Plate-like precursors formed in crystallization process of ferrierite from (Na, K)-aluminosilicate system
Plate-like precursors formed in crystallization process of ferrierite from (Na, K)-aluminosilicate system
复制标题
DOI：
10.1016/j.micromeso.2012.03.038
复制
发表时间：
2012-08
影响因子：
5.2
通讯作者：
M. Isobe;Takahiko Moteki;Shinya Tanahashi;Riichiro Kimura;Y. Kamimura;K. Itabashi;T. Okubo
中科院分区：
文献类型：
--
作者：
M. Isobe;Takahiko Moteki;Shinya Tanahashi;Riichiro Kimura;Y. Kamimura;K. Itabashi;T. Okubo
研究了镁碱沸石和丝光沸石分别在（Na，K）-和Na-铝硅酸盐体系中的结晶行为。通过对反应物凝胶进行不同加热时间后的水热处理获得铝硅酸盐产物，并通过X射线衍射、场发射扫描电子显微镜、拉曼光谱、电感耦合等离子体原子发射光谱和固态29 Si MAS NMR光谱表征其性质。结果表明，镁碱沸石晶化是在较长的诱导期后突然完成的。观察到富含五元环（5 Rs）的板状前体的形成，随后是结晶。另一方面，丝光沸石的结晶进行了很长一段时间，并没有观察到这种独特的前体。在镁碱沸石的情况下，有人建议，结晶将通过堆叠浓缩的5 R-丰富的板状前体进行。
Crystallization behaviors of zeolites ferrierite and mordenite in (Na, K)- and Na-aluminosilicate systems, respectively, are investigated. Aluminosilicate products are obtained by the hydrothermal treatment of reactant gel after various heating periods, and their properties are characterized by X-ray diffraction, field-emission scanning–electron microscopy, Raman spectroscopy, inductively coupled plasma-atomic emission spectroscopy, and solid-state29Si MAS NMR spectroscopy. The results show that crystallization of ferrierite completed suddenly after a long induction period. The formation of a plate-like precursor rich in five-membered rings (5Rs) was observed, which was followed by the crystallization. On the other hand, the crystallization of mordenite proceeds over a long period and such unique precursors were not observed. In the case of ferrierite, it was suggested that the crystallization would proceed through stacking condensation of 5R-rich plate-like precursors.