| Identification | More | [Name]
Rhodium oxide | [CAS]
12036-35-0 | [Synonyms]
Dirhodium trioxide
RHODIUM(+3)OXIDE
RHODIUM(III) OXIDE
rhodium oxide
RHODIUM SESQUIOXIDE
Rhodiumoxideanhydrousgraypowder
RHODIUM(III) OXIDE ANHYDROUS
RHODIUM(III) OXIDE, 99.8%
Rhodium(III)oxideanhydrous,99.9%(metalsbasis),Rh80.6%min
Rhodium(III) oxide hydrate, ca 56% Rh
Rhodium(III)oxide,anhydrous(99.9%-Rh)
RHODIUM(III)OXIDE,ANHDYDROUS
RHODIUM OXIDE ANDYDROUS
RHODIUM(III) OXIDE, ANHYDROUS: 99.9%
Rhodium oxide (Rh2O3)
Rhodium(III) oxide (solids)
Rhodium trioxide | [EINECS(EC#)]
234-846-9 | [Molecular Formula]
O3Rh2 | [MDL Number]
MFCD00011205 | [Molecular Weight]
253.81 | [MOL File]
12036-35-0.mol |
| Chemical Properties | Back Directory | [Appearance]
YELLOW POWDER | [Melting point ]
1100°C (dec.) | [density ]
8.2 g/mL at 25 °C(lit.)
| [storage temp. ]
under inert gas (nitrogen or Argon) at 2-8°C | [form ]
Powder | [color ]
Yellow | [Specific Gravity]
8.2 | [Water Solubility ]
Insoluble in water, acetone, conc. Hydrochloric acid, Nitric acid, Aqua regia. | [Crystal Structure]
Corundum type | [Sensitive ]
Hygroscopic | [crystal system]
Three sides | [Space group]
R3c | [Lattice constant]
| a/nm | b/nm | c/nm | α/o | β/o | γ/o | V/nm3 | | 0.5127 | 0.5127 | 1.3853 | 90 | 90 | 120 | 0.3154 |
| [Exposure limits]
ACGIH: TWA 1 mg/m3
NIOSH: IDLH 100 mg/m3; TWA 0.1 mg/m3 | [InChIKey]
XBBXDTCPEWHXKL-UHFFFAOYSA-N | [CAS DataBase Reference]
12036-35-0(CAS DataBase Reference) | [EPA Substance Registry System]
12036-35-0(EPA Substance) |
| Safety Data | Back Directory | [Hazard Codes ]
O;Xi,Xi,O | [Risk Statements ]
R36/38:Irritating to eyes and skin .
R8:Contact with combustible material may cause fire. | [Safety Statements ]
S22:Do not breathe dust .
S24/25:Avoid contact with skin and eyes .
S37/39:Wear suitable gloves and eye/face protection .
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S17:Keep away from combustible material . | [RIDADR ]
3288 | [WGK Germany ]
3
| [TSCA ]
Yes | [HazardClass ]
6.1(b) | [PackingGroup ]
III | [HS Code ]
28259085 |
| Questions And Answer | Back Directory | [Uses]
Rh2O3 is used to make rhodium metal and its various salts. Also, the oxide is a catalyst for hydrogenation.
| [Preparation]
Rhodium sesquioxide is obtained by heating rhodium metal to red heat in air.
4Rh + 3O2 → 2Rh2O3
Alternatively, Rh2O3 may be prepared by igniting rhodium nitrate, Rh(NO3)3.
Treating the sesquioxide with alkali first forms a yellow precipitate of pentahydrate, Rh2O3•5H2O, soluble in acid and excess alkali. In excess alkali a black precipitate of trihydrate, Rh2O3•3H2O is obtained. The trihydrate is insoluble in acids.
|
| Hazard Information | Back Directory | [Chemical Properties]
Rhodium oxide is YELLOW POWDER
| [Physical properties]
Gray crystalline solid or amorphous powder; corundum-type structure; density 8.20 g/cm3; decomposes at about 1,100 to 1,150°C; insoluble in water, acids, or aqua regia.
The pentahydrate Rh2O3?5H2O is a yellow precipitate; soluble in acids; partially dissolves in hot water; ignites to form anhydrous oxide.
The trihydrate Rh2O3?3H2O is a black precipitate; insoluble in acids. | [Production Methods]
Rhodium(III) oxide, Rh2O3, can be prepared by heating the finely divided metal or its nitrate in air or O2. The rhodium(IV) oxide is also known. Rhodium trihydroxide may be precipitated as a yellow compound by adding the stoichiometric amount of KOH to a solution of RhCl3. The hydroxide is soluble in acids and excess base. When the freshly precipitated Rh(OH)3 is dissolved in HCl at a controlled pH, a yellow solution is first obtained in which the aquochloro complex of Rh behaves as a cation. | [Flammability and Explosibility]
Notclassified | [reaction suitability]
reagent type: catalyst
core: rhodium |
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