【摘要】 为了合成结晶度较高的纯低硅X分子筛，系统研究了合成体系的硅铝比[n（SiO₂）/n（Al₂O₃）]、碱硅比[n（Na₂O+K₂O）/n（SiO₂）]、水碱比[n（H₂O）/n（Na₂O+K₂O）]、钾碱比[n（K₂O）/n（Na₂O+K₂O）]及老化温度、晶化温度对产物性质的影响规律，采用X射线衍射、甲苯动态吸附、X射线荧光光谱、固体核磁共振、扫描电镜对产物进行表征。结果表明：随着合成体系硅铝比、碱硅比、水碱比、钾碱比、老化温度、晶化温度的升高，所得低硅X分子筛的结晶度和合成产物的甲苯吸附容量均呈先升高后降低趋势；合成体系优选的硅铝比为2.05、碱硅比为3.25、水碱比为17、钾碱比为0.23、老化温度为50～80℃、晶化温度为95℃,所得低硅X分子筛的形貌为0.5～1.5μm晶粒聚集的球体，硅铝比为2.0,不含非骨架铝。更多还原

【Abstract】 In order to synthesize pure low-silicon X zeolite with high crystallinity, the effects of n（SiO₂）/n（Al₂O₃）,n（Na₂O+K₂O）/n（SiO₂）,n（H₂O）/n（Na₂O+K₂O） and n（K₂O）/n（Na₂O+K₂O） as well as aging and crystallization temperature on the properties of the products were systematically investigated. The products were characterized by X-ray diffraction, dynamic adsorption of toluene, X-ray fluorescence spectrum, solid state nuclear magnetic resonance, and scanning electron microscopy. The results showed that with the increase of n（SiO₂）/n（Al₂O₃）,n（Na₂O+K₂O）/n（SiO₂）,n（H₂O）/n（Na₂O+K₂O）,n（K₂O）/n（Na₂O+K₂O）,aging temperature and crystallization temperature, the crystallinity and toluene adsorptive capacity of the synthesized low silicon X zeolite was increased firstly and then decreased. Under the optimum conditions covering a n（SiO₂）/n（Al₂O₃） of 2.05,a n（Na₂O+K₂O）/n（SiO₂） of 3.25,a n（H₂O）/n（Na₂O+K₂O） of 17,a n（K₂O）/n（Na₂O+K₂O） of 0.23,an aging temperature of 50-80 ℃,and a crystallization temperature of 95 ℃,the low-silicon X zeolite with high crystallinity degree can be obtained. The low-silicon X zeolite with a n（SiO₂）/n（Al₂O₃） of 2.0 without non-framework Al, shows sphere morphorology wich a diameter of 0.5-1.5 μm.更多还原