Overview of Manganese Dioxide MnO2:
Manganese dioxide MnO2 is black amorphous powder or black diamond crystals.Solubility: hardly soluble in water,weak acid,weak base,nitric acid,cold sulfuric acid,insoluble in concentrated hydrochloric acid when heated,generating chlorine gas.
Chemical properties: Manganese dioxide is an amphoteric oxide.There are corresponding salts in the form of perovskite structures,such as BaMnO3 or SrMnO3 (obtained by compound reaction in a molten alkali system).There is also manganese tetrachloride.
When encountering reducing agents,it shows oxidizing properties.If manganese dioxide is placed in a hydrogen stream and heated to 1400K to obtain manganese oxide; Manganese dioxide is heated in an ammonia stream to obtain brown-black manganese trioxide. Manganese dioxide reacts with concentrated hydrochloric acid to produce chloride,manganese chloride, chlorine and water.
When encountering strong oxidants,it also shows reducibility.It is a strong oxidant in acidic medium.
Application of Manganese Dioxide MnO2:
What are the uses of manganese dioxide MnO2?
Manganese dioxide MnO2 is mainly used as a depolarizer for dry batteries, as a catalyst and oxidant in the synthesis industry, and as a colorant, decolorizer, and iron removal agent in the glass industry and enamel industry. Used in the manufacture of metal manganese, special alloys, manganese iron castings, gas masks and electronic material ferrites.In addition, manganese dioxide can also be used in the rubber industry to increase the viscosity of rubber.It can also be used as a catalyst in chemical experiments.
Organic synthesis use: Manganese dioxide is very useful in organic chemistry. The manganese dioxide used in oxides has different forms.Because manganese dioxide has multiple crystal 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 in the reaction of potassium permanganate (KMnO₄) and manganese sulfate (MnSO₄) at different pH. The brown manganese dioxide precipitate is very dry and very active.The most effective organic solvents include aromatic substances, carbon tetrachloride, ether, tetrahydrofuran and esters.
One of the chemical reactions dedicated to manganese dioxide is to convert alcohols into aldehydes. Even if the alcohol has a double bond, it will not be oxidized by manganese dioxide: cis-RCH=CHCH2OH + MnO2 → cis-RCH=CHCHO + H2O + MnO
The product in it will not be oxidized no matter how active it is. Diols can be oxidized by manganese dioxide to dialdehydes. Other manganese dioxide has many reactions and can be used to oxidize amines, aromatics and triols.
To Laboratory use
Used as a catalyst for the decomposition of hydrogen peroxide (hydrogen peroxide) to produce oxygen.Used as a catalyst when heating potassium chlorate to decompose to produce oxygen.The aluminothermic reaction with elemental aluminum powder produces manganese.Used as pigments, yellow glass, etc. React with hot concentrated hydrochloric acid to produce chlorine.It reacts with molten caustic potassium (potassium hydroxide) in the air to prepare potassium manganate.
In the decomposition reaction of potassium permanganate, manganese dioxide acts as a self-catalyst for potassium permanganate.
Manganese dioxide MnO2 price:
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Suppliers of Manganese Dioxide MnO2:
As a global supplier of manganese dioxide MnO2,Tanki New Materials Co.,Ltd has extensive experience in the performance,application and cost-effective manufacturing of advanced and engineered materials.The company has successfully developed a series of powder materials (including carbonization Boron,aluminum carbide,titanium carbide,etc.),high-purity targets,functional ceramics and structural devices,and provide OEM services.