以拟薄水铝石为铝源合成ZSM-22分子筛

以拟薄水铝石为铝源、硅溶胶为硅源，采用水热合成晶化法合成 ZSM-22 分子筛，考察硅铝比、晶种量、无机碱、晶化时间、晶化温度、水量等合成条件对ZSM-22 分子筛的影响。采用X射线衍射、扫描电子显微镜等手段对合成样品进行表征。结果表明：在晶化温度为 423～433 K、晶化时间为48 h、晶种添加量为1 500 μg/g、原料SiO2/Al2O3摩尔比为70～130、1,6-己二胺/SiO2摩尔比为0.3、H2O/SiO2摩尔比为35～50以及不添加无机碱的条件下，即可合成出结晶良好的ZSM-22分子筛；该条件下的ZSM-22分子筛聚集态为棒状晶体，分散状态为针状晶体，长度约为4 μm，直径约为 0.4 μm，具有典型的 TON 结构分子筛晶貌。

SYNTHESIS OF ZEOLITE ZSM-22 USING PSEUDO BOEHMITE AS ALUMINUM SOURCE

In the proposed boehmite as aluminum source, synthesis conditions investigated alumina ratio, the amount of seed, inorganic bases, crystallization time, crystallization temperature, water and other by hydrothermal crystallization method for the synthesis of zeolite ZSM-22 affected. Using XRD (X-ray diffraction), SEM (scanning electron microscope) and other characterization methods for the synthesis of the samples were characterized. Experimental results show that the crystallization temperature of 413-433 K, the crystallization time is 48 h, the seed addition amount of 1 500 μg/g, SiO2/Al2O3 mole ratio of 70-130, (1,6-hexanediamine) DAH/SiO2 is 0.3, H2O/SiO2 from 35-50, no inorganic base crystallinity can be synthesized ZSM-22 zeolite good.