Quality Factory Hot Selling Chromium oxide 1308-38-9 with Fast Shipping
- Molecular Formula:Cr2O3
- Molecular Weight:151.99
- Appearance/Colour:green crystalline powder
- Melting Point:2435 °C, 2708 K, 4415 °F
- Refractive Index:2.551
- Boiling Point:4000 °C, 4273 K, 7232 °F
- Flash Point:3000 °C
- PSA：0.00000
- Density:5.22 g/cm3
- LogP:-0.35640
Chromium oxide(Cas 1308-38-9) Usage
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Physical properties
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Green hexagonal crystal system; corundum type structure; density 5.22 g/cm3; melts at 2,330°C; vaporizes above 3,000°C; insoluble in water and alcohol.
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Preparation
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Chromium(III) oxide can be obtained by thermal decomposition of ammonium dichromate. Above ca. 200 °C, a highly voluminous product is formed with elimination of nitrogen. The pigment is obtained after addition of alkali salts (e.g., sodium sulfate) and subsequent calcination. In the industrial process, a mixture of ammonium sulfate or chloride and sodium dichromate is calcined: Na2Cr2O7.2 H2O + (NH4)2SO4 →Cr2O3 + Na2SO4 + 6 H2O + N2
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Definition
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Chromium(III) oxide, Cr₂O₃, also known as chromic oxide or chrome green, is an inorganic compound that serves as a pigment, a catalyst in industrial processes, and has applications in radiation shielding. It is composed of chromium and oxygen in a 2:3 ratio and exists in a corundum-like crystalline structure. |
| Uses |
Chromium oxide is an active catalyst for the removal of halogenated volatile organic compounds (VOCs). It is used in oxidation reactions due to its ability to transition between multiple oxidation states (+2 to +5). Known as "chrome green," chromium oxide is used in paints, ceramics, and glasses for its yellowish-green hue and stability. Due to its high melting point, it is used in the production of refractory materials to line furnaces and kilns. |
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Reactions
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Chromium(III) oxide is amphoteric. Although insoluble in water, it dissolves in acid to produce hydrated chromium ion, [Cr(H2O)6]3+. It dissolves in concentrated alkali to yield chromite ion. When heated with finely divided aluminum or carbon it is reduced to chromium metal: Cr2O3 + 3Al2Cr + Al2O3 Heating with chlorine and carbon yields chromium(III) chloride: Cr2O3 + 3Cl2 + 3C2CrCl3 + 3CO If chromium(III) oxide (also known as chrome green) is heated with potassium carbonate and potassium nitrate, the mixture slowly turns yellow. This colour change stems from the formation of potassium chromate, K2CrO4, in which chromium is found in oxidation state vi.
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Hazard
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Toxic by ingestion and inhalation.
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Flammability and Explosibility
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Notclassified
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Safety Profile
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Confirmed carcinogen with experimental tumorigenic data. Mutation data reported. Probably a severe. Chromium oxide is toxic if ingested or inhaled. Long-term exposure can cause respiratory irritation, skin allergies, and potentially cancer. Handling requires protective gear such as gloves, goggles, and respirators to prevent skin contact and inhalation.
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Potential Exposure
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Chromium(III) oxide is used as a paint pigment, a fixative for certain textile dyes; in the manufacture of chromium; and a catalyst.
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Properties and Applications
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TEST ITEMS SPECIFICATION APPEARANCE GREEN POWDER CONTENT OF Cr 2 O 3 85% min SHADE YELLOWISH HYDROTROPE 0.5% max OIL ABSORPTION 25% max RESIDUE ON 45 MESH 0.1% max WATER SOLUBLE 0.3% max VOLATITE 105 °C 0.05% max TINTING STRENGTH 95-100 % pH VALUE OF AQUEOUS SUSPENSION 5-8
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TEST ITEMS
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SPECIFICATION
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APPEARANCE
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GREEN POWDER
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CONTENT OF Cr 2 O 3
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85% min
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SHADE
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YELLOWISH
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HYDROTROPE
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0.5% max
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OIL ABSORPTION
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25% max
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RESIDUE ON 45 MESH
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0.1% max
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WATER SOLUBLE
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0.3% max
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VOLATITE 105 °C
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0.05% max
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TINTING STRENGTH
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95-100 %
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pH VALUE OF AQUEOUS SUSPENSION
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5-8
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Incompatibilities
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A strong oxidizer. Contact with reducing agents; organics, and combustibles may be violent
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InChI:InChI=1/2Cr.3O/rCr2O3/c3-1-5-2-4
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