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Synthesis of molecular sieves from Chilean kaolinites: 1. Synthesis of NaA type zeolites

✍ Scribed by Vilma Sanhueza; Ursula Kelm; Ruby Cid

Publisher
Wiley (John Wiley & Sons)
Year
1999
Tongue
English
Weight
345 KB
Volume
74
Category
Article
ISSN
0268-2575

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✦ Synopsis

The synthesis of NaA type zeolites has been studied at autogenous pressure using Chilean kaolins as starting materials. The ratios of have been set at 1.9 or SiO 2 /Al 2 O 3 , Na 2 O/SiO 2 , H 2 O/Na 2 O 2.5, 0.6 or 1.0 and 50 or 90, respectively. Reaction times have been 5 or 15 h and reaction temperature 80 or 100Γ„C. The inΓ½uence of these parameters on the textural and structural properties of the zeolite has been studied. All samples have been characterized by X-ray diΓΎ raction, infrared spectroscopy, scanning electron microscopy, diΓΎ erential thermal analysis and cation exchange capacity. The best conditions for synthesis are : and 15 h reaction time SiO 2 /Al 2 O 3 = 2.5, Na 2 O/SiO 2 = 1.0, H 2 O/Na 2 O = 50 at 100Γ„C.

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