Studies on structure and acid–base properties of high silica MFI-type zeolite modified with methylamine
| Autor: | Yingcai Long, Heyong He, Juan Guo, Yue-Fang Huang, Hui Yu, Ai-Jie Han |
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| Rok vydání: | 2005 |
| Předmět: |
chemistry.chemical_classification
Base (chemistry) Methylamine Inorganic chemistry General Chemistry Condensed Matter Physics Molecular sieve chemistry.chemical_compound Crystallography Adsorption chemistry Mechanics of Materials General Materials Science Orthorhombic crystal system Amine gas treating Zeolite Monoclinic crystal system |
| Zdroj: | Microporous and Mesoporous Materials. 79:177-184 |
| ISSN: | 1387-1811 |
| DOI: | 10.1016/j.micromeso.2004.11.001 |
| Popis: | Investigations with XRD, 13 C and 29 Si MAS NMR, FT-IR, NH 3 –TPD and CO 2 –TPD, nitrogen adsorption, composition analysis and TG/DTG/DTA real that adsorbed methylamine (MA) strongly interacts with the framework of high silica MFI-type zeolite. The interaction results in the structural symmetry of MFI zeolite changing from monoclinic to orthorhombic. At 298 K the H atom of the amine group attacks the [Si–O] framework to form O H N bonds. On raising the temperature to 323 K, the signal belonging to Si–N connection appears in the FT-IR spectrum and 29 Si MAS NMR pattern of the modified zeolite, respectively, showing a linkage of Si–N–Si in the framework. The MA modified MFI zeolite exhibits evident and strong basic properties. |
| Databáze: | OpenAIRE |
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