文献类型：期刊文献

英文题名：Preparation and characterization of titania-alumina mixed oxides with hierarchically macro-/mesoporous structures

作者：Zhou, Zhiming[1]; Zeng, Tianying[1]; Cheng, Zhenmin[1]; Yuan, Weikang[1]

机构：[1] State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

年份：2011

卷号：50

期号：2

起止页码：883

外文期刊名：Industrial and Engineering Chemistry Research

收录：EI(收录号：20110313594433)

语种：英文

外文关键词：Alumina - High resolution transmission electron microscopy - Oxide minerals - Aluminum oxide - Thermoanalysis - X ray diffraction - Scanning electron microscopy - Thermodynamic stability - Titanium - Calcination

摘要：A series of hierarchically macro-/mesoporous structured TiO 2-Al2O3 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-Al2O3 materials were detailedly characterized by N2 adsorption-desorption, 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 °C calcined samples were thermally stable and retained the hierarchically macro-/mesoporous structure. Compared with pure TiO2 and pure Al 2O3, the presence of Al2O3 in the TiO2-Al2O3 mixed oxides retarded the anatase-to-rutile phase transformation, while the incorporation of TiO 2 promoted the formation of the α-Al2O3 phase in the mixed oxides. The hierarchically structured porous TiO 2-Al2O3 materials had high potential applications as catalyst supports. ? 2010 American Chemical Society.