Recrystallization on Alkaline Treated Zeolites in the Presence of Pore-Directing Agents
| Autor: | Christian Fernandez, Bert F. Sels, Shrikant M. Kunjir, Eddy Dib, Nicolas Nuttens, Danny Verboekend, Aurélie Vicente, Hussein El Siblani |
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| Přispěvatelé: | Laboratoire catalyse et spectrochimie (LCS), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven) |
| Rok vydání: | 2018 |
| Předmět: |
Recrystallization (geology)
Materials science 02 engineering and technology General Chemistry Nuclear magnetic resonance spectroscopy engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Coating Chemical engineering Homogeneous engineering [CHIM]Chemical Sciences General Materials Science 0210 nano-technology Zeolite Dispersion (chemistry) Mesoporous material ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Crystal Growth & Design Crystal Growth & Design, American Chemical Society, 2018, 18 (4), pp.2010--2015. ⟨10.1021/acs.cgd.7b01416⟩ |
| ISSN: | 1528-7505 1528-7483 |
| Popis: | In previous works aiming at understanding the mesoporous network after alkaline treatment in the presence of organic additives, conventional bulk characterization techniques led to the conclusion that the dissolved zeolite does not undergo any kind of recrystallization [Verboekend, D., Cryst. Growth. Des. 2013, 13, 5025−5035]. Here for the first time, we demonstrate using the data obtained from 1H and 129Xe NMR spectroscopy that such recrystallization does occur, which leads to the formation of a very thin coating of the mesopore walls. This demonstration is done on a beta (BEA) zeolite treated in the presence of TPA+ in an alkaline solution. The formation of a small amount of nanosized crystals or embryonic phases of silicalite-1 (MFI) zeolite is evidenced, as well as their homogeneous dispersion on the mesoporous surface of the beta zeolite. We think that these results may explain why a homogeneous mesopore size distribution is obtained, when organic pore-directing agents are used in the zeolite hierarc... |
| Databáze: | OpenAIRE |
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