Comparation of Cu-Co-Mn Mixed Oxides and Hopcalite as Support in Synthesis of Diphenyl Carbonate by Oxidative Carbonylation of Phenol

Abstract

The difference of Cu-Co-Mn mixed oxides and hopcalite as support in synthesis of diphenyl carbonate by oxidative carbonylation of phenol was studied. The catalysts were characterized by transmission electron microscopy, scanning electron microscopy, X-ray power diffraction, and X-ray photoelectron spectroscopy. The results show that the average particle diameter of the former catalyst is about 40 nm, whereas the other catalyst is about 0.5 μm. The main crystal phase in the former catalyst is Co2MnO4 and Pd0.5Pd3O4, which in the latter catalyst is CuMn2O4, CoMn2O4 and Pd0.5Pd3O4.The oxygen atoms lose electrons and form oxygen vacancies in.Pd0.5Pd3O4 and Co2MnO4 of the former catalyst, which destroys the crystal integrity and prompts the oxygen adsorption on the crystal surface. The oxygen atoms lose electrons and form oxygen vacancies in.Pd0.5Pd3O4 of the latter catalyst. Finally, it was found that the difference of the yield and selectivity of the both catalysts was not remarkable.