Title: Platinic Oxide
CAS Registry Number: 1314-15-4
Synonyms: Platinum dioxide; Adams' catalyst
Molecular Formula: O2Pt
Molecular Weight: 227.08
Percent Composition: O 14.09%, Pt 85.91%
Line Formula: PtO2
Literature References: Prepd by the interaction of platinic chloride and excess NaOH: W?hler,
Z. Anorg. Chem. 40, 434 (1904); Bellucci
ibid. 44, 171 (1905); by the reduction of chloroplatinic acid with formaldehyde: Willst?tter, Waldschmidt-Leitz,
Ber. 54, 113 (1921); Feulgen,
ibid. 360; by fusing chloroplatinic acid with sodium nitrate: Adams
et al., Org. Synth. 8, 92 (1928). Determination of orthorhombic (CaCl2) crystal structure of b-PtO2: Siegel
et al., J. Inorg. Nucl. Chem. 31, 3803 (1969).
Properties: Several hydrates have been reported; the compd generally used for catalysis is the monohydrate. Black powder. When freshly pptd it is sol in concd acids, also in dil H3PO4, esp when warmed. Easily sol in dilute solns of potassium hydroxide.
Use: As catalyst in hydrogenations. The actual catalyst is platinum black which is formed
in situ by reduction of the PtO2 by the hydrogen used for the hydrogenation. Especially useful for reduction at room temp and hydrogen pressures up to 4 atmospheres. Suitable for the reduction of double and triple bonds, aromatic nuclei, carbonyl groups, nitro groups, and nitriles.
