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Centimeter-sized zeolite bodies of intergrown crystals: Preparation, characterization and study of binder evolution
- Source :
-
Microporous & Mesoporous Materials . Feb2011, Vol. 138 Issue 1-3, p157-166. 10p. - Publication Year :
- 2011
-
Abstract
- Abstract: The control of the inter-particle porosity in polycrystalline zeolite bodies remains a challenge. The present study reports on the preparation of centimeter-sized zeolite bodies (32×2mm pellets) with reduced inter-particle porosity. The bodies were prepared by assembling zeolite colloidal nanocrystals with monomodal particle size distribution and sub-colloidal aluminum hydroxide binder. A secondary growth treatment under hydrothermal conditions was performed in order to fill up the inter-particle voids and obtain polycrystalline zeolite materials with textural characteristics close to those of single zeolite crystals. Initial material, intermediates and ultimate product were studied with a combination of complementary methods revealing a substantial reduction even an elimination of the inter-particle porosity. Particular attention was paid to the chemical evolution of the binder and the migration of aluminum species, employing X-ray powder diffraction, 27Al-MAS, 27Al-3QMAS NMR and X-ray fluorescence spectroscopy analyses. Evidences for insertion of aluminum from the binder into the zeolite framework during secondary growth step were found. Consequently the ultimate pellets comprised aluminum-rich zeolite beta crystals and very low binder content. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13871811
- Volume :
- 138
- Issue :
- 1-3
- Database :
- Academic Search Index
- Journal :
- Microporous & Mesoporous Materials
- Publication Type :
- Academic Journal
- Accession number :
- 55059810
- Full Text :
- https://doi.org/10.1016/j.micromeso.2010.09.011