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以微米铝球为铝源,正硅酸乙酯(TEOS)为硅源,聚醚三嵌段聚合物P123为模板剂,在酸性水溶液中,一步直接合成含有笼状大孔的介孔氧化硅(铝)分子筛Al-SBA-15.用透射电子显微镜(TEM)、扫描电子显微镜(SEM)、27Al固体核磁(27AlMAS-NMR)、ICP发射光谱仪、X射线衍射(XRD),以及低温N2吸/脱附对样品进行了表征.结果表明,得到的材料是二维六方结构(空间群p6mm)的Al-SBA-15,经过550℃焙烧后,Al-SBA-15的比表面积大约为500m2/g,Si/Al比在40~80之间,四配位铝/六配位铝之比约为2,结构中存在约70~80nm的笼型大孔和约为5nm的介孔.
A kind of mesoporous silica containing cage macropores was synthesized in one step by using micron aluminum ball as aluminum source, tetraethoxysilane (TEOS) as silicon source and polyether triblock polymer P123 as templating agent in acidic aqueous solution (Aluminum) molecular sieve Al-SBA-15. The microstructure and mechanical properties were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), 27Al solid state nuclear magnetic resonance spectroscopy, ICP emission spectroscopy, XRD, The results show that the obtained material is Al-SBA-15 with two-dimensional hexagonal structure (space group p6mm), and the specific surface area of Al-SBA-15 after calcination at 550 ℃ is about 500m2 / g , The Si / Al ratio is between 40 and 80, the ratio of tetracoordinate aluminum / hexacoordinated aluminum is about 2, and the cage has macropores of about 70-80 nm and mesopores of about 5 nm in the structure.