Preparation of Pd/MoS2 Flower-Like Superstructures for Photothermal Catalysis of Suzuki Coupling Reaction
Pd has been widely used as a highly active noble metal catalyst for organic reactions such as Suzuki coupling re-action.To improve its catalytic performance for Suzuki coupling reaction,Pd/MoS2 flower-like superstructures were designed and prepared by using MoS2 with photothermal effect as the carrier.Firstly,MoS2 flower-like superstructures were synthe-sized by a simple hydrothermal method,and they were constructed from nanosheets with diameters of 200～300 nm and thicknesses of about 7 nm.Pd nanoparticles with diameters of about 11 nm were loaded on the surface of MoS2 by a reduction route.Subsequently,by using Pd/MoS2 flower-like superstructures as the catalyst,the conversion efficiency of Suzuki cou-pling reaction was investigated under both laser heating and oil bath heating conditions.When the intensity of 808 nm laser as heating sources went up from 1 to 4 W/cm2,the equilibrium temperature of solution from laser heating increased from 29.4 to 60.8 ℃.Accordingly,the photothermal catalysis yield enhanced from 30.5％to 86.3％,which was significantly higher than the thermocatalytic yield(from 24.3％to 60.4％)at the same temperature from oil bath heating.When the reaction temperature was 40 ℃,the photothermal catalysis rate was 1.5 times as high as that of the thermal catalysis.Therefore,Pd/MoS2 flower-like superstructures show good photothermal catalytic perform-ance,which assists in the design of highly active catalysts for Suzuki coupling reaction.
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