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The ultra-fine chromic oxide powder was prepared by a novel gas-solid reduction reaction.Na2CrO4 was firstly reduced with hydrogen at 400-600 ℃.The obtained reduction products,mainly the mixture of NaCrO2 and sodium hydroxide(NaOH),were converted into chromic oxide through hydrolysis followed by calcination.The obtained chromic oxide product was characterized by powder X-ray diffraction(XRD) and SEM.The results show that the hydrolysis process of sodium chromite is the key step and lower reduction temperature helps intensify the hydrolysis process.
The ultra-fine chromic oxide powder was prepared by a novel gas-solid reduction reaction. Na2CrO4 was initially reduced with hydrogen at 400-600 ° C. The resulting reduction products, mainly the mixture of NaCrO2 and sodium hydroxide (NaOH), were converted into chromic oxide through hydrolysis followed by calcination. The obtained chromic oxide product was characterized by powder X-ray diffraction (XRD) and SEM. The results show that the hydrolysis process of sodium chromite is the key step and lower reduction temperature helps intensify the hydrolysis process .