignatti |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Silicon Inorganic chemistry chemistry.chemical_element Sodium silicate General Chemistry Condensed Matter Physics Silicate Hydrothermal circulation Mordenite Crystallography chemistry.chemical_compound Crystallinity chemistry Mechanics of Materials Aluminium General Materials Science Zeolite |
| Zdroj: | Microporous and Mesoporous Materials. 177:143-150 |
| ISSN: | 1387-1811 |
| Popis: | The synthesis of the high-silica mordenite zeolite by hydrothermal transformation of the Na-RUB-18 layered silicate was conducted by the addition of Al[OCH(CH3)2]3 or Na2Al2O4 into the gel after 7 days of hydrothermal treatment of a non-aluminum gel. Extensive characterization showed that the samples were obtained in good crystallinity in periods varying from 7 to 14 days after the addition of the aluminum source when Al[OCH(CH3)2]3 was used and after 14 days for Na2Al2O4. Results of 29Si and 27Al NMR suggest a gradual transformation of Na-RUB-18 into MOR by the appearance of signals which correspond to silicon atoms coordinated to 1and 2 Al and one signal corresponding to tetrahedrally coordinated aluminum atoms, both nonexistent in Na-RUB-18. |
| Databáze: | OpenAIRE |
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