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Article Dans Une Revue Chemistry - A European Journal Année : 2015

3D Study of the Morphology and Dynamics of Zeolite Nucleation

Georgian Melinte
  • Fonction : Auteur
Veselina Georgieva
  • Fonction : Auteur
Krassimir N. Bozhilov
  • Fonction : Auteur
Svetlana Mintova

Résumé

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.

Domaines

Matériaux

Dates et versions

hal-01275044 , version 1 (16-02-2016)

Identifiants

Citer

Georgian Melinte, Veselina Georgieva, Marie-Anne Springuel-Huet, Andrei Nossov, Ovidiu Ersen, et al.. 3D Study of the Morphology and Dynamics of Zeolite Nucleation. Chemistry - A European Journal, 2015, 21 (50), pp.18316-18327. ⟨10.1002/chem.201501919⟩. ⟨hal-01275044⟩
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