Catalytic Performance of Cu_2(OH)_3Cl Catalysts Supported on Various Supports for Methanol Oxidative Carbonylation

Supported Cu2(OH)3Cl catalysts were prepared by the slurry impregnantion method and used in MeOH oxidative carbonylation to dimethyl carbonate(DMC).The catalytic activity of Cu2(OH)3Cl supported on various supports was higher than that of supported CuCl2, and active carbon(AC) was the suitable support because of its larger specific surface area.Cu2(OH)3Cl/AC(w(Cu) = 18.71%) exhibited excellent catalytic performance.MeOH conversion, DMC selectivity, and DMC space time yield were 6.93%, 67.3%, and 139.13 mg/(g·h), respectively, and the catalyst was more stable.The supported catalysts were characterized by CO-temperature programmed desorption, X-ray dif-fraction, X-ray photoelectron spectroscopy, and scanning electron microscopy, showing that the higher dispersion of Cu2(OH)3Cl in Cu2(OH)3Cl/AC was getting worse and transformed to CuCl2 and CuO during the reaction, resulting in the decrease of catalytic activity.The unique CuⅡ species in the fresh catalyst transferred into CuI species partially during the reaction.