What are the properties of manganese dioxide?

What is manganese dioxide?

Manganese dioxideis 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: insoluble in water, weak acid, weak base, nitric acid, cold sulfuric acid, heating and crushing concentrated hydrochloric acid to generate chlorine. Manganese dioxide can be used to prepare manganese salts, as well as oxidants, rust removers, and catalysts.

Is there any other name for manganese dioxide?

manganese dioxide. Manganese oxide (IV). Other names. Pyrolusite, manganese peroxide, manganese black oxide, manganese oxide.

Why is MnO2 not a peroxide?

Peroxide contains two oxygens connected by a single bond. X-ray or neutron diffraction will show that the oxygen in MnO2 is too far apart to bond, so it is not a peroxide.

It is well known that peroxides are ligands for transition metals (although it is sometimes not always clear to describe them as peroxides or superoxides, for example in certain cobalt species). One example you might encounter in the laboratory is chromium peroxide (VI), or CrO5.

What are the properties of manganese dioxide?

Physical properties: black amorphous powder, or black rhombus crystals. Solubility: insoluble in water, weak acid, weak base, nitric acid, cold sulfuric acid, and soluble in concentrated hydrochloric acid to produce chlorine when heated.

Chemical properties: Manganese dioxide is an amphoteric oxide. There are corresponding salts in the form of perovskite structure, such as BaMnO3 or SrMnO3 (obtained by compound reaction in molten alkali system). There is also manganese tetrachloride.

Overview of manganese dioxide

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: insoluble in water, weak acid, weak base, nitric acid, cold sulfuric acid, heating and crushing concentrated hydrochloric acid to generate chlorine.

 MnO2 is an alpha polymorph that can bind various atoms (and water molecules) in the "tunnels" or "channels" between the manganese oxide octahedrons. People are very interested in α-MnO2 as a possible cathode for lithium ion batteries.

 Manganese dioxide is an amphoteric oxide. It is a very stable black powdery solid at room temperature and can be used as a depolarizer for dry batteries. It is often used in the laboratory to produce chlorine through its oxidizing properties and the action of concentrated hydrochloric acid. Manganese dioxide is a strong oxidant in acid medium. Manganese dioxide is [MnO2] octahedron. The oxygen atom is on the top of the octahedron, and the manganese atom is in the octahedron. [MnO2] Octahedrons are joined together to form single or double strands. These chains and other chains together form a void, octahedral or hexagonal close-packed, or square close-packed tunnel structure.

Manganese dioxide is an amphoteric oxide, and there are corresponding salts in the perovskite structure, such as BaMnO3 or SrMnO3 (obtained through a compound reaction in a molten alkali system), and manganese tetrachloride is also present.

Application of manganese dioxide

Used as a depolarizer for dry batteries, a catalyst and oxidant in the synthesis industry, a coloring agent, decolorizer, and 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 forms of manganese dioxide used for oxides vary. 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.

One of the special chemical reactions for 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 to produce oxygen; as a catalyst for heating potassium chlorate to decompose to produce oxygen; thermite reaction with elemental aluminum powder to produce manganese. Used as pigments, yellow glass, etc.; react with hot concentrated hydrochloric acid to produce chlorine; react with molten caustic potassium (potassium hydroxide) in the air to produce potassium manganate; in the decomposition reaction of potassium permanganate, manganese dioxide is used as high Self-catalyst of potassium manganate.

Manganese dioxide price

The price of manganese dioxide will vary with random factors such as production cost of manganese dioxide, transportation cost, international situation and market supply and demand for manganese dioxide. Tanki New Materials Co., Ltd. aims to help various industries and chemical wholesalers find high-quality, low-cost nanomaterials and chemicals by providing a full set of customized services. If you are looking for manganese dioxide, please feel free to send an inquiry to get the latest price of manganese dioxide.

Suppliers of Manganese Dioxide

As a global manganese dioxide supplier, Tanki New Materials Co., Ltd. has extensive experience in the performance, application and cost-effective manufacturing of advanced engineering materials. The company has successfully developed a series of powder materials (including chromium carbide, aluminum carbide, manganese dioxide, titanium carbide, etc.), high-purity targets, functional ceramics and structural devices, and provides OEM services.