NiO–W2O3/Al2O3 catalysts for the production of ecological gasoline: Effect of both NiO and the preparation method on the isobutene oligomerization selectivity

The results obtained for the oligomerization of C4 olefins in order to produce high octane ecological gasoline by using NiO–W2O3/Al2O3 catalysts prepared by both the wetness impregnation and sol–gel methods, are reported. High selectivity towards C8=C8= olefins, avoiding the formation of heavier olefinic products, as well as an excellent stability were reached by means of the NiO–W2O3/Al2O3 impregnated catalyst. The characterization of the catalysts by XRD, total specific surface area and FTIR pyridine adsorption are also reported.