期刊
DALTON TRANSACTIONS
卷 40, 期 26, 页码 6901-6905出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1dt10418g
关键词
-
资金
- Ministry of Knowledge Economy
- Korea government (MEST) [2010-0002533]
We demonstrated the formation of monodispersed spherical aluminum hydrous oxide precursors with tunable sizes by controlling the variables of a forced hydrolysis method. The particle sizes of aluminum hydrous oxide precursors were strongly dependent on the molar ratio of the Al(3+) reactants (sulfates and nitrates). In addition, the systematic phase and morphological evolutions from aluminum hydrous oxide to gamma-alumina (Al(2)O(3)) and finally to alpha-Al(2)O(3) through thermal dehydrogenation were characterized by X-ray powder diffraction (XRD), field-emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). After annealing the amorphous aluminum hydrous oxide in air at 900 degrees C and 1100 degrees C for 1 h, we observed complete conversion to phase-pure gamma- and alpha-Al(2)O(3), respectively, while maintaining monodispersity (125 nm, 195 nm, 320 nm, and 430 nm diameters were observed). Furthermore, both gamma- and alpha-Al(2)O(3) were found to be mesoporous in structure, providing enhanced specific surface areas of 102 and 76 m(2) g(-1), respectively, based on the Brunauer-Emmett-Teller (BET) measurement.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据