【摘要】 分别用微波晶化、常温晶化、水热晶化3种方法合成MCM-41中孔分子筛,详细比较了这3种合成方法在操作参数和所合成分子筛物性方面的差异.实验结果表明,微波法合成的MCM-41中孔分子筛品质优于常温晶化法合成的分子筛,与传统的水热晶化法相当,甚至在某些方面优于水热晶化法.微波晶化法具有下列明显的优势:节能、操作便利、环境污染少,且在实验过程中无转晶现象;合成时间短,较传统水热晶化法省时3~4倍;样品比表面积可达1000m2/g以上,晶粒直径小至30nm,且呈高度均匀分散分布,结构致密,孔径最可几分布极窄,孔容积可达1.178mL/g,具有良好的高温稳定性(大于900℃)及水热稳定性(分子筛孔壁厚可达2.55 nm).因此微波晶化法完全有望取代传统的水热晶化法,成为制备MCM-41中孔分子筛的实用化技术.更多还原

【Abstract】 Meso-pore zeolite MCM-41 was synthesized by means of microwave crystallization,room-temperature crystallization and hydrothermal crystallization.Then,the operation parameters of these three methods and the physical properties of the resulted MCM-41 were compared in detail.Experimental results suggest that(1) MCM-41 prepared via microwave crystallization possesses better properties than that prepared via room-temperature crystallization,even better than that prepared via the traditional hydrothermal crystallization;(2) microwave crystallization is energy-saving and eco-friendly,and is easy to operate without crystalline conversion in the crystallization process;(3) the synthesis period of microwave crystallization is 2~3 times less than that of the traditional hydrothermal crystallization;(4) the resulted MCM-41 prepared via microwave crystallization possesses high dispersion degree,narrow pore size distribution,good thermal stability(more than 900 ℃) and excellent hydrothermal stability,and is of a specific surface area of more than 1 000 m2/g,a crystal diameter of 30 nm,a pore volume of 1.178 mL/g and a pore wall thickness of 2.55 nm.It is thus concluded that the microwave crystallization,instead of the traditional hydrothermal one,will become a practical technology for synthesizing MCM-41.更多还原