【摘要】 以P123嵌段共聚物表面活性剂为模板剂,在不同晶化温度下合成了不同孔径和比表面积的六方相介孔氧化硅SBA-15,通过XRD,SEM,N2吸附-脱附及TEM等手段系统考察了不同晶化温度对SBA-15晶胞参数、比表面积、孔径及形貌的影响,得到反应最佳晶化温度为120℃.随着晶化温度的升高,SBA-15的孔径增大,比表面积下降,团聚体颗粒打开形成散落短棒状.同时还对温度影响SBA-15结构和形貌的机理进行了探讨.更多还原

【Abstract】 Highly ordered hexagonal mesoporous SBA-15 with different pore sizes and BET surface areas was prepared under different crystallization temperatures,using nonionic triblock P123 as template. By means of XRD,SEM,N2 adsorption-desorption and TEM,the effects of crystallization temperature on morphology,surface area and pore size of SBA-15 were investigated. The results indicate that the best crystallization temperature is about 120℃. With increasing of crystallization temperature,the pore size of SBA-15 is increased and BET surface area decreased. When the crystallization temperature is 140℃ or higher,SEM images reveal that the morphology of SBA-15 is changed from “wheat-like” agglomerate particles to “banana-like” short rods. These results are discussed further in terms of the synthesis mechanism of SBA-15 and structure characteristics of P123 surfactant.更多还原