The Intrinsic Kinetics of Catalytic Hydrogenationof αPinene on Raney Nickel

AbstrcatGas holdup and reaction effect in highpressure kettles were determined with different types of stirrers, which showed that catalytic hydrogenation of αpinene on Raney nickel was affected badly by external diffusion. It was experimentally found that the external diffusion effect can be eliminated by changing stirrer types and rising rotational speed, and the internal diffusion effect can be eliminated by changing the granularity of Raney nickel, which made the reaction processing in the controlling region of chemical kinetics. Based on kinetic data, the reaction mechanism was determined by screening 17 probable reaction mechanism models, i.e. surface reaction between atomically adsorbed hydrogen and adsorbed αpinene on catalyst surface could be the controlling step, the intrinsic kinetic equation could be written as: r=kbAcAαHPHbH(1+bAcA+bHαHPH+bScS)3.