Abstract
A new semi-continuous process has been developed for the synthesis of Cr 2O 3 powders starting with Cr(III) acetylacetonate or acetate hydroxide dissolved in methanol. The precursor is first decomposed in the solvent under supercritical state (T = 325 to 450 °C, P = 10 MPa) and the formed solid is dried under either nitrogen or air flow. For various reaction temperatures and drying conditions, nanometric particles of pure amorphous or crystalline Cr 2O 3 powders are obtained with surface area between 350 and 30 m 2.g −1 according to their crystallization state.
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