How oligomerizing olefins to high linear oligomers and catalyst therefor

(57) Abstract: as active ingredient, by subtracting the loss on ignition due to the heat treatment at 900 ° C., 10 to 70 wt% nickel oxide (calculated as NiO), titanium dioxide or zirconium dioxide 5 to 30 wt%, aluminum oxide 0 20 wt%, the catalyst is containing 20 to 40 wt% of silicon dioxide and alkali metal oxides from 0.01 to 1% by weight, with the proviso that the sum of the content of the individual components in the catalyst is 100 wt% by using a using a fixed bed catalyst, at elevated pressure, at room temperature or elevated temperature, C