Preparation of hydrogenated nitrile-butadiene rubber (H-NBR) with controllable molecular weight with heterogeneous catalytic hydrogenation after degradation via olefin cross metathesis

Liquid hydrogenated nitrile-butadiene rubber (LH-NBR), hydrogenated nitrile-butadiene rubber (H-NBR) with number-averaged molecular weight of C C groups instead of the C N ones in the liquid nitrile-butadiene rubber (L-NBR) with narrow molecular weight distribution was conducted with palladium nanoparticles supported on macroporous hollow silica microspheres (Pd/MHS) catalyst, with the hydrogenation degree (HD%) > 95% for the 5th reuse.