中文摘要：

以相变理论为基础,通过估算溶液表面能、X射线衍射物相分析、扫描电子显微镜形貌观察和能谱分析,研究了合成ZSM-5/丝光沸石（mordenite,MOR）共生分子筛溶液的变化特点、晶体的生长过程。结果证明：ZSM-5分子筛和MOR物相间的相变过程中存在自由能驱动力、相界面、位相关系、惯习面和应变能等明显的固相转变特征。结合液-固、液-液和固-液3种相变机理,建立了ZSM-5/MOR共生分子筛的合成机理为：合成溶液先出现固-液分相,形成富硅相和富铝相,在富硅相中生成ZSM-5,在富铝相中生成MOR;由于ZSM-5分子筛的表面能比MOR大,体系处于亚稳相,在成核生长后期,ZSM-5分子筛通过固态相变过程,逐渐转变为MOR,达到相态平衡。通过实验验证了ZSM-5/MOR共生分子筛合成中3种相变过程的存在及ZSM-5/MOR共生分子筛的生长机理。

英文摘要：

On the basis of phase transition theory,the characteristics of synthetic ZSM-5/mordenite（MOR） sieves solution,the growth progress of molecular sieves crystals were investigated by estimating solution surface energy,X-ray diffraction,scanning electron microscope and energy spectroscopy analyses.The results show that obvious solid phase transition exists between ZSM-5 and MOR molecular sieves,which are characterized by formation free energy,phase interface,phase relationship,habit plane and strain energy.Together with liquid-solid,solid-solid,and solid-liquid phase transition mechanism,the synthetic mechanism of ZSM-5/MOR can be explained as：the phase separation of solution appears on the first stage;as a result,the solution is separated into silicon-rich phase to produce ZSM-5 and aluminum-rich phase to produce MOR.However,the phases are metastable because the surface energy of ZSM-5 sieves is larger than that of MOR.Thus,on the late stage of nucleation,ZSM-5 sieves transit to MOR gradually until intergrowth phase balance reaches.The above-mentioned explanation is also further proved by our experiments.