Process for the preparation of aromatic hydrocarbons using crystalline silicates as catalyst

Claim 1

A process for the preparation of an aromatic hydrocarbon mixture which comprises contacting at an elevated temperature and reaction conditions an H 2 /CO mixture having an H 2 /CO molar ratio below 1.0, with a mixture of two catalysts of which one has the capability of catalyzing the conversion of an H 2 /CO mixture into acyclic oxygen-containing hydrocarbons and the other is a crystalline iron silicate having the following properties: (a) thermally stable up to a temperature above 600° C., (b) an X-ray powder diffraction pattern having, inter alia, the reflections given in Table A of the specification, (c) the composition of the silicate, expressed in moles of the oxides, includes oxides of hydrogen, alkali metal and silicon, and iron and has an Fe 2 O 3 /SiO 2 molar ratio (m) less than 0.1, said crystalline iron silicate having been prepared by a process comprising maintaining at an elevated temperature an aqueous mixture containing: at least one compound of an alkali metal (M), at least one quaternary alkylammonium compound (R 4 NX), at least one silicon compound and at least one iron compound, in which mixture the compounds are present in the following ratios, expressed in moles of the oxides: M 2 O: (R 4 N) 2 O=0.4-1.0, [M 2 O+(R 4 N) 2 O]:SiO 2 =0.24-0.40, SiO 2 :Fe 2 O 3 >10, and H 2 O:SiO 2 =5-50, until the crystalline silicate has formed, and separating the silicate from the mother liquor; and separating an aromatic hydrocarbon mixture from the reaction product.