Supported three-center catalyst and preparation method and application

A supported three-center catalyst, wherein:

• the three-centered catalyst comprises a porous inorganic carrier, an organic chromium active component, an inorganic chromium active component, an inorganic vanadium active component, and optionally, a catalyst modification component;
• the organic chromium active component is obtained after a precursor of the organic chromium active component is activated by an organometallic co-catalyst or a polymerization monomer, and the precursor of the organic chromium active component is obtained by loading an organic chromium source comprising at least one of a cyclopentadienyl ligand, an indenyl ligand, a fluorenyl ligand, a cyclopentadienyl derivative ligand, an indenyl derivative ligand, or a fluorenyl derivative ligand onto the surface of the porous inorganic carrier;
• the inorganic chromium active component is obtained by activating a precursor of the inorganic chromium active component by an organometallic co-catalyst or a polymerization monomer, and the precursor of the inorganic chromium active component is a high-temperature calcined product of a chromium source on the surface of the porous inorganic carrier;
• the inorganic vanadium active component is obtained after a precursor of the inorganic vanadium active component is activated by an organometallic co-catalyst or a polymerization monomer, and the precursor of the inorganic vanadium active component is a high-temperature calcined product of a vanadium source on the surface of the porous inorganic carrier;
• the catalyst modification component is a high-temperature calcined product of a compound comprising sulfur, phosphorus or halogen element on the surface of the porous inorganic carrier, wherein the compound comprising sulfur, phosphorus or halogen element is referred to as a component Q;
• the organometallic co-catalyst comprises at least one of an organoaluminum compound, an organolithium compound, or an organoboron compound, wherein the organoaluminum compound is at least one of trialkyl aluminum AlR3, dialkyl aluminum alkoxide AlR2OR, dialkyl aluminum halide AlR2X, aluminoxane, or ethyl sesquialuminum chloride, wherein R is an alkyl group, and wherein X is halogen;
• and
• the polymerization monomer is ethylene or α-olefins.