abstract |
The present invention relates to a process for oligomerization of ethylene, comprising subjecting a catalyst composition to a gas phase of ethylene and conducting an oligomerization, wherein the catalyst composition comprises (a) a chromium compound, (b) a metalated PNPNH ligand, and (c) an activator or cocatalyst, pref. Et3Al; the catalyst composition as such, as well as a metalated PNPNH ligand and a method to obtain it. |