含氟体系中合成高品质的MCM-48介孔分子筛(英文)

Synthesis of mesoporous MCM-48 molecular sieves of high quality in a fluorine-containing system

在含氟体系中以正硅酸乙酯和十六烷基溴化铵作为硅源和模板剂,合成高质量的MCM-48。主要考察了各种影响合成MCM-48的因素,得到的产物分别用XRD,TEM和N2吸附-脱附技术进行表征。结果表明,合成高质量MCM-48的条件是温度为393 K,时间为24 h,CTAB/Si比为0.65;得到的MCM-48具有较大的比表面积(130 5 m2/g),孔径分布比较集中(2.416 nm)。

Mesoporous MCM-48 molecular sieves were synthesized in a fluorine-containing system using tetraethylorthosilicate（TEOS） as silica source and cetyltrimethylammonium bromide（CTAB） as template.To investigate the influence of various factors for synthesis on the structure and properties of the MCM-48 molecular sieves obtained,they were characterized by X-ray diffraction（XRD）,N2 adsorption-desorption and transmission electron microscopy（TEM）.The results showed that under the optimal conditions,i.e.a CTAB/Si ratio of 0.65 and crystallization at 393K for 24h,the as-synthesized MCM-48 exhibits high crystallinity with a specific surface area of 1305m2/g and an average pore size of 2.416nm.