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Mechanism and kinetics of the growth of zeolite microcrystals. Part 2. Influence of sodium ions concentration in the liquid phase on the kinetics of zeolite A crystallization

Changes of the concentrations, CAl, of aluminum and, CSi of silicon in the liquid phase as well as of the dimension, Lm, of the largest crystals were measured during crystallization of zeolite A from the amorphous aluminosilicate precursors dispersed in alkaline solutions containing different amounts of Na+ ions. Analysis of the measured data have shown that the growth rate of zeolite A crystals is size-independent, and that Na+ ions, together with aluminate and silicate anions from the liquid phase take a part in the surface reaction of the crystal growth of zeolite A. Kinetic equations which describe the change of Lm as a function of the change in concentrations of Na, Al and Si in the liquid phase are derived and evaluated by correlation with the measured changes of Lm.

Zeolite A; Crystal growth; Mechanism; Kinetics; Influence of sodium ions

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