Patent ID: 8901364

Claim:
A process for producing a hydrocarbon fraction containing components boiling in the range typical for diesel fuel comprising contacting a feedstock comprising one or more C 2 to C 10 alkenes with a modified zeolite catalyst having a one-dimensional micropore structure consisting of channels made from rings containing between 8 and 12 silicon and/or aluminum atoms at a temperature in the range 100 to 500° C. and pressure in the range 0.1 to 200 bar characterised in that the modified zeolite catalyst is one which has been prepared by treating a corresponding zeolite precursor with an alkaline solution under conditions which will remove silicon from the structure and the corresponding zeolite is a TON zeolite; and producing diesel fuel from the hydrocarbon fraction; wherein the alkaline solution is an aqueous hydroxide solution selected from the group consisting of sodium hydroxide, potassium hydroxide, ammonium hydroxide, magnesium hydroxide, calcium hydroxide and tetramethyl-, tetraethyl-, tetrapropyl- and tetrabutylammonium hydroxide, and wherein the conversion of the feedstock to diesel fuel is greater than the conversion of the feedstock to diesel fuel with the TON zeolite that is not treated with an alkaline solution and conducted at the same temperature and pressure.