Study On Polymeric Micelles Stabilized Metal Nanoparticles As A Catalyst For Hydrogenation Of Α-pinene

This article from the perspective of environmental friendly catalyst, Selected the green reaction medium and recycled catalyst to study the selective hydrogenation of α-pinene. The catalytic system used water as the reaction medium and environmentally friendly. The catalytic activity was high and the reaction could be carried out under mild conditions. The catalyst and the product were easily separated and the catalyst wass effectively recycled. This article mainly contained the following four systems:Ru nanoparticles were prepared using F127 micelles as stabilizers. The F127-Ru micellar catalyst was used in the hydrogenation of α-pinene to cis-pinane. Under very mild conditions, the conversion of α-pinene was 99.9%, and selectivity for cis-pinane reached 99.0%, and the isolated catalyst phase could be reused six times. The reaction follows standard pseudo-first-order kinetics for α-pinene at the experimental system.Ruthenium(Ru) nanoparticles were prepared using P123 micelles in water as the stabilizing agent. The catalyst was used in the hydrogenation of α-pinene, and the selectivity for cis-pinane reached 98.9%. The isolated catalyst phase could be used seven times with no treatment, and its catalytic activity and selectivity were almost unchanged.TPGS-1000 stabilized Ru(0) nanoparticles were prepared and characterized. These nanoparticles were employed to selectively hydrogenate α-pinene to cis-pinane, with a small amount of Na2CO3 present, reaction rates could be increased significantly, and the reaction media could be readily recycled. The catalyst was characterized by TEM, CLSM, IR and leaching experiments.In P123 micellar system, Pd/Ni nanoparticles were prepared using NaBH4 as the reducing agent. The catalyst was used in hydrogenation of α-pinene, and obtained the optimum preparation conditions. Under the optimal reaction conditions, the conversion of α-pinene was 99.8%, and the selectivity for cis-pinane reached 96.3%. In the case of the catalytic activity was not reduced, the catalytic systems reduced the use of precious metal Pd, this had important significance.This paper established polymeric micelles stabilized metal nanoparticles as catalyst for hydrogenation of α-pinene, realized α-pinene hydrogenation under mild conditions. Furthermore, high selectivity for cis-pinane and the catalytic system was environmentally friendly. This paper offered an effective method for high-value-added α-pinene, and provided a reference for other hydrophobic natural products in hydrogenation reactions.