沸石
ZSM-5型
结晶
材料科学
成核
化学工程
水热合成
热液循环
吸附
Crystal(编程语言)
晶体生长
胶体二氧化硅
铝
解吸
矿物学
结晶学
催化作用
化学
纳米技术
有机化学
复合材料
程序设计语言
工程类
计算机科学
涂层
作者
Ling Zhang,Shenglin Liu,Sujuan Xie,Longya Xu
标识
DOI:10.1016/j.micromeso.2011.05.033
摘要
A series of ZSM-5/ZSM-11 co-crystalline zeolites with various compositions and morphologies were successfully synthesized via an organic template-free hydrothermal route and characterized by XRD, XRF, SEM, NMR and N2 adsorption/desorption technologies. The effects of raw materials and batch composition were investigated systematically. Various silicon sources can be employed in the organic template-free synthesis of ZSM-5/ZSM-11 co-crystalline zeolite, however only a few types of aluminum sources are available. This organic template-free system is favorable to the aluminum-rich zeolite. With the increase of initial SiO2/Al2O3 ratio, the ZSM-5 percentage in the ZSM-5/ZSM-11 co-crystalline zeolite increases as well as the crystal size, and especially the morphology of ZSM-5/ZSM-11 co-crystalline zeolite prepared from the colloidal silica–NaAlO2 solution system changes gradually from nano-rod aggregation, micro-spindle to single hexagon and then to twinned hexagon crystals. Moreover, Na+ and OH− in the initial materials can promote the nucleation of the ZSM-5/ZSM-11 co-crystalline zeolite significantly and are beneficial to the formation of crystals with relatively low length/width ratio, while K+ postpones the crystallization process seriously.
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