Preparation of Monodispersed, Spherical Particles of Hydrated Alumina. (1). Control of Particle Size and Variation of Specific Surface Area on Heating.
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Monodispersed, spherical particles of hydrated alumina were prepared by hydrolyzing of aluminum sulfate solution ([Al2(SO4)3·18H2O]=0.5∼2.0×10-3mol/dm3) at 90°C in the presence of urea ([CO(NH2)2]=0.15mol/dm3). The particle size changed from about 0.2 to 1.0μm depending on the initial concentration of aluminum sulfate in the solution. These particles were amorphous, and transformed to η-Al2O3 at 900°C and then to α-Al2O3 at 1100°C. The particles of η-Al2O3 heated up to 900°C were also monodispersed spheres and had a relatively large specific surface area of about 90m2/g.
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