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Kinetics of zeolite A particles formation from aged hydrogels

After hydrothermal treatment, hydrogel is transformed into crystalline zeolite A via three steps: nucleation, gel dissolution and crystal growth. Most of the nuclei are formed within gel matrix, and released to the solution during the gel dissolution where they become growing crystals. Transformation ends when the concentration of reactive species drops to the value of ZA solubility. Hydrogels of the same chemical composition were aged for 10 and 158 hours. Products gained during and after hydrothemal treatment were characterized by XRD, optical and scanning electron microscopy while the concentrations of Si- and Al- reactive species in the liqud phase were monitored by atomic absoprtion spectrometry.

zeolite A; hydrothermal transformation

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