Palladium black

Palladium black
Names
IUPAC name
Palladium
Other names
Palladium black
Identifiers
7440-05-3
3D model (Jmol) Interactive image
EC Number 231-115-6
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.
This article is issued from Wikipedia - version of the 2/3/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.