Homogeneous rare earth catalyst and preparation method and use thereof

A homogeneous rare earth catalyst prepared in a dry inert atmosphere, wherein a preparation of the homogeneous rare earth catalyst comprises:

• adding an electron donor, alkyl aluminum, and a depolymerizing agent sequentially into a rare earth neodymium-based organic compound to conduct alkylation, and
• adding a chloride to conduct chlorination to obtain the homogeneous rare earth catalyst;
• wherein the rare earth neodymium-based organic compound, the electron donor, the alkyl aluminum, the depolymerizing agent, and the chloride are in a molar ratio of 1:(4-22):(8-42):(2-14):(0.8-4);
• the depolymerizing agent is one selected from the group consisting of an alkyl boron compound, a phosphate compound, and a nitrogen-containing compound without active hydrogen;
• and
• the alkyl boron compound is one selected from the group consisting of triethyl borane, triallylborane, and tri-n-butyl borane;
• the phosphate compound is one selected from the group consisting of triethyl phosphate, tributyl phosphate, and triphenyl phosphate;
• and the nitrogen-containing compound without active hydrogen is one selected from the group consisting of triethylamine, tri-n-butylamine, trioctylamine, pyridine, and 2,6-dibromopyridine.