The Property And Preparation of Manganese Oxide Mn2O3 Powder


Aug 23, 2023

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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 a brownish-red solution when it dissolves in cold hydrochloric or concentrated sulfuric acids. In hot nitric, MnO2 decomposes and becomes manganese Nitrate. Heating Mn3O4 releases oxygen. The two main forms are a-Mn2O3 (the brown solution) and gMn2O3 (the red solution).

The Methods for Preparation Manganese oxide

Preparation of aMn2O3
It can also be prepared by heating the divalent manganese in the air to 600-800degC. The simplest method is to heat manganese oxide or b-MnO2 at 650degC until it reaches a constant mass. 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 to 650degC.

Preparation g-Mn2O3
To 350 mL solution containing 2.2g manganese-sulfate-tetrahydrate under vigorous stirring 34 mL hydrogen peroxide was added dropwise. Then 50 mL ammonia (0.20 mol*dm-3), to form gMnO (OH) was then added. Heat is used to quickly boil the dark brown, or black, suspension emitting oxygen. After boiling for four minutes, filter the solid, wash with 1.5L hotwater, and then put it into a vacuum desiccator, below 100. After drying, you will obtain g-MnO (OH). This g -MnO (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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