Abstract
Zeolite beta with SiO2/Al2O3 ratios from 30 to 730 was synthesized by a steam-assisted crystallization method, and the crystallized products obtained within 24 h were characterized by means of chemical analyses, XRD, FE-SEM, 29Si-MAS NMR, N2 adsorption, and temperature-programmed decomposition of tetraethylammonium cation occluded in the micropores of zeolite beta. Based on these results, the crystallization mechanism is discussed herein. It was found that agglomerates of nano-particles were formed from a dry gel before the development of a periodical structure in a long-range order, which can be detected by XRD. After several hours of crystallization, morphological changes in nano-particle agglomerates proceeded to give highly crystalline zeolite beta.
Original language | English |
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Pages (from-to) | 1-10 |
Number of pages | 10 |
Journal | Microporous and Mesoporous Materials |
Volume | 56 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2002 Oct |
Keywords
- Crystallization mechanism
- SiO/AlO ratio
- Steam-assisted crystallization
- Zeolite beta
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials