Abstract
Nanosized chromium (Cr 2O 3) oxide was prepared by the common thermal decomposition of Cr(NO 3) 3·9H 2O chromium (III) nitrate nonahydrate. Prior to the heat treatment at 550 °C, the commercial reagent was first dissolved in a colloidal silica solution and then dried at a low temperature to slowly evaporate the aqueous solvent. The SiO 2/Cr(NO 3) 3·9H 2O weight ratio ( R) was changed from 0 to 2. The various Cr 2O 3 powders were characterized by XRD, FTIR, nitrogen adsorption, SEM and TEM techniques. A maximum specific surface area of 113 m 2 g −1, associated with a pore volume of 0.72 cm 3 g −1, was obtained for the Cr 2O 3 powder prepared with R = 2. These pristine chromium oxide nanoparticles, with a slightly sintered sphere-shaped morphology, exhibited a 10 nm particle size with a monocrystalline character as demonstrated by the TEM and XRD correlation.
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