磷酸介质体系中合成Al-SBA-15介孔分子筛的研究(英文)

Research on Synthesis of Al-SBA-15 Mesoporous Molecular Sieves in Phosphoric Acid Medium

以正硅酸乙酯为硅源,非离子表面活性剂P123为模板剂,异丙醇铝为铝源,在磷酸介质中合成出了Al-SBA-15介孔分子筛。采用XRD、TEM、SEM、N2-BET、TG-DTA等表征手段,考察了所得材料的物化性能。分析了初始溶液中硅铝比对介观结构的影响。所得材料在XRD谱图中(100)、(110)和(200)处出现较强衍射峰,氮气吸-脱附曲线为典型的Ⅳ型且有H1滞后环,结合TEM分析表明产物具有二维六方排列的介孔结构(空间群为p6mm),SEM结果表明相对纯硅SBA-15,Al-SBA-15介孔分子筛长程有序性没有受到限制。

Using tetraethyl orthosilicate as silica source, non-ionic surfactant P123 as template and aluminum isopropoxide as aluminum source, Al-SBA-15 mesoporous molecular sieves were obtained in the presence of phosphoric acid. By means of XRD, TEM, SEM, N2-BET, TG-DTA techniques, the properties of the samples were characterized. The effect of the molar ratio of Si/A1 in the starting reactant solution on the mesoporous structure was investigated. The materials exhibited strong reflection peaks at （100）, （110） and （200） reflection lines. N2 adsorption-desorption isotherms were typical IV type with a H1 hysteresis loop. XRD and TEM results showed that the samples possessed 2D hexagonal symmetry （p6mm） mesostructure. SEM images revealed that Al-SBA-15 hold the long range ordering mesoporous structure compared with pure silica SBA-15.