The Property And Preparation of Manganese Oxide Mn2O3 Powder

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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 dissolved in cold hydrochloric to form a brown-colored solution. In hot concentrated or dilute sulfuric, it becomes a reddish-brown solution. In hot nitric, MnO2 decomposes and manganese nitrogenate, then by heating, Mn3O4 decomposes and releases oxygen. The two main forms are a-Mn2O3 (black) and gMn2O3 (red).

The Methods for Preparation Manganese oxide

Preparation a-Mn2O3
It can also be made using divalent manganese sulfate heated in the air to 600-800degC. The easiest way to achieve constant weight is to heat manganese oxide or manganese-nitrate hexahydrate in air at 650degC. If manganese is to be used as raw material for a product, the hexahydrate must first be heated to 190degC, and then crushed, before heating it to 650degC.

Preparation of gMn2O3
To 350 mL solution containing 2.2g of manganese-sulfate-tetrahydrate under vigorous stirring was added 34 mL solution of 3% peroxide, followed 50 mL ammonia 0.2mol*dm-3 to generate 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 dehydrated under reduced pressure at 250degC for 3days to obtain g-Mn2O3. Additionally, gMnO2 under reduced pressure can be heated for 78 hours at 500degC.

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