球形硅基介孔分子筛的合成和表征

介绍球形MCM-41和球形SBA-15介孔分子筛的合成，通过XRD、N₂吸附-脱附、SEM和TEM 对合成的分子筛进行了表征.结果表明：合成的介孔分子筛具有与经典方法合成的样品相似的特征参数，合成的球形MCM-41和球形SBA-15的比表面积分别为1 107 m²·g^-1和583 m²·g^-1，比孔容分别为0.69 cm³·g^-1和1.27 cm³·g^-1，平均孔径分别为2.5 nm和7.4 nm；合成的MCM-41和SBA-15均具有很好的球形外貌；湿磨基本上不影响MCM-41的球形外貌，而SBA-15的球形外貌却很容易被破坏；合成的球形SBA-15颗粒尺寸大，需经过湿磨才能观测到其内部孔道结构.

Synthesis and Characterization of Mesoporous Silica with Spherical Morphology

The mesoporous molecular sieves MCM-41 and SBA-15 with spherical morphology were synthesized.The samples were characterized by XRD,N2 adsorption-desorption analysis,SEM and TEM.The results show that the samples prepared in the research have the same typical parameters as those of the conventional hydrothermal method.The prepared MCM-41 and SBA-15 have the specific surface areas of 1 107 m~2·g~(-1) and 583 m~2·g~(-1),respectively,the specific pore volumes of 0.69 cm~3·g~(-1) and 1.27 cm~3·g~(-1) respectively,and the average pore diameters of 2.5 am and 7.4 nm respectively.Both MCM-41 and SBA-15 prepared have good spherical morphology.The wet grinding process had little effect on the morphology of MCM-41,but great effect on the spherical morphology of SBA-15.The ordered internal pore channel structure could be observed only after wet grinding because of the larger particle size of SBA-15.