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Kinetics of the growth of zeolite A obtained by hydrothermalsynthesis from clear solution

Pure crystals of zeolite NaA were synthesized from clear alumosilicate solutions. Optimized starting composition of investigated solutions was: 10 Na2O 0.3 Al2O3 SiO2 120H2O. In the present work we have investigated influence of temperature on zeolite kinetics. Hydrothermal syntheses were performed at 40, 50, and 60°C under static conditions in convection oven. Reaction mixture was prepared adding sodium silicate solution into stirred sodium aluminate solution at 25&ordm ; C. The reaction mixture was filtrated to remove impurities and aged for 24 h. After that it was heated at appropriate temperature until and of the crystallization. The samples were taken at different crystallization time and solid phase was separated from mother liquid, washed and dried at 1050C. Characterization of the solid samples was preformed by X-ray diffraction and FT-IR (phase analysis), scanning electron microscopy (morphology), and dynamic light scattering (size distribution).

Zeolite A; Hydrothermal synthesis; Clear solution; Crystal growth; Kinetics

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