不同制备条件对SBA-15介孔氧化硅的形貌、比表面积和孔径分布的影响

摘要

The effect of the ratio of block copolymer PI 23 over surfactant cetyltrimethylammonium bromide (CTAB), hydrolysis conditions, and aging treatment under microwave irradiation on the morphology, surface area and pore size distribution of SBA-15 have been investigated. It was found that with decreasing the ratio of P123 over CTAB , the morphology of the SBA-15 particles changed from short rods gradually to spheres. During the hydrolysis stage, vigorous stirring led to the formation of rod-like particles, while static hydrolysis resulted in the formation of spherical particles. In comparison with the aging method of hydrothermal treatment, microwave irradiation drastically promoted the formation of mesostructure of SBA-15 and had an impact on the particle shape, surface area and pore size distribution of the resultant SB A-15.%研究了表面活性剂用量、水解过程中维持搅拌或静置、水热或微波辐射陈化等反应条件或因素对合成SBA-15的形貌、比表面积以及孔径大小和分布的影响及规律.结果表明,在P123中增加CTAB表面活性剂的用量,所得SBA-15形貌由棒状逐渐转变为球型颗粒；硅源水解过程中,搅拌会使产物倾向于呈现棒状颗粒,而静置水解则有利于成球颗粒的形成.与水热陈化处理相比,微波能快速方便地合成形貌规则、比表面积大且孔径较均—的SBA-15.