▎ 摘　　要

NOVELTY - A spherical graphene/magnesium halide supported catalyst comprises spherical graphene oxide, magnesium, halogen and titanium compound. The spherical graphene/magnesium halide supported catalyst is prepared by mixing solution of graphene oxide and liquid nitrogen, atomizing and curing mixture, drying cured product to obtain spherical oxide graphene, mixing graphene with alkyl magnesium halide and reacting mixture to obtain precursor, washing precursor and drying to obtain carrier, mixing carrier with titanium compound, filtering and drying mixture. USE - Spherical graphene/magnesium halide supported catalyst is used for in-situ polymerization for preparing polyethylene material. DETAILED DESCRIPTION - A spherical graphene/magnesium halide supported catalyst comprises 5-20 %mass spherical graphene oxide, 10-25 %mass magnesium, 35-55 %mass halogen and 5-20 %mass titanium compound. The spherical graphene/magnesium halide supported catalyst is prepared by dispersing graphene oxide in water and ultrasonically processing mixture to form homogeneous solution, quickly mixing homogeneous solution and liquid nitrogen, atomizing and curing mixture, drying cured product by vacuum to obtain spherical oxide graphene, mixing spherical oxidized graphene with alkyl magnesium halide in organic solvent, and reacting mixture at 50-80 degrees C for 12-48 hours to obtain composite carrier precursor, washing carrier precursor with water and vacuum drying for 0.5-2 hour to obtain oxidized graphene/magnesium halide carrier, mixing oxidized graphene/magnesium halide carrier with titanium compound at 100-120 degrees C, filtering mixture and vacuum drying mixture. The titanium compound is of formula: TiXn(OR)4-n (I). The molar ratio of spherical oxidized graphene and alkyl magnesium halide is 0.5-1.2. R=1-20C hydrocarbyl; X=halo;and n=0-4.