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以正硅酸乙酯为硅源、十六烷基三甲基溴化铵为模板,在氟化物存在的条件下,通过水热法在不同晶化温度和时间下进行复合分子筛Y/MCM-48的合成。利用X射线粉末衍射、Fourier变换红外光谱、N2吸附–脱附、扫描电子显微镜和透射电子显微镜对合成的样品进行表征,同时考察了样品的稳定性及不同晶化时间和温度下样品的晶相。结果表明:在120℃水热晶化36h合成的Y/MCM-48具有良好有序的MCM-48介孔相以及NaY微孔相的双重孔结构,其比表面积高达864 m2/g,平均孔径为2.4 nm。样品经800℃焙烧4 h、100℃水热处理48 h后,复合分子筛的双重孔结构仍然存在。
Using tetraethyl orthosilicate as a silicon source and cetyltrimethylammonium bromide as a template, the composite molecular sieve Y / MCM-C was prepared by hydrothermal method at different crystallization temperature and time in the presence of fluoride. Synthesis of 48. The synthesized samples were characterized by X-ray powder diffraction, Fourier transform infrared spectroscopy, N2 adsorption-desorption, scanning electron microscopy and transmission electron microscopy. The stability of the samples and the crystal phases of the samples at different crystallization time and temperature . The results show that Y / MCM-48 synthesized by hydrothermal crystallization at 120 ℃ for 24 h has a well ordered MCM-48 mesoporous phase and a dual pore structure of NaY microporous phase with a specific surface area of up to 864 m2 / g and an average pore size Is 2.4 nm. After the samples were calcined at 800 ℃ for 4 h and hydrothermally treated at 100 ℃ for 48 h, the dual pore structure of the composite zeolite still existed.