Al-MCM-41介孔材料的合成与表征

以正硅酸乙酯(TEOS)作硅源,十六烷基三甲基溴化铵(CTAB)作模板剂,采用水热合成法在碱性条件下制备了Al-MCM-41介孔材料。用XRD、低温N2吸附和紫外漫反射光谱表征了其结构,表明产物中Al已嵌入到介孔材料的骨架中。其中Al的配位状态由于掺杂量的不同而不同,量多时是以四配位进入MCM-41的骨架的,量少时是以六配位处于MCM-41的骨架外。

Synthesis and Characterization of Al-MCM-41 Mesoporous Material

Al - MCM -41 mesoporous material was prepared by the hydrothermal method using tetraethyl orthosilicate (TEOS) as the silica source and cetyltrimethyl ammonium bromide (CTAB) as the structure - directing agent. By means of powder X - ray diffraction, low - temperature nitrogen absorption technique and ultraviolet diffuse reflectance spectroscopy, the sample was characterized. The results show that the metal ion is successfully incorporated in the framework of mesoporous material. The coordinated state of the aluminum varies with the variety of the amount. When the quality of the aluminum is big, the atoms are present with a 4 - coordinated in the framework of sample, otherwise a 6 - coordinated out of the framework of sample.