Mechanism of the hydrogenation of pentynes and hexynes over raney nickel

Summary

• 1. The mechanism of the hydrogenation of n-pentynes and n-hexynes in presence of Raney nickel was studied by a method based on the poisoning of the catalyst with pyridine.

• 2. β- and γ-Acetylenic hydrocarbons are hydrogenated mainly with desorption of the olefin formed from the catalyst surface into the general reaction space.

• 3. α-Acetylenic hydrocarbons are hydrogenated by two mechanisms simultaneously: with and without desorption of the intermediately formed olefin into the general reaction space.