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Synthesis and particulate properties of zeolite A

Zeolites are materials with different applications. Every field of usage has special demands regarding zeolite particulate properties. Understanding the mechanisms of crystal formation enables control of these properties. After ageing at 25°C for ta = 0-209 h hydrogels of composition 3, 2 Na2O × 2 SiO2 × 1, 05 Al2O3 × 250 H2O were heated in reactor at 80°C under dynamic conditions. Optical microscopy and SEM images as well as particle size measurement provided data on crystal size and specific surface area of final products. Specific number of zeolite A crystals was calculated from particle size distributions. Observed effects were discussed on the grounds of the autocatalytic nucleation theory.

zeolite A ; hydrothermal synthesis ; autocatalytic nucleation ; specific number of crystals ; hydrogel ageing

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