Ruthenium Supported On Bimetallic Oxides For Selective Hydrogenation Of 5-hydraxymethylfurfural

5-Hydroxymethylfurfural as one of the most promising biomass-based platform molecules is a bridge between the biomass and petroleum-based industries and a key material that can be derived from many furan chemical products by catalytic hydrogenation,dehydrogenation,esterification,halogenation and other chemical reactions.2.5-Dimethylfuran?DMF?is a new type of liquid bio-fuel comparable to gasoline,which can solve the shortcomings of ethanol as biomass fuel and can be prepared by catalytic hydrogenation of 5-hydroxymethylfurfural.Therefore,it is imperative to develop a catalyst for efficient conversion to DMF.The search for the right carrier is the most effective way to prepare high selectivity catalysts.Bimetallic oxide catalysis has been widely concerned,due to its acidity-basicity,stability and other characteristics in the field of heterogeneous.In this paper,we use metal oxide as the carrier and Ru metal as the active site of the catalyst,to explore the carrier of Ru metal catalyzed 5-hydroxymethyl furfural hydrogenation of the promotion of the role.Details are as follows:1.Ruthenium supported on CoFe Layered Double Oxide for selective hydrogenation of 5-hydroxymethylfurfuralIn this experiment,the noble metal Ru was loaded on the surface of MM-LDO?Co,Ni,Fe?to obtain different catalysts,and the catalytic hydrogenation of 5-hydroxymethylfurfural was investigated.Experiments show that Ru/Co Fe-LDO exhibits high catalytic activity.A series of characterization such as XRD,SEM,TEM,FT-IR,TGA and XPS were used to characterize the structure of the carrier and catalyst.The effects of reaction temperature,reaction time,reaction pressure,catalyst amount and calcination temperature on the catalytic performance are researched in this work and the possible reaction path is proposed.Moreover our results also showed the cooperation between the metallic Ru site and the Co Fe-LDO further facilitates the process of HMF hydrogenation to DMF.2.Highly selective hydrogenation of 5-hydroxymethylfurfural by Ru catalysts supported on Fe-Al metal oxide aerogels.In this experiment,M-Al hydroxide aerogels were prepared by constant PH-coprecipitation method,dried by supercritical ethanol and calcined to obtain M-Al metal oxide aerogels.The Ru-based catalyst with M-Al metal oxide aerogels as the carrier was used for the selective hydrogenation of HMF.The results showed that Ru/Fe-A exhibited pretty good activity and selectivity to DMF.Compared with the LDO,the metal oxide aerogels have the advantages of low density,high specific surface area,large pores and high thermal stability,and have high activity center dispersibility and better mass transfer performance.Experiments show that Fe-A shows a very good catalytic activity and selectivity to DMF.The stability of the catalyst was tested by repeated experiments,indicating that Ru/Fe-A had good catalytic performance and stability.3.Highly selective hydrogenation of 5-hydroxymethylfurfural by Ru catalysts supported on ZIFs templated metal oxide.In this study,the ZnCo₄O₅ composite oxide carrier with hollow structure was prepared by using ZIFs as template.Ru-based catalyst was prepared by traditional impregnation-reduction-precipitation method as the catalyst.The Ru-based catalyst with Zn Co4O5 composite oxide as the carrier was used for the selective hydrogenation of HMF.Compared with the LDO and metal oxide aerogels,the Zn Co4O5 composite oxide carrier with hollow structure has the advantages of dodecahedral structure,high specific surface area and high heat stability,and has high activity center and better dispersibility.The selectivity of DMF reached 95.3% with 3% Ru/Zn Co4O5 catalyst,indicating that Ru/Zn Co4O5 had better catalytic activity.The stability of the catalyst was tested by repeated experiments,indicating that Ru/Fe-A had good catalytic performance and stability.