Synthesis using alumina precursors subjected to acid attack

Alumina is a material used in a wide range of applications, including refractories, structural materials, catalysts, sensors, etc.. Several synthetic methods are available for the production of sub-micrometer alpha alumina and nano, however, it is necessary to use special equipment or long synthesis times. Thus, this study aims the synthesis of alumina powders using a technique of treating their acid precursors. The precursors were obtained from the decomposition of aluminum acetate and the 650th 850 deg C, obtaining a precursor amorphous and gamma alumina. These materials were subjected to etching and ashing. Based on the results can be noted that the etching reduced the temperature of formation of alpha phase, yielding alpha alumina in the calcination temperature of 900 deg C. The etching was more effective in reducing the formation temperature alpha phase when using the amorphous precursor (author)