Abstract
A new method based on sol-gel technique of internal gelation has been described for the production of porous alumina microspheres of controlled size in the range 200 to 1000 μm. Good quality alumina gel spheres were prepared directly from aluminium nitrate solution, avoiding the sol preparation step, by adding urea and hexamethylene tetramine as the gelling agents. The process parameters were optimized to get the product of desired morphology. The quality of the spheres was examined by X-ray diffraction (XRD), thermogravlmetry-differential thermal analysis (TG-DTA), fourier transform infrared spectroscopy (FTIR), surface area and pore-size distribution.
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