Catalytic Hydrogenation of Dibutyl Phthalate to Cyclohexane1,2-dicarboxylic Acid Dibutyl Ester over Ru/Al2O3 Catalyst
1. College of Chemistry and Chemical Engineering, Nanjing Tech University, Nanjing 210009, China;
2. Catalytic Hydrogenation Engineering Technology Research Center, Nuomeng Chem, Nanjing 210009, China
Abstract Ru/Al2O3 catalysts were prepared by the impregnation method and catalytic hydrogenation of dibutyl phthalate to cyclohexane 1,2-dicarboxylic acid dibutyl ester was carried out in a high pressure reactor. The samples were characterized by X-ray diffraction(XRD), scanning electron microscope(SEM), H2 temperature-programmed reduction(H2-TPR), energy dispersive spectrometer(EDS) and transmission electron microscope(TEM). The results showed that Ru/Al2O3 catalyst with Ru loading of 3% exhibited excellent catalytic performance when reduced at 200 ℃. The dibutyl phthalate conversion and 1,2-dicarboxylic acid dibutyl ester selectivity reached 99.904 % and 99.972 %, respectively, under the conditions of 80 ℃, 2.0-2.5 MPa and stirring speed of 800 r/min. Ru/Al2O3 catalyst showed the catalytic stability till reuse nine times. The deactivation of Ru/Al2O3 catalysts was mainly due to the loss and aggregation of Ru and carbonization over catalysts surface.
