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通过易于控制的手段,合成出了超高表面积的MCM-41分子筛,并采用XRD、N2吸附脱附、热重-差热分析、SEM等测试手段对合成样品进行分析表征,主要考察了晶化时间对分子筛表面积的影响.其XRD结果表明,合成的固体产物具有六方排列的孔道结构,结晶度高.氮吸附脱附实验表明,产物具有单一的孔径分布,其BET表面积可达1300m2·g-1左右,合成样品的平均孔径约3.2nm,适宜的晶化时间是50～100h.热重分析表明,样品热稳定性好,吡啶升温脱附曲线表明合成的样品具有弱酸性.
The ultrahigh surface area MCM-41 molecular sieve was synthesized by easy control. The synthesized samples were characterized by XRD, N2 adsorption-desorption, TG-DTA and SEM. The effects of crystallization Time on the molecular sieve surface area.The XRD results show that the synthesized solid product has hexagonal arrangement of pore structure, high crystallinity.Nitrogen adsorption and desorption experiments showed that the product has a single pore size distribution, the BET surface area of up to 1300m2 · g- 1, the average pore size of the synthesized sample is about 3.2nm, and the suitable crystallization time is 50 ~ 100h. TG results show that the sample has good thermal stability and the temperature-programmed desorption curve of pyridine shows the weak acidity of the synthesized sample.