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制备了一种摩尔组成为17Na2O:1Al2O3:17SiO2:300～380H2O的透明液相导向剂.并以天然高岭土为原料,硅溶胶为补加硅源与该导向剂组成反应混合物原位水热合成高硅NaY分子筛.分析了导向剂的结构与作用机理,详细考察了导向剂老化时间、老化温度及其加入量对导向剂的活性与合成产物性能的影响.发现只有在导向剂存在时才能合成出NaY沸石.当导向剂透光率高于80%,呈现透明的溶胶状态,才是导向剂的活性期.采用XRD、IR、SEM、N2静态容量吸附法对结晶产物的晶体结构、骨架振动信息、外观形貌、比表面以及孔分布进行了表征.结果显示,该导向剂具有较好的导向活性,在老化时间为20.5 h,加入量为10%时,原位合成出了结晶度较高、无杂晶的高硅NaY分子筛.所得分子筛的硅铝比大于5.0,比表面为771 m2/g、孔径集中在0.51 nm.
A transparent liquid phase directing agent with a molar composition of 17Na2O: 1Al2O3: 17SiO2: 300~380H2O was prepared, and the natural kaolin was used as raw material, and the silica sol was added as a silicon source and the directing agent was used to form the reaction mixture in situ. Silicon NaY molecular sieve.The structure and mechanism of the directing agent were analyzed.The effects of the aging time of the directing agent, the aging temperature and the amount of the directing agent on the activity of the directing agent and the properties of the synthesized product were investigated in detail.The results showed that the directing agent could only synthesize NaY zeolite.When the light transmittance of the directing agent is higher than 80%, the active phase of the directing agent is the active phase of the directing agent.The crystal structure, vibrational information of the crystal structure of the product are characterized by XRD, IR, SEM and N2 static capacity adsorption , Morphology, specific surface area and pore distribution were characterized.The results show that the directing agent has good guiding activity. When the aging time is 20.5 h and the adding amount is 10%, the high crystallinity , No hybrid high-molecular-weight NaY zeolite molecular sieve silicon-aluminum ratio of greater than 5.0, the specific surface of 771 m2 / g, the pore size concentrated at 0.51 nm.