Preparation of hydrocarbon mixtures from syngas

Claim 1

A process for the preparation of a hydrocarbon mixture from a mixture of carbon monoxide and hydrogen, characterized in that for the preparation of a hydrocarbon mixture whose C 5 + fraction has a high content of branched C 5 and C 6 paraffins, a H 2 /CO mixture having a H 2 /CO molar ratio between 1.0 and 5.0 is contacted with a catalyst mixture which has been prepared by dispersing a crystalline metal silicate which after one hour's calcination in air at 500° C. has the following properties: (a) an X-ray powder diffraction pattern in which the strongest lines are the four lines given in Table A Table A d(Å) 11.1±0.2 10.0±0.2 3.84±0.07 3.72±0.06; and (b) in which, in addition to SiO 2 , one or more oxides of a trivalent metal A chosen from aluminum, iron, gallium, rhodium, chromium and scandium occur, the SiO 2 /A 2 O 3 molar ratio is higher than 10; in water together with one or more precipitates which contain zinc and one or more metals chosen from chromium, copper and aluminum and which precipitates have been obtained by adding a basic reacting substance to one or more aqueous solutions of salts of the metals concerned, spray-drying the dispersion thus obtained and calcining the spray-dried material at a temperature between 425° and 525° C.