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Influence of OH -/SiO 2 ratio (alkalinity) on the particle size distribution and structure of the β zeolite synthesized during a shorter crystallization period (60 h) has been studied. The results indicate that the characteristic point of crystallinity of synthetic zeolite is at alkalinity of 0 23～0 24. When the alkalinity is higher than 0 39, β zeolite can not be obtained. The difference of crystal size between the zeolites synthesized from gels with different alkalinity is 0 7～0 8 μm. Along with the increase of the alkalinity, the particle size distribution varies from narrow to wide and again from wide to narrow, and the framework Si/Al ratio by 29 Si NMR increases gradually and then decreases, but the change of OhAl/TdAl ratio by 27 Al NMR is contrary to that of framework Si/Al ratio. In addition, the Si(OH) site existing in the TEA β is confirmed by NMR.
Influence of OH - / SiO 2 ratio (alkalinity) on the particle size distribution and structure of the β zeolite synthesized during a shorter crystallization period (60 h) has been studied. The results indicate that the characteristic point of crystallinity of synthetic zeolite is at The difference of crystal size between the zeolites synthesized from gels with different alkalinity is 0 7 ~ 0 8 μm. With the increase of the alkalinity of 0 23 ~ 0 24. When the alkalinity is higher than 0 39, β zeolite can not be obtained. of the alkalinity, the particle size distribution varies from narrow to wide and again from wide to narrow, and the framework Si / Al ratio by 29 Si NMR increases gradually and then decreases, but the change of OhAl / TdAl ratio by 27 Al NMR is In addition, the Si (OH) site existing in the TEA β is confirmed by NMR.