The catalyst used in hydrogenation reaction is

The catalyst used in the hydrogenation reaction is nickel.
Hydrogenation involves an addition reaction in which hydrogen reacts with other compounds in the presence of a catalyst. In hydrogenation, unsaturated hydrocarbons get converted into saturated hydrocarbons. For example, hydrogenation converts the long unsaturated carbon chains in vegetable oil into saturated fatty acids, which is vegetable ghee. The catalyst which is mainly used in this reaction is nickel.