Preparation Of Ruthenium Catalyst And Its Application In Hydrogenation Reaction

Metal catalytic hydrogenation is considered to be one of the most important reactions in the industrial production of bulk chemicals and fine chemicals because of its advantages of high atomic efficiency,high product yield,high quality and low environmental damage.In this paper,two kinds of ruthenium supported catalysts with different properties（Mg-Ce mixed oxide and alkaline earth metal carbonate）are synthesized by simple preparation method,and the catalytic hydrogenation tests of furfural and quinoline compounds are carried out respectively.Both catalysts show high catalytic activity.Through the analysis of the microstructure and composition structure of the catalyst,the possible reasons for the performance improvement of the catalyst are discussed.The main research contents of this paper are as follows:（1）Mg O-Ce O₂ precursors with different Mg/Ce ratios are prepared by hydrothermal method,and then supported Ruthenium catalysts are prepared by initial wet impregnation and reduction calcination.Among them,Ru/Mg（OH）₂-Ce O₂-0.2 catalyst showed excellent activity and selectivity in catalytic hydrogenation reduction of furfural.Under mild conditions（120 ^oC,5 bar）,Ru/Mg（OH）₂-Ce O₂-0.2 has a furfural conversion of 92.6%and a high selectivity for furfural alcohol of 96.3%.Under the same conditions,the furfural conversion of Ru/Mg（OH）₂increases by 61.2%compared with that of the catalyst without Ce adding.Ce can effectively prevent the agglomeration and leaching of Ru NPs,and improve the stability of the catalyst.In addition,the strong metal-carrier interaction between Ce O₂ and Ru significantly increases the concentration of oxygen vacancy on the catalyst surface,which is conducive to improving the desorption capacity of Ru for hydrogen and CO.（2）A class of alkaline earth metal carbonate supported Ruthenium nanocomposite catalysts are successfully prepared by simple processes such as initial impregnation,vacuum drying and calcination,which show high efficiency in selective hydrogenation of quinoline.Among them,Ru/Ca CO₃ has the best performance and can efficiently hydrogenate quinoline under mild conditions（70℃,4 bar H₂ and 4 h）,with both conversion and selectivity greater than 99%.In addition,the interaction between ruthenium and calcium carbonate improves the activity of ruthenium nanoparticles,and the composite has good stability and abundant adsorption and activation sites for hydrogen and quinoline,which makes it an excellent hydrogenation catalyst for quinoline compounds.