ZSM-5分子筛的类固相体系合成及其晶化机理初探

SYNTHESIS OF ZSM-5 ZEOLITE IN THE SOLID-LIKE SYSTEM AND ITS CRYSTALLIZATION MECHANISM

采用具有液相和固相双相转化机理为主导的类固相体系分子筛合成方法，合成了ZSM-5分子筛。采用X射线衍射（XRD）、扫描电镜（SEM）和低温氮气吸附-脱附技术对合成样品进行了表征，结果表明，该体系合成的ZSM-5分子筛相对结晶度高，无杂晶，晶粒规整，具有高的比表面积和孔容，并呈现多级分布的孔道结构。与常规方法合成样品相比，具有合成周期短、投入产出比高、单釜产率可提高300％的优点。结合实验过程对类固相体系合成ZSM-5沸石的晶化机理进行了初步探索。

Based on both of liquid-phase and solid-phase transformation mechanism, ZSM-5 zeolite was synthesized in a solid-like system. The texture properties of the ZSM-5 samples were characterized by XRD, SEM and N2 adsorption-desorption techniques. The results showed that such ZSM-5 has high relative degree of crystallinity, an excellent multi-modal porous structure, large BET surface area and pore volume. Compared to conventional hydrothermal system, this synthesis process gives short-cycle, higher yield of products for each run in the vessel. The zeolite yield can increase more than 300 %. The preliminary study has been carried out for understanding the crystallization mechanism.