高稳定性介孔分子筛的合成与表征(英文)

SYNTHESIS AND CHARACTERIZATION OF HIGHLY STABILIZED MESOPOROUS MOLECULAR SIEVES

以天然黏土和硅酸钠为原料、十六烷基三甲基溴化铵为模板剂,水热法合成了有序性好的高稳定性介孔分子筛。用粉末X射线衍射、透射电镜、Fourier变换红外光谱和比表面积孔径分析等方法对所合成的介孔分子筛进行了表征。结果表明所合成的介孔分子筛的比表面积大于550m2/g,平均孔径为2.72nm。样品经850℃焙烧3h,100℃水热处理10d,介孔分子筛的介孔结构没有被破坏,并且热处理使孔发生收缩,比表面积减小,水热处理使介孔的有序性变得更好,天然黏土为原料提高了介孔分子筛的水热稳定性。

Highly stabilized mesoporous molecular sieves were synthesized by the hydrothermal method using natural clay and sodium silicate as raw materials and cetyltrimethyl ammonium bromide as a template. The samples were characterized by means of X-ray diffraction, transmission electron microscopy, specific surface area analysis, Fourier transform infrared spectroscopy and N2 physical adsorption. The results show that the synthesized mesoporous molecular sieve has a specific surface area over 550 m^2/g and an average pore size of 2.72 nm. The pore structure is not damaged after calcination at 850℃ for 3 h or hydrothermal treatment at 100℃ for 10d. The mesoporous ordering is improved, but the pores contract and the specific surface area decreases after hydrothermal treatment. The stability of the synthesized mesoporous molecular sieves is enhanced because natural clay was used as a raw material.