| 摘要 |
The stability of HVI-PAO olefin oligomers is improved by reaction of the oligomer over an acidic function catalyst which introduces aromatic groups into the oligomer by cracking a portion of the oligomer to form cracking fragments which are then aromatized to aromatics which are subsequently alkylated by the oligomer. This reaction incorporates an aromatic function into the oligomer to produce a modified oligomer product of improved stability. The olefinic oligomers are prepared from 1-alkene by oligomerization in contact with a reduced metal oxide, preferably reduced chromium oxide, catalyst on support such as silica. The products retain the unique features of the olefin oligomer and exhibit high viscosity index and low pour point as well as improved thermal and oxidative stability and additive solvency characteristics resulting from the introduction of aromatic moieties into the structure of the oligomer by the intramolecular dehydrocyclization reaction.
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