| abstract |
A method of oligomerization of an olefinic compound to produce an oligomeric product is carried out in the presence of an active catalyst, a non-metallic oxygen containing additive, and optionally a zinc compound. The oligomerization catalyst is an active catalyst, which is provided in combination with a combination of a chromium source, a binding compound, and a catalyst activator or catalyst activator. The non-metallic oxygen containing additive is present in an amount such that the ratio of the molar amount of the non-metallic oxygen containing additive to the molar amount of chromium in the chromium source per Cr productivity of 10 6 g / g is in the range of 0.01 to 400. |