Self-transformation kinetics of porous glass granules into B-Al-MFI- type zeolite in a vapor phase of ethylamine and water was studied in the temperature range of 408-453 K.The products obtained in the transformation process were investigated with XRD. The activation energies of nucleation and crystal-growth calculated from the curves are 102.0 kj/mol and 34.7 kj/mol, respectively. The transformation rate of porous glass into zeolite is considerably influenced by reaction temperature.Lower temperature favors nucleation and formation of smaller zeolite crystals.On the other hand, higher temperature favors crystal growth and formation of larger crystals. The transformation rates under different reaction temperatures reached the maximum (v-m) at almost the same time (ca. 132 h)

Key words: GLASS, ETHYLAMINE, STEAM, CRYSTAL GROWTH, ACTIVATION ENERGY