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3D Study of the Morphology and Dynamics of Zeolite Nucleation |
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| Authors: | Dr Georgian Melinte Dr Veselina Georgieva Dr Marie‐Anne Springuel‐Huet Dr Andreï Nossov Prof Ovidiu Ersen Dr Flavien Guenneau Prof Antoine Gedeon Dr Ana Pal?i? Dr Krassimir N Bozhilov Dr Cuong Pham‐Huu Prof Shilun Qiu Dr Svetlana Mintova Dr Valentin Valtchev |
| Affiliation: | 1. IPCMS UMR7504 CNRS, Université de Strasbourg, 23, rue du Loess BP 43, 67034 Strasbourg (France);2. LCS, ENSICAEN, University of Caen ‐ CNRS, 6, Bd Maréchal Juin, 14000 Caen (France);3. Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), Sorbonne Universités, UPMC Univ Paris 06, CNRS, Collège de France, 11, place Marcelin Berthelot, 75005 Paris (France);4. Central Facility for Advanced Microscopy and Microanalysis, University of California, Riverside, 900 University Avenue, Riverside, CA 92521 (USA);5. ICPEES, ECPM, Université de Strasbourg, 25, rue Becquerel, 67087 Strasbourg (France);6. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, 2699 Qianjin Street, Changchun, Jilin 130012 (P.R. China) |
| Abstract: | The principle aspects and constraints of the dynamics and kinetics of zeolite nucleation in hydrogel systems are analyzed on the basis of a model Na‐rich aluminosilicate system. A detailed time‐series EMT‐type zeolite crystallization study in the model hydrogel system was performed to elucidate the topological and temporal aspects of zeolite nucleation. A comprehensive set of analytical tools and methods was employed to analyze the gel evolution and complement the primary methods of transmission electron microscopy (TEM) and nuclear magnetic resonance (NMR) spectroscopy. TEM tomography reveals that the initial gel particles exhibit a core–shell structure. Zeolite nucleation is topologically limited to this shell structure and the kinetics of nucleation is controlled by the shell integrity. The induction period extends to the moment when the shell is consumed and the bulk solution can react with the core of the gel particles. These new findings, in particular the importance of the gel particle shell in zeolite nucleation, can be used to control the growth process and properties of zeolites formed in hydrogels. |
| Keywords: | crystal engineering crystal growth nanoparticles NMR spectroscopy zeolites |
