What is MnO2 Powder?

Author : Trunnano

Update time : 2022-03-10 21:51:33

What is MnO2 Powder?
Manganese dioxide is an inorganic compound with the chemical formula MnO2. It is a black amorphous powder or black orthorhombic crystal. It is insoluble in water, weak acid, weak base, nitric acid, and cold sulfuric acid. For the preparation of manganese salts, also used as oxidant, rust remover, catalyst.
The characteristics of MnO2 Powder
1. Acidity and alkalinity: Manganese dioxide is an amphoteric oxide, which is a very stable black powdery solid at room temperature and can be used as a depolarizer for dry batteries. In the laboratory, its oxidizing property is often used, and it acts with concentrated HCl to produce chlorine gas.
2. Manganese dioxide is an amphoteric oxide, and there are corresponding salts in the form of perovskite structures such as BaMnO3 or SrMnO3 (obtained by a compound reaction in a molten alkali system) [1], and manganese tetrachloride also exists. .
3. When encountering reducing agent, it is oxidizing. For example, manganese dioxide is heated to 1400K in a hydrogen stream to obtain manganese oxide; manganese dioxide is heated in an ammonia stream to obtain brown-black manganese trioxide; manganese dioxide is reacted with concentrated hydrochloric acid to obtain chloride Manganese, chlorine and water.
4. In the case of strong oxidants, it also exhibits reducibility. If manganese dioxide, potassium carbonate and potassium nitrate or potassium chlorate are mixed and melted, a dark green melt can be obtained, and the melt can be dissolved in water and cooled to obtain potassium manganate, a compound of hexavalent manganese. It is a strong oxidant in acidic medium.
5. Strong oxidant, it does not burn by itself, but supports combustion, and should not be placed with flammable materials.
6. As a catalyst [1] in the reaction of potassium chlorate [KClO3] decomposition and hydrogen peroxide (hydrogen peroxide, H2O2) decomposition.

Manganese Dioxide Properties
Other Names	manganese oxide, MnO2 powder
CAS No.	1313-13-9
Compound Formula	MnO2
Molecular Weight	86.94
Appearance	Black Powder
Melting Point	535 °C
Boiling Point	N/A
Density	5.03 g/cm3
Solubility in H2O	Insoluble
Exact Mass	86.9279

Manganese Dioxide MnO2 CAS 1313-13-9

The applications of MnO2 Powder
1.Organic Synthesis Use
Manganese dioxide is very useful in organic chemistry. Manganese dioxide is used for oxides in different forms, because manganese dioxide has multiple crystalline forms, the chemical formula can be written as MnO2 x(H2O)n, where x is between 0 and 0.5, and n can be greater than 0 . Manganese dioxide can be produced by the reaction of potassium permanganate (KMnO₄) and manganese sulfate (MnSO₄) at different pH.
One of the chemical reactions specific to manganese dioxide is the conversion of alcohols to aldehydes. Even if the alcohols have double bonds, they will not be oxidized by manganese dioxide. No matter how active the product is, it will not be oxidized again. Diols can be oxidized to dialdehydes by manganese dioxide. There are many other manganese dioxide reactions and can be used to oxidize amines, aromatics and triols.
2.Laboratory use
It is used as a catalyst when hydrogen peroxide is decomposed to produce oxygen; it is used as a catalyst when potassium chlorate is decomposed by heating to produce oxygen; it can be used as aluminothermic reaction with elemental aluminum powder to obtain manganese. Used as pigment, yellow glass, etc.; react with hot concentrated hydrochloric acid to produce chlorine; react with molten caustic potash (potassium hydroxide) in the air to produce potassium manganate; in the decomposition reaction of potassium permanganate, manganese dioxide is used as high Potassium manganate autocatalyst.
The main supplier of MnO2 Powder
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