Modified silicalite catalysts and their preparation and process for the use thereof.

摘要

Catalysts comprising a silica molecular sieve modified by a metal which forms acidic oxides selected from the group consisting of Group VIB and VIIB elements and, a Fischer-Tropsch catalyst wherein the ratio of zeolite to Fischer-Tropsch component is from 0.1 to 10:1 can be employed to produce gasoline quality liquid hydrocarbons from synthesis gas. A process is employed which includes the step of contacting synthesis gas having a ratio of hydrogen to carbon oxides of from 0.1 to 10.0:1 over the foregoing catalyst at a reaction temperature of from 100 DEG C to 500 DEG C and at a pressure of from one atmosphere (0.1 MPa) to 200 atmospheres (20 MPa) and at a gas hourly space velocity of from 10 to 100,000. A method is also provided for the preparation of the combination catalyst. The liquid hydrocarbon product is highly aromatic, essentially free of external olefins and totally free of detectable oxygenates.