Palladium black

Palladium black
Names
IUPAC name
Palladium
Other names
Palladium black
Identifiers
7440-05-3
EC Number 231-115-6
Jmol interactive 3D Image
PubChem 23938
UNII 5TWQ1V240M
Properties
Pd
Molar mass 106.42
Appearance Black powder
Solubility Aqua regia
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Palladium black is a coarse, sponge-like form of elemental palladium which offers a large surface area for catalytic activity. It is used in organic synthesis as a catalyst for hydrogenation reactions.[1]

The term palladium black is also used colloquially to refer to a black precipitate of elemental palladium, which forms via decomposition of various palladium complexes.

Preparation

Palladium black is typically prepared from palladium(II) chloride or palladium(II)-ammonium chloride.[1] The palladium chloride process entails the formation of palladium hydroxide using lithium hydroxide followed by reduction under hydrogen gas[2] while the palladium(II)-ammonium chloride route employs a solution formic acid followed by the precipitation of the catalyst using potassium hydroxide.[3]

See also

References

  1. 1 2 Nishimura, Shigeo (2001). Handbook of Heterogeneous Catalytic Hydrogenation for Organic Synthesis (1st ed.). Newyork: Wiley-Interscience. pp. 34–35. ISBN 9780471396987.
  2. ↑ Nishimura, Shigeo; Itaya, Takashi; Shiota, Michio (1967). "Reactions of cycloalkanones in the presence of platinum-metal catalysts and hydrogen". Chemical Communications (London) (9): 422–423. doi:10.1039/C19670000422.
  3. ↑ Zelinsky, N.; Glinka, N. (1911). "Über gleichzeitige Reduktions- und Oxydationskatalyse". Berichte der deutschen chemischen Gesellschaft 44 (3): 2305–2311. doi:10.1002/cber.19110440347.
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