含氟体系中合成条件对MCM-48分子筛结构性能的影响

在合成过程中引入F~-可以缩短MCM-48分子筛的晶化时间,考察以正硅酸乙酯(TEOS)为硅源、十二烷基三甲基溴化铵(CTAB)为模板剂的合成体系中加入F~-后,n(CTAB)∶n(Si)、晶化时间和晶化温度等合成条件对MCM-48结构性能的影响。XRD、N_2吸附脱附和TEM等表征结果表明,在n(CTAB)∶n(Si)=0.65、晶化温度120℃和反应时间24 h条件下,合成的MCM-48分子筛结晶度较高,比表面积为1 305 m~2·g~(-1),平均孔径3.416 nm,为MCM-48分子筛的适宜合成条件。

Influence of synthesis condition on structural properties of mesoporous MCM-48 molecular sieves prepared in fluorine-containing system

The crystallization time of mesoporous MCM-48 molecular sieves could be shortened by adding fluoride ions into the synthesis system. The influence of n （CTAB） ： n （ Si）, crystallization time and crystallization temperature on structural properties of MCM-48 molecular sieves was investigated in the fluorine-containing synthesis system using TEOS and CTAB as silica source and template, respectively. The as-prepared MCM-48 molecular selves were characterized by XRD, N2 adsorption-desorption and TEM. The characterization results showed that MCM-48 molecular sieves exhibited higher crystallinity and its BET surface area of 1 305 m^2 · g^-1 and average pore size of 3. 416 nm were attained under the optimum synthesis condition as follows ： n （CTAB） ： n （Si） = 0.65, crystallization temperature 120 ℃ and crystallization time 24 h.