Detailed reaction kinetic studies involving the hydrogenation of NBR were carried out in the presence of hydrogen storage alloys under mild reaction conditions(30—60℃

THF solvent

air atmosphere).Apparent activation energy(48.74 kJ8226;mol-1) of NBR hydrogenation reaction was obtained by changing reaction temperature.The lower apparent activation energy suggests that the substrate is activated easily and the reaction is relatively temperature-insensitive during hydrogenation of NBR solution catalyzed by hydrogen storage alloy.Hydrogenation selectivity of double bonds in NBR catalyzed by hydrogen storage alloy was investigated by characterization using IR and 1HNMR.The results showed that the 1

4-BD units were hydrogenated prior to 1

2-BD units. The kinetic results for the hydrogenation of trans-1

4-BD units and 1

2-BD units in NBR were also introduced.According to the kinetic and other experimental results

a reaction mechanism was presented which could explain most of expetimental results.