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Manganese Oxide and its Properties
The chemical formula of
Its molecular weight (157.88) is Mn2O3. The black cubic crystal has a relative densities of 4.50. Manganese oxide does not dissolve in water, acetic or ammonium chloride solutions, but is soluble with other inorganic acids.
Manganese oxide is soluble in cold hydrochloric to form a brown liquid, changes into a red liquid in hot concentrated or dilute sulfuric, breaks down into MnO2 in hot nitric, then Mn3O4 when heated and releases oxygen. The two main forms are a-Mn2O3 (and g-Mn2O3).
The Methods for Preparation Manganese oxide
Preparation of aMn2O3
The easiest method is to heat manganese nitrate hexahydrate or pure b-MnO2 in air at 650degC until it reaches a constant weight. The easiest way to achieve constant weight is to heat manganese oxide or b-MnO2 at 650degC in air. If manganese is to be used as raw material for a product, the hexahydrate must first be heated to 190degC, and then crushed, before being heated to 650degC.
To 350 mL solution containing 2.2g of manganese-sulfate-tetrahydrate under vigorous stirring was added 34 mL solution of 3% peroxide followed by 50mL ammonia 0.2mol*dm-3 to produce gMnO (OH). Heat is used to quickly boil the dark brown, or black, suspension emitting oxygen. After boiling for four minutes, filter the solid, separate it, and wash with 1.5L warm water. Then, put it into a vacuum desiccator and add phosphorus pentoxide below 100. This gMnO (OH) was carefully dried at 250degC for 3days under reduced pressurized to obtain gMn2O3. Additionally, g -MnO2 is heated at 500degC and reduced pressure for 78 hours to prepare g -Mn2O3.
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