A facile rout to synthesis lamellate structure mesoporous alumina using polyethylene glycol 6000 (PEG, molecular weight = 6000) as structure directing agent

摘要

In this study, Al2(SO4)3 and NaAlO2 were 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 FT1R 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 y-alumina after the samples were calcined at 600 °C for 3 h. N2 physisorption 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 y-alumina with lamellate morphology exhibited a large surface area of 279 m~2/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.