中孔分子筛MCM-41的合成与表征

以白炭黑和正硅酸乙酯为硅源,十二、十六烷基三甲基铵为模板剂,用水热法和室温直接法合成出中孔分子筛MCM-41,考察了对合成的影响因素,用红外光谱、吸附、孔分布、热分析等手段对这两种产物进行了表征。结果表明:这种分子筛可以在很宽的配比范围内获得,但较高水硅比更有利于合成;在水硅比较低的体系中得到了一种类MCM-41中孔相(亦应属于MCM-41),其XRD衍射峰较宽,2θ角度偏低,具有类似于无定形硅铝酸盐的骨架结构。

The Synthesis and Characterization of Mesoporous Molecular Sieves MCM-41

Mesoporous molecular sieve MCM-41 and a mesoporous MCM-41-like solid were synthesized with organic surfactant CnH2n+1(CH3) 3NX(n= 12 ,16) as the templates by hydrothermal synthesis or direct synthesis at room temperature.The synthesis conditions and crystallization were investigated. Some hydrothermally synthesized products are proved to be amorphous by XRD determination,while after calcination they turned to mesoporous materials with high crystallinity.The structure and property of the two phases were studied by means of XRD,IR, TG and adsorption techniquesThe results show that the two materials have the same physical and chemical qualities, The inorganic portion of them resembles amorphous silicates or aluminosilicates rather than crystalline molecular sieves.