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Citation: Liu Dongbing, Song Huanling, Li Dagang. Catalytic Oligomerization of Ethylene to Lower α-Olefins by Nickel Chelate[J]. Chinese Journal of Applied Chemistry, ;1997, 14(3): 99-101. shu

Catalytic Oligomerization of Ethylene to Lower α-Olefins by Nickel Chelate

1.
Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000

Received Date: 17 October 1996
Available Online: 10 March 1997

The oligomerization of ethylene catalyzed by P-O ligands, diphenylphosphi nobenzoic acid(DPP) and diphenylphosphinoacetic sodium(DPE), has been investigated. In catalytic system DPP/NiCl₂·6H₂O/NaBH₄ the content of lower olefins (C₄⁼~C₈⁼) increases with increase of DPP/Ni molar ratio and the content of higher olefins decreases markedly. Phosphines P(CH₃)₂Ph, P(OPh)₃, P(C₄H₉)₃, PClPh₂ and PPh₃ added in the catalytic system DPE/NiCl₂·6H₂O/NaBH₄ increase the content of C₄⁼ up ot 77.96%~95.29% from 49.45%(without their addition). Among these phosphines only P(C₄H₉)₃ could increase the selectivity to linear T-olefin. The reaction conditions have been investigated.
- ethylene,
- catalytic oligomerization,
- T-olefin,
- nickel chelate
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