HYDROTHERMAL TRANSFORMATION OF POROUS GLASS BEADS INTO POROUS GLASS BEADS CONTAINING ZEOLITE BETA (BEA)

摘要

Hydrothermal transformation of porous glass beads into porous glass beads containing zeolite Beta (BEA) is achieved, at 160℃, using tetraethylammonium hydroxide (TEAOH) as the templating agent. The products were characterised by various techniques. The XRD results indicate that the transformation of porous glass beads into phase-pure zeolite Beta occurs within the SiO_2/Al_2O_3 ratios of 50-100. The Light microscopic images indicate that the shape of the starting porous glass beads is preserved during the hydrothermal treatment. SEM reveals that the outer surface of the porous glass beads is completely covered by zeolite Beta crystals. N_2 adsorption isotherm reveals the microporous nature of the zeolite Beta sample obtained from porous glass beads.