Mangandioxid
MnO2 · MANGANESE(IV) OXIDE · dioxomanganese · PYROLUSITE · ACTIVATED MANGANESE DIOXIDE · oxidizing agent · Manganese oxide (MnO2) · MANGANESE (IV) DIOXIDE
Identifikatoren & physikalische Daten
| CAS No. | 1313-13-9 |
|---|---|
| Summenformel | MnO2 |
| Durchschnittliche Molmasse | 86,94 g/mol |
| SMILES | [Mn].[O-2].[O-2] |
| PubChem CID | 10197621 |
| Lokaler Name | Mangandioxid |
Chemische & physikalische Eigenschaften
| Schmelzpunkt | 535 °C (dec.) (lit.) |
|---|---|
| Dichte | 5.02 |
| Dampfdruck | 0-0Pa at 25℃ |
| Lagerbedingungen | Store below +30°C. |
| Löslichkeit | <0.001g/l insoluble |
| Aggregatzustand | powder |
| Farbe | gray |
| Wichte | 5.026 |
| Spezifische Wärmekapazität | Cp(crystal): 0.62 J/(g·K), at 25℃ |
| Merck | 14,5730 |
| Stabilität | Stable. Incompatible with strong acids, strong reducing agents, organic materials. |
| Kosmetik-Inhaltsstoffe Funktionen | ANTIOXIDANT |
| InChI | 1S/Mn.2O |
| InChIKey | NUJOXMJBOLGQSY-UHFFFAOYSA-N |
| SMILES | O=[Mn]=O |
| CAS Datenbank | 1313-13-9(CAS DataBase Reference) |
| NIST chemische Informationen | manganese(IV) dioxide(1313-13-9) |
| EPA chemische Informationen | Manganese dioxide (1313-13-9) |
Sicherheit & Vorschriften
| Wassergefährdungsklasse (WGK) | 1 |
|---|---|
| TSCA-Inventar-Status | TSCA listed |
| UN-Transportnummer | 3137 |
| Zollcode | 2820 10 00 |
| RTECS-Nr. | OP0350000 |
| R-Sätze (R) | 20/22 |
| Toxizität | LD50 orally in rats: >40 mmole/kg (Holbrook) |
| Gefahrensymbole | Xn |
| Sicherheitshinweise (S) | 25 |
| Verpackungsgruppe | III |
| Lagerklasse | 13 - Non Combustible Solids |
| Gefahrenklasse | Acute Tox. 4 InhalationAcute Tox. 4 OralSTOT RE 2 Inhalation |
Anwendungen & Verwendung
Verwenden
As an oxidizing agent, source of metallic manganese, decolorizing glass, painting porcelain, as an analytical reagentManganese(IV) oxide is used as an oxidizing agent in organic synthesis such as oxidation of allylic/benzylic alcohols, as a textile dye, as a reducing agent, and as a component of dry cell batteries such as zinc-carbon battery and alkaline battery. It is also used in making pigments for glasses and ceramics, and drier for paints. Further it is used in the manufacture of manganese steel and several manganese derivatives including potassium permanganate, a powerful versatile oxidant. Catalytic hydration of nitriles to amides by flowing through manganese dioxide has been reported. Manganese dioxide supported on inorganic oxide can be used for oxidation of methylamine through CWAO (Catalytic Wet Air Oxidation). It has high potential as highly efficient and robust material for water oxidation reaction (WORs).
Herstellung & Synthese
synthetische
Pure manganese(IV) oxide (precipitate form) may be prepared by reducing permanganate ion with a manganous salt: 2KMnO4 + 3MnSO4 + 2H2O → 5MnO2 + K2SO4 + 2H2SO4 Manganese(IV) oxide can also be precipitated by oxidation of a manganese(II) salt using an oxidizing agent such as hypochlorite or peroxydisulphate: Mn2+ + S2O82– + 2H2O → MnO2 + 2SO42– + 4H+ Manganese(IV) oxide may also be made by thermal decomposition of manganese(II) nitrate; or from roasting manganese(II) carbonate in air: Mn(NO3)2 → MnO2 + 2NO2 MnCO3 + ½ O2 → MnO2 + CO2 A highly active gamma-MnO2 can be produced by treating manganese(III) oxide with hot sulfuric acid: Mn2O3 + H2SO4 → MnO2 + MnSO4 + H2O Mn2O3 is derived from pyrolusite by heating the mineral at 600–800°C or reducing with powdered coal at 300°C.