Preparation and Characterization of Titania鈭扐lumina Mixed Oxides with Hierarchically Macro-/Mesoporous Structures

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• 作者：Zhiming Zhou ; Tianying Zeng ; Zhenmin Cheng ; Weikang Yuan
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2011
• 出版时间：January 19, 2011
• 年：2011
• 卷：50
• 期：2
• 页码：883-890
• 全文大小：513K
• 年卷期：v.50,no.2(January 19, 2011)
• ISSN：1520-5045

文摘

A series of hierarchically macro-/mesoporous structured TiO₂鈭扐l₂O₃ mixed oxides with various molar ratios of Ti to Al was synthesized under different preparation conditions. The physical properties, that is, textural, morphological, and crystalline phase features of the prepared and calcined TiO₂鈭扐l₂O₃ materials were detailedly characterized by N₂ adsorption鈭抎esorption, scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and thermal analysis techniques. The results showed that the preparation conditions, such as the solution pH, the water concentration, the molar ratio of Ti to Al, and the surfactant, can greatly influence the sizes of macropores and mesopores, the specific surface area, the pore volume, and the crystallization process of the mixed oxides. Calcination treatments of the prepared materials revealed their high thermal stability. The 800 掳C calcined samples were thermally stable and retained the hierarchically macro-/mesoporous structure. Compared with pure TiO₂ and pure Al₂O₃, the presence of Al₂O₃ in the TiO₂鈭扐l₂O₃ mixed oxides retarded the anatase-to-rutile phase transformation, while the incorporation of TiO₂ promoted the formation of the 伪-Al₂O₃ phase in the mixed oxides. The hierarchically structured porous TiO₂鈭扐l₂O₃ materials had high potential applications as catalyst supports.