Ultrafine Amorphous Alloy The Nib Catalytic ¦Á, ¦Â-unsaturated Aldehydes And Ketones To The Selective Hydrogenation Of The Study

On the basis of the high activity and high selectivity of the ultrafine amorphous alloy, the selective catalytic hydrogenation of a,β-unsaturated aldehyde and ketones with ultrafine amorphous NiB as catalyst was studied for the first time, which not only would enlarge the application range of the ultrafine amorphous alloy but also provide a new way for the industrial selective catalytic hydrogenation of a,β-unsaturated aldehyde and ketones.Five types of a, β-unsaturated aldehyde and ketones with industrial value were synthesized, and the selective catalytic hydrogenation of 2-butylenecyclohexanone at atmospheric pressure was emphatically researched. The experimental results showed that ultrafine amorphous NiB has great activity-the conversion and selectivity were both up to 99% at 80C. Moreover, the kinetics study confirmed the reaction order of this hydrogenation reaction: n=1. At 80C, the rate constant k of this quasi first-order reaction is equal to 3.4 X 10-3min-1, and the activation energy Ea is 16.391kJ/mol.In addition, the high selective catalytic hydrogenation of a -methyl-β-( p-tert-butyl) phenylpropenal was also realized with ultrafine amorphous NiB as catalyst and oxygenous group as ligand. With the optimal ligand, the conversion and the selectivity are 99% and 97.3% respectively. At the same time, the researched showed that the catalyst NiB had some kind of sensitivity to the reactant structure.Ultrafine amorphous NiB has higher activity and selectivity than Pd, but the cost is much lower. All these advantages provide a much cheaper way to selectively hydrogenate a,β-unsaturated aldehyde and ketones.