The Property And Preparation of Manganese Oxide Mn2O3 Powder

Manganese Oxide and its Properties

The chemical formula of manganese oxide 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 a brownish-red solution when it dissolves in hydrochloric or nitric acids. In the presence of hot sulfuric or dilute sulfuric solutions, MnO2 decomposes and becomes manganese Nitrate. The two main forms are a-Mn2O3 (or g-Mn2O3) and a-Mn2O3 (or b-Mn2O3).

The Methods for Preparing Manganese oxide

Preparation a-Mn2O3
a-Mn2O3 may be further oxidized, reduced or prepared by heating manganese divalent salt in air at 600-800degC. 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 nitrate must first be heated to 190degC, and then crushed, before heating it at 650degC.

Preparation g-Mn2O3
To 350 mL solution containing 2.2g of manganese-sulfate-tetrahydrate under vigorous stirring was added 34 mL solution of 3% peroxide followed by 50 mL ammonia 0.2 mol*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, wash with 1.5L hotwater, then put it into a vacuum desiccator, with phosphorus Pentoxide below 100. This gMnO (OH) was carefully dried at 250degC for 3days under reduced pressurized to obtain g-Mn2O3. Additionally, gMnO2 under reduced pressure can be heated for 78 hours at 500degC.

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