OLIGOMERISATION OF OLEFINS FOR THE PRODUCTION OF SYNTHETIC FUEL

The invention relates to a synthetic hydrocarbon fuel composition, and a process for making such a fuel composition, in which the fuel composition has the following properties: a) a boiling point distribution having (i) a 10% recovery of 205° C. or less and (ii) an end point of 300° C. or less; b) a freezing point of −47° C. or less; and c) a density at 15° C. of at least 775 kg/m3. A process for producing the fuel composition comprises the oligomerisation of olefins over an oligomerisation catalyst. In addition the invention relates to a process for producing hydrocarbons comprising contacting one or more olefins with an oligomerisation catalyst in a reaction zone under conditions sufficient to cause oligomerisation of olefins, and removing an outlet stream comprising products of olefin oligomerisation from the reaction zone, wherein the oligomerisation catalyst comprises a crystalline zeolite Brønsted acid catalyst, whose crystals comprise an inorganic oxide framework with an internal pore structure, and an external surface, in which the ratio of the number of Brønsted acid sites on the external surface compared to the internal pore structure is in the range of from 0.1 to 20% and/or the ratio of the surface area of the internal pore structure compared to the external crystal surface area is in the range of from 5 to 1000.