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(chemistry, transitive) To treat something, or react something, with hydrogen; especially to react an unsaturated fat with hydrogen, in the presence of a nickel catalyst, to produce a harder saturated fat.

Steps in the hydrogenation of a C=C double bond at a catalyst surface, for example Ni or Pt : (1) The reactants are adsorbed on the catalyst surface and H₂ dissociates. (2) An H atom bonds to one C atom. The other C atom is still attached to the surface. (3) A second C atom bonds to an H atom. The molecule leaves the surface.

(chemistry, transitive) To treat something, or react something, with hydrogen; especially to react an unsaturated fat with hydrogen, in the presence of a nickel catalyst, to produce a harder saturated fat.

Mechanism for the hydrogenation of a terminal alkene using Wilkinson's catalyst.

(chemistry, transitive) To treat something, or react something, with hydrogen; especially to react an unsaturated fat with hydrogen, in the presence of a nickel catalyst, to produce a harder saturated fat.

Selective hydrogenation of the less hindered alkene group in carvone using a homogeneous catalyst (Wilkinson's catalyst).