Wu Yuan-xin
2013
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Journal
Journal of Molecular Catalysis
Abstract
Four types of catalysts[1,1′-Bis(diphenylphosphino)ferrocene] dichloropalladium(DPPF),[1,2-Bis(diphenylphosphino) ethane] dichloropalladium(DPPE),(1,3-Bis(diphenylphosphino)propane)palladium(II) chloride(DPPPr),1,4-Bis(diphenylphosphino)butane-palladium(II) chloride(DPPB) were synthesized using diphenylphosphino as the ligand and PdCl2 as the active component.The catalysts were characterized by different techniques including IR,1H-NMR,EA and TG.In addition,the catalytic performance and reactive parameters of different catalysts were investigated in the oxidation of phenol to diphenyl carbonate.The optimized catalytic condition was: 0.75 mmol inorganic additive CuCl2,0.375 mmol organic additive benzoquinone(BQ),2.5 g surface active agent tetrabutyl ammonium bromide,30 mL dichloromethane as solvent and DPPF as catalyst.A high TON(69.5 DPC mol/Pd mol) was obtained under a total pressure of 5 MPa(Pco∶Po2=93∶7) at 100 ℃ for 3 h.