Study Of Ru/NaY Nanoparticle Catalysts By Microemulsion Method For Catalytic Hydrogenation Of Hydroquinone

Microemulsion is a disperse system mixture of oil phase water phase and surfactant(cosurfactant).Microemulsion has unique physicochemical property and uses these characteristic to be applied to all fields,has tremendous application potential for development.In W/O microemulsion system,as a "nano-micro-reactor" of the water nucleus is used to prepare nanoparticles and apply the technique to the preparation of czatalysts.W/O microemulsion method preparation of supported nano-metal catalysts,which can accurately control the size of metal nanoparticles.Each"nano-micro-reactor" of the water nucleus is independent.so metal nanoparticles are hard to gather.This paper is using TritonX-100,n-hexanol,n-heptane and RuCl3·3H2O aqueous solution to form microemulsion.The ruthenium nanoparticles were prepared by the hydrate hydrazine reducing.The demulsifier was added to the ruthenium microemulsion system,the Ru nanoparticles were loaded on the NaY to get the M-Ru/NaY catalysts.application in the hydrogenation of hydroquinone to 1,4-cyclohexanediol.1,4-cyclohexanediol is an important pharmaceutical intermediate and a new material monomer.Currently,the production of this product is less in China,and the study of hydrogenation catalyst for this reaction is particularly important.The M-Ru/NaY catalysts were characterized by XRD,BET,XPS,SEM,TEM,and DSC.These analyzed The surface morphology,distribution and the size of the active component ruthenium granules.The results of characterization show that the M-Ru/NaY catalysts have the advantages of the average size of Ru particles is small(1～2 nm),uniformly and highly dispersed.In this paper,Comparing with the Ru/NaY catalysts prepared by microemulsion and impregnation,The result show that the M-Ru/NaY catalysts is better.And comparing with the two reduction methods for the M-Ru/NaY catalysts with microemulsion.Hydrazine hydrate liquid phase reduction is an effective and feasible reduction method in the preparation of the M-Ru/NaY catalysts in microemulsion.The optimum reaction conditions were optimized,the results show that reaction temperature 150 ℃,hydrogen pressure of 4.0 MPa,m(M-Ru/NaY):m(hydroquinone)= 0.2:1 and the solvent is isopropyl alcohpl.Under the optimum reaction conditions,when the ruthenium load was at 2.0 wt%.the conversion rate of hydroquinone was 100%,and the selectivity of 1,4-cyclohexanediol was up to 92.63%.The reaction can be completed quickly after 30 minutes.And,the M-Ru/NaY catalyst has good stability.Finally,the reaction pathways were also analyzed preliminarily.