engleski

Preinvestigation of the Synthesis of the ZA small Crystals from Clear Solutions

Synthesis of pure, very small crystals of zeolite NaA (ZA) without organic template is very interesting from commercial viewpoint of its use. In order to obtain pure ZA (especially without gel) starting mixture should be clear (criteria for clear solution was at least 24 h stability, without visible solid particles). In this work, we have investigated wide range of Na and Al content in starting mixture. Hydrothermal synthesis were made at two different temperatures 25 C and 80 C. Solid products were washed, dried and its phase composition was determined by X-ray diffraction. Diffractograms show that ZA was not obtained at any system at 25 C, and also that pure ZA can be synthesized at 80 C using following composition (oxyde form): 10 Na2O-0.3 Al2O3-SiO2-120 H2O.

Zeolite A; Small crystals; Synthesis; Clear solution

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