The synthesis of large crystals of zeolite Y re-visited

The major synthesis routes described in the literature so far for zeolite Y (FAU) with an elevated n Si/ n Al-ratio and larger crystallite sizes were systematically re-investigated. Syntheses in the presence of triethanolamine with or without added bis(2-hydroxyethyl)dimethylammonium chloride yielde...

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Vydané v:Microporous and mesoporous materials Ročník 83; číslo 1; s. 333 - 344
Hlavní autori: Berger, Christine, Gläser, Roger, Rakoczy, Rainer A., Weitkamp, Jens
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Amsterdam Elsevier Inc 01.09.2005
Elsevier
Predmet:
Ageing
Chemistry
Co-templates
Colloidal state and disperse state
Crown ethers
Exact sciences and technology
Faujasite (FAU)
General and physical chemistry
Ion-exchange
Large crystals
Porous materials
Surface physical chemistry
Synthesis
Triethanolamine (TEA)
Zeolite Y
Zeolites: preparations and properties
Faujasite (FAU)
Synthesis
Triethanolamine (TEA)
Crown ethers
Large crystals
Ageing
Co-templates
Zeolite Y
Crystals
Crown compound
Zeolite
Molecular sieve
Template
Quaternary ammonium compound
Faujasite
Sodium fluoride
ISSN:1387-1811, 1873-3093
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Popis
Shrnutí:The major synthesis routes described in the literature so far for zeolite Y (FAU) with an elevated n Si/ n Al-ratio and larger crystallite sizes were systematically re-investigated. Syntheses in the presence of triethanolamine with or without added bis(2-hydroxyethyl)dimethylammonium chloride yielded large crystals (10–100 μm) of faujasite-type zeolites. However, only products with low n Si/ n Al-ratios below 1.8 were obtained, and zeolite P was an inevitable side product or even the main product. Furthermore, the outcome of these syntheses was poorly reproducible. Following another known literature procedure, phase-pure zeolite Y could be obtained with the cyclic polyether 15-crown-5 as a structure-directing agent. The influence of ageing, homogenization and seeding of the synthesis gel, the crystallization time and temperature, different Si- and Al-sources and the addition of NaF as a mineralizer or of co-templates such as triethanolamine, ethylene glycol or 1,3,5-trioxane on the resulting product was investigated. A carefully optimized procedure led to large crystals of highly phase-pure zeolite Y with well defined octahedral morphology and a narrow crystal size distribution in the range of 4–5 μm. Such crystals can be reproducibly synthesized in high yields with an n Si/ n Al-ratio of 3.4–4.0. Neither crystallization seeds nor an ageing of the synthesis gel before hydrothermal crystallization are required.
ISSN:1387-1811
1873-3093
DOI:10.1016/j.micromeso.2005.04.009