The present invention relates to a catalyst composition for
ethylene oligomerization and the use thereof. Such catalyst composition includes
chromium compound, ligand containing P and N, activator and accelerator; wherein the
chromium compound is selected from the group consisting of acetyl
acetone chromium, THF-chromium
chloride and / or Cr(2-ethylhecanoate)3; general formula of the ligand containing P and N is shown as: in which R1, R2, R3 and R4 are phenyl, benzyl, or naphthyl. R5 is
isopropyl, butyl, cyclopropyl, cyclopentyl, cyclohexyl or fluorenyl; the activatior is methyl
aluminoxane, ethyl
aluminoxane, propyl
aluminoxane and / or butyl aluminoxane; general formula of the accelerator is X1R6X2, in which X1 and X2 are F, Cl, Br, I or alkoxyl, R6 is
alkyl or
aryl; the
molar ratio of a, b, c and d is 1:0.5˜10:50˜3000:0.5˜10. After mixing the four components mentioned previously under
nitrogen atmosphere for 10 minutes, they are incorporated to the reactor, or these four components are incorporated directly into the reactor. Then
ethylene is introduced for oligomerization. Such catalyst can be used in producing 1-
octene through
ethylene oligomerization. It is advantageous in high catalysing activity, high 1-
octene selectivity, etc. The catalytic activity is more than 1.0×106 g product·mol−1 Cr ·h−1, the fraction of C8 linear α-olefin is more than 70% by
mass.