Controllable Synthesis And Preliminary Insight To Catalysis Performance Of Ru-based Nanoparticles

As an important noble metal catalyst,ruthenium(Ru)has high catalytic activity in heterogeneous catalysis such as CO oxidation,selective hydrogenation,and ammonia synthesis.But so far,the controlled synthesis of Ru metal nanoparticles only stays on the control of particle size,and there are relatively few researches in controlled of morphology.But there are few researches in controlled synthesis of morphology and size.In view of the above problems,the bimatallic RuCu and ternary RuCu nanoparticles were successfully prepared by liquid-phase chemical reduction method with acetylacetone fluorene,copper acetylacetonate and sodium molybdate as precursors,polyvinylpyrrolidone(PVP)as stabilizer,benzyl alcohol as reducing agent and solvent in this paper.Some results were presented below:(1)RuCu nanoparticles with a high degree of dispersion and morphology were prepared by liquid-phase chemical reduction with an average particle size of 29 nm.By detecting the electrochemical curves of nanoparticles at different time points in the synthesis process,the formation mechanism of RuCu nanoparticles was explored.It is that due to the underpotential deposition effect,Cu could form an underpotential deposition monolayer on the Ru surface.(2)The prepared highly dispersed hollow RuCuMo nanoparticles have a particle size of about 25 nm.The effects of the type of reducing agent,the molecular weight of PVP,the reaction time and the reaction temperature on the morphology and dispersibility of nanoparticles were explored.Among them,the type of reducing agent has a significant effect on the morphology of nanoparticles.By observing the TEM images of nanoparticles at different time points in the synthesis process,the formation of RuCuMo nanoparticles is due to the substitution reaction between Ru3+ and Cu and gradually becomes a hollow structure.(3)The synthesized bimetallic RuCu and ternary RuCuMo nanoparticles have catalytic properties for the electrocatalytic of methanol and hydrosilylation reactions.This study successfully synthesized ruthenium-based nanoparticle with certain catalytic activity,which laid the foundation for further investigation of the synthesis and catalysis of ruthenium-based nanoparticles.