Adams' catalyst

Adams' catalyst, also known as platinum dioxide, is usually represented as platinum(IV) oxide hydrate, PtO2•H2O. It is a catalyst for hydrogenation and hydrogenolysis in organic synthesis. This dark brown powder is commercially available. The oxide itself is not an active catalyst, but it becomes active after exposure to hydrogen whereupon it converts to platinum black, which is responsible for reactions.

Adams' catalyst
Names
IUPAC name
Platinum(IV) oxide
Other names
platinum dioxide, platinic oxide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.013.840
UNII
  • InChI=1S/2O.Pt Y
    Key: YKIOKAURTKXMSB-UHFFFAOYSA-N Y
  • InChI=1/2O.Pt/rO2Pt/c1-3-2
    Key: YKIOKAURTKXMSB-FVLSDXBIAR
  • O=[Pt]=O
Properties
PtO2
Molar mass 227.08 g/mol
Appearance black solid
Density 10.2 g/cm3
Melting point 450 °C (842 °F; 723 K)
insoluble
Solubility insoluble in alcohol, acid, aqua regia
soluble in caustic potash solution
−37.70·10−6 cm3/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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