Effects of low-temperature gel aging on the synthesis of zeolite Y at different alkalinities

The effects of low-temperature gel aging on the synthesis of zeolite Y were investigated. The variations occurring in the crystal sizes and size distribution as well as in the crystallinity and Si/Al ratio of the solid zeolite samples with aging time were determined for two different aging temperatu...

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Bibliographic Details
Published in:Journal of crystal growth 2002-06, Vol.241 (4), p.481-488
Main Authors: KÖROGLU, H. Jülide, SARIOGLAN, Alper, TATHER, Melkon, ERDEM-SENATALAR, Ayse, SAVASCI, Ö. Tunc
Format: Article
Language:English
Subjects:
A1. Aging
A1. Nucleation
A2. Hydrothermal crystal growth
B1. Zeolites
Chemistry
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
General and physical chemistry
Growth from solutions
Ion-exchange
Materials science
Methods of crystal growth
physics of crystal growth
Physics
Surface physical chemistry
Zeolites: preparations and properties
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Summary:The effects of low-temperature gel aging on the synthesis of zeolite Y were investigated. The variations occurring in the crystal sizes and size distribution as well as in the crystallinity and Si/Al ratio of the solid zeolite samples with aging time were determined for two different aging temperatures and two gel compositions in which the alkalinity was varied. It was determined that both the crystal sizes and the span of the size distribution may be decreased further by aging the gel at temperatures below room temperature. The alkalinity of the gel composition seemed to play a significant role in determining the magnitude of the effects of lowering the aging temperature on crystal sizes and the size distributions of the aged zeolite samples. The Si/Al ratio of zeolite Y was enhanced when the lower aging temperature and the less alkaline gel composition were used.
ISSN:0022-0248
1873-5002
DOI:10.1016/S0022-0248(02)01321-0