Study On Phenol And Benzene Selective Hydrogenation Reaction

Cyclohexanone and cyclohexene are the very vital intermediate for the production of organic chemical industrial products, which has found significant applications in the organic chemical industry. There have been a lot of methods for the synthesis of cyclohexanone and cyclohexene,which appear a great deal of difficult problems. Comparatively, the selective hydrogenation of phenol and benzene to Cyclohexanone and cyclohexene bring a promising future for development since it have the advantages of rich raw materials, shorter process route. we prepared and characterized a series of catalysts and their catalytic properties in the selective hydrogenation of phenol to cyclohexanone and in the selective hydrogenation of benzene to cyclohexene were performed.First, the reaction process of selective hydrogenation of phenol to cyclohexanone was studied.Then, under Ru/ZrO2 as the catalyst, hydrogen as the reducing agent and cyclohexane as reaction solvent, phenol was reduced to cyclohexanone. Under the optimum conditions(120 ℃, 3.0 MPa), the conversion of phenol can reach 33.9% and the selectivity of cyclohexanone is 43.2%. Through the FT-IR, UV-Vis, N2adsorption-desorption, XRD, TEM and other characterization methods to analyze the structure of the prepared catalysts.Second, the reaction process of selective hydrogenation of benzene to cyclohexene was studied.Then, using different methods prepared a series of rutheniumcatalysts, hydrogen as the reducing agent and deionized water as reaction solvent, benzene was reduced to cyclohexene. Under the optimum conditions(150℃,4.5 MPa), the conversion of benzene can reach 21.1 %and the selectivity of cyclohexene is 32.0 %. Through TEM, laser particle size measuring instrument and other characterization methods to analyze the structure of the prepared catalysts.