A facile rout to synthesis lamellate structure mesoporous alumina using polyethylene glycol 6000 (PEG, molecular weight = 6000) as structure directing agent
A facile rout to synthesis lamellate structure mesoporous alumina using polyethylene glycol 6000 (PEG, molecular weight = 6000) as structure directing agent
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DOI：
10.1016/j.micromeso.2012.04.002
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发表时间：
2012-09
影响因子：
5.2
通讯作者：
A. Su;Yong Zhou;Yunqiang Yao;Y. Chengmin;Hui Du
中科院分区：
文献类型：
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作者：
A. Su;Yong Zhou;Yunqiang Yao;Y. Chengmin;Hui Du
以Al 2（SO 4）3和NaAlO 2为铝源，在非离子表面活性剂PEG 6000存在下，制备了具有结晶骨架壁的层状结构介孔氧化铝。SEM、TEM、TG-DSC和FTIR表征表明，PEG表面活性剂诱导形成了含水量相对较低的片状结构勃姆石。XRD和SAED结果表明，样品在600°C煅烧3 h后，形成了结晶良好的介孔γ-Al 2 O3。N2物理吸附结果表明，该方法制备的介孔氧化铝具有非常丰富的孔隙率和较大的介孔，且在沉淀过程中加入表面活性剂后，孔容和孔径均增大。所得γ-Al_2O_3具有片状形貌，比表面积高达279 m2/g，粉体无明显团聚。样品中织构参数的改善应归因于片状结构纳米颗粒的形成。
In this study, Al2(SO4)3and NaAlO2were used as aluminum precursors for preparing lamellate structure mesoporous alumina with crystalline framework walls in the presence of non-ionic surfactant PEG6000. The characterization by SEM, TEM, TG-DSC and FTIR revealed that PEG surfactant induced the formation of the lamellate structure boehmite with relatively lower water content. XRD and SAED results conveyed the formation of well-crystallined mesoporous γ-alumina after the samples were calcined at 600°C for 3h. N2physisorption showed that the mesoporous alumina prepared in this way displayed very rich porosities with large mesopores, and both the pore volumes and the pore sizes increased with the addition of such surfactant in the precipitation process. The obtained γ-alumina with lamellate morphology exhibited a large surface area of 279m2/g, and the powder has no obvious agglomeration. The improved textural parameters in the samples should be attributed to the formation of lamellate structure nanoparticles.