Abstract: The crystallization process of β zeolite has been investigated by using FT IR, XRD, TG, SEM, and ICP AES. The samples were obtained by hydrothermal synthesis at 140 ℃ and chemical composition of the mixture used for synthesis can be expressed as n(Al₂O₃)∶n(SiO₂)∶n(TEABr)∶n(Na₂O)∶ n(NaF) ∶n(H₂O)∶n =1∶25∶7.5∶2.5∶3.75∶550∶6.25. The crystallization curve of zeolite β exhibits a typical Sshaped characteristic. The typical framework IRabsorptions at 567 and 518 cm^-1 have different natures. The former is detected at the beginning of induction period and its intensity changes a little in induction period, but exhibits a direct correlation with crystallinity in growth period. The latter is not detected in the induction period, but exhibits the same trend in growth period. The large amorphous SiO₂ Al₂O₃ particles which are visible at the beginning of crystallization change into small grains during the induction period. n(SiO₂)/n(Al₂O₃) ratio of the solid phases obtained at different synthesis time changes significantly during the induction period, but changes a little in growth period. So the β zeolite crystal nucleus are formed via liquid phase synthesis mechanism. Atypical gel in synthesis of β zeolite is transformed initially into a solid, which contains richer aluminium, minor F^- and occluded TEAspecies. The aluminosilicate gel particles are dissolved by F^- during the induction period and the transition complex, which has a specific weak X-ray diffraction peak at 2θ=22.8° and specific DTGpattern, is formed at the turning point from induction period to growth period. During the growth period Si and Al transport from the liquid to the solid phase at almost the same rates. F^- anion has greater influence on the formation and turning of transition complex.

Key words: Zeolite, Crystallization process, Composite of template, Transition state, Fluorine anion