What is Manganese dioxide?
is an inorganic compound with the chemical formula MnO2, which exists in the form of pyrolusite in nature. Physical properties: black amorphous powder, or black orthorhombic crystals. Solubility: hardly soluble in water, weak acid, weak base, nitric acid, cold sulfuric acid, pulverize concentrated hydrochloric acid under heating to produce chlorine. Manganese dioxide can be used in the preparation of manganese salt, also can be used as an oxidant, rust remover, catalyst.
Manganese dioxide performance
Physical properties: black amorphous powder, or black rhombic crystals. Solubility: Difficult to dissolve in water, weak acid, weak base, nitric acid, cold sulfuric acid, and dissolve in concentrated hydrochloric acid under heating to produce chlorine gas.
Chemical properties: Manganese dioxide is an amphoteric oxide. There is a corresponding salt in the form of a perovskite structure such as BaMnO3 or SrMnO3 (obtained by a compound reaction in a molten alkali system). There is also manganese tetrachloride.
When meeting the reducing agent, it shows an oxidizing property. If manganese dioxide is placed in a stream of hydrogen and heated to 1400K to obtain manganese oxide; manganese dioxide is heated in a stream of ammonia to obtain brown-black manganese trioxide; reacting manganese dioxide with concentrated hydrochloric acid produces l chloride Manganese chloride, chlorine and water.
When it meets strong oxidants, it also shows a reducing property. It is a strong oxidant in an acid medium.
Manganese dioxide applications
can be used as a dry cell depolarizing agent, catalyst and oxidizer for synthetic industry, glass industry and enamel industry colorant, bleaching agent, iron removal agent, etc. Manganese dioxide can be used to manufacture manganese metal, special alloys, ferromanganese castings, gas masks and electronic materials such as ferrite. 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.
Manganese dioxide is very useful in organic chemistry. Manganese dioxide is used for oxides of manganese dioxide in different forms because it 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 formed from the reactions of potassium permanganate (KMnO₄) and Manganese sulfate (MnSO₄) at different pH values. One chemical reaction specific to manganese dioxide is the conversion of alcohols to 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
No matter how active the product is, it doesn't get oxidized again. Diols can be oxidized to dialdehyde by manganese dioxide. Other reactions of manganese dioxide are very many and can be used in the oxidation of amines, aromatic substances and triols
Manganese dioxide is used as a catalyst when hydrogen peroxide is decomposed to produce oxygen, and as a catalyst when potassium chlorate is heated to produce oxygen.
Manganese is produced by an aluminothermic reaction with elemental aluminum powder.
Used as a pigment, yellow glass, manganese dioxide reacts with hot concentrated hydrochloric acid to produce chlorine gas and reacts with molten potash (potassium hydroxide) in the air to produce potassium manganate. In the decomposition reaction of potassium permanganate, manganese dioxide acts as a self-catalyst of potassium permanganate.
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