具有MFI结构的La-SiZSM-5分子筛的合成(英文)

Synthesis of Lanthanum-silicate Molecular Sieves with MFI Structure

首次合成了稀土元素掺杂的具有MFI结构的La-Si ZSM-5分子筛,并采用各种技术对所合成的分子筛进行了表征.XRD衍射表明所合成的微孔材料具有典型的MFI结构,N2吸脱附、FT-IR及SEM测试结果均表明镧原子进入了分子筛骨架.

A new Lanthanum-silicate molecular sieves with MFI structure is synthesized in Al-free form for the first time and characterized by various techniques. X-ray diffraction（XRD）showed that the synthesized microporous materials had a typical MFI structure. N2 adsorption/desorption measurements confirmed that the samples synthesized had surface areas （330 - 345 m^2 · g^-1 ） similar to ZSM-5 zeolite. FT-IR results revealed that incorporated Lanthanum species existed in tetrahedral coordination. Scanning electron microscope（SEM） micrographs revealed that the particles have well-defined morphologies, Which was in correspondence with XRD results.