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 2 Nishimura, Shigeo (2001). Handbook of Heterogeneous Catalytic Hydrogenation for Organic Synthesis (1st ed.). Newyork: Wiley-Interscience. pp. 34–35. ISBN 9780471396987.
- ↑ 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.
- ↑ Zelinsky, N.; Glinka, N. (1911). "Über gleichzeitige Reduktions- und Oxydationskatalyse". Berichte der deutschen chemischen Gesellschaft 44 (3): 2305–2311. doi:10.1002/cber.19110440347.