Size-controlled synthesis of monodispersed mesoporous α-Alumina spheres by a template-free forced hydrolysis method

Hee Suk Roh, Geun Kyu Choi, Jae Sul An, Chin Moo Cho, Dong Hoe Kim, Ik Jae Park, Tae Hoon Noh, Dong Wan Kim, Kug Sun Hong

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29 Citations (Scopus)

Abstract

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 Al3+ reactants (sulfates and nitrates). In addition, the systematic phase and morphological evolutions from aluminum hydrous oxide to γ-alumina (Al2O3) and finally to α-Al2O3 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°C and 1100 °C for 1 h, we observed complete conversion to phase-pure γ- and α-Al2O3, respectively, while maintaining monodispersity (125 nm, 195 nm, 320 nm, and 430 nm diameters were observed). Furthermore, both γ- and α-Al2O3 were found to be mesoporous in structure, providing enhanced specific surface areas of 102 and 76 m2 g-1, respectively, based on the Brunauer-Emmett-Teller (BET) measurement.

Original languageEnglish
Pages (from-to)6901-6905
Number of pages5
JournalDalton Transactions
Volume40
Issue number26
DOIs
Publication statusPublished - 2011 Jul 14

ASJC Scopus subject areas

  • Inorganic Chemistry

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    Roh, H. S., Kyu Choi, G., An, J. S., Moo Cho, C., Hoe Kim, D., Jae Park, I., Hoon Noh, T., Kim, D. W., & Sun Hong, K. (2011). Size-controlled synthesis of monodispersed mesoporous α-Alumina spheres by a template-free forced hydrolysis method. Dalton Transactions, 40(26), 6901-6905. https://doi.org/10.1039/c1dt10418g