Partially deactivated palladised charcoal is known as Lindlar’s catalyst.
- The catalyst is used for the hydrogenation of alkynes to alkenes (i.e. without further reduction into alkanes).
- Lindlar catalysts are heterogeneous catalysts.
- It is composed of palladium that is deposited on calcium carbonate (CaCO3) and then poisoned by suitable catalytic poisons, the most common of which being lead and sulfur.