Palladium black
Chemical compound
From Wikipedia, the free encyclopedia
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]
| Names | |
|---|---|
| IUPAC name
Palladium | |
| Other names
Palladium black | |
| Identifiers | |
3D model (JSmol) |
|
| ChEBI | |
| ChemSpider | |
| EC Number |
|
PubChem CID |
|
| UNII | |
| |
| |
| Properties | |
| Pd | |
| Molar mass | 106.42 |
| Appearance | Black powder |
| Solubility | Organic solvents |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
| |
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.[2]
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[3] while the palladium(II)-ammonium chloride route employs a solution of formic acid followed by the precipitation of the catalyst using potassium hydroxide.[4]