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Applications of manganese dioxide

wallpapers News 2021-08-05
Used as a depolarizer for dry batteries, a catalyst and oxidant in the synthesis industry, a coloring agent, a decolorizer, and an iron removal agent in the glass industry and enamel industry. Used in the manufacture of metal manganese, special alloys, ferromanganese castings, gas masks and electronic material ferrites, etc. In addition, it 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 for 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, ethers, 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 products in it will not be oxidized no matter how active it is. Diols can be oxidized to dialdehydes by manganese dioxide. Other manganese dioxide has many reactions and can be used to oxidize amines, aromatics and triols.
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.
It reacts with elemental aluminum powder to produce manganese by a thermite reaction.
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.

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