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Rhodium oxide

Basic information Uses Preparation Safety Related Supplier
Rhodium oxide Basic information
Rhodium oxide Chemical Properties
  • Melting point:1100°C (dec.)
  • Density 8.2 g/mL at 25 °C(lit.)
  • storage temp. Inert atmosphere,2-8°C
  • form Powder
  • color Yellow
  • Specific Gravity8.2
  • Water Solubility Insoluble in water, acetone, conc. Hydrochloric acid, Nitric acid, Aqua regia.
  • Sensitive Hygroscopic
  • CAS DataBase Reference12036-35-0(CAS DataBase Reference)
  • EPA Substance Registry SystemRhodium oxide (Rh2O3) (12036-35-0)
Safety Information
  • Hazard Codes O;Xi,Xi,O
  • Risk Statements 36/38-8
  • Safety Statements 22-24/25-37/39-26-17
  • RIDADR 3288
  • WGK Germany 3
  • TSCA Yes
  • HazardClass 6.1(b)
  • PackingGroup III
  • HS Code 28259085
Rhodium oxide Usage And Synthesis
  • UsesRh2O3 is used to make rhodium metal and its various salts. Also, the oxide is a catalyst for hydrogenation.
  • PreparationRhodium 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.
  • Chemical PropertiesRhodium oxide is YELLOW POWDER
  • Physical propertiesGray 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.
  • UsesRH2o3 is used to make rhodium metal and its various salts. Also, the oxide is a catalyst for hydrogenation.
  • Production MethodsRhodium(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.
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