The XRD and IR results of silicalite-1 seeds

The crystal size of ZSM-5 zeolites synthesized through the hydrothermal
synthesis with commercial silica sol could be controlled by adding
colloidal silicalite-1 seeds. Different-sized silicalite-1 crystals were
synthesized uder different temperature and crystallization time by clear
liquid reflux method. After centrifuging, washing and drying, the
properties of the solid silicalite-1 crystals were characterized. The
results of  XRD and IR indicated that both the seeds possessed
MFI structure.  The crystallinity of the seed increased
with the increase of crystallization temperature. The particle size of
silicalite-1seeds depended on the synthesis temperature when other
synthetic conditions were the same.  The ZSM-5 zeolites
with controllable crystal size in the range of 200 nm-2200 nm could be
obtained by adding the silicalite-1 seeds with different amounts and
synthesis conditions. The growth of ZSM-5 crystal for the seed-induction
synthesis process followed a seed surface crystallization mechanism.