Striking different behavior in the activation of α-olefins by homogeneous and heterogenized catalysts based on η5-cyclopentadienyl nickel derivatives
✍ Scribed by A.M. Raspolli Galletti; G. Geri; G. Sbrana; M. Marchionna; P. Ferrarini
- Book ID
- 103997710
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 622 KB
- Volume
- 111
- Category
- Article
- ISSN
- 1381-1169
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✦ Synopsis
Homogeneous
-q5-cyclopentadienyl nickel catalysts have been applied to ethylene oligomerization. Their activity, enhanced by the presence of Al(OEt)Et, as co-catalyst, resulted the highest up to now reported for this type of complexes. The same catalytic systems were also able to oligomerize propylene as well as ethylene/propylene mixtures. In particular propylene was converted into branched dimers, mostly 2,3_dimethylbutenes. Heterogenization of the above system, carried out by anchoring the nickel derivative to a styrene/divinylbenzene resin properly functionalized with the cyclopentadienyl group, caused a drastic change of the selectivity of the process, ethylene polymerization to HDPE taking place instead of oligomerization.