Process for conversion of synthesis gas to hydrocarbons using a zeolite-methanol catalyst system
AssigneeChevron U.S.A. Inc.
InventorsCharles L. Kibby, Allen W. Burton, JR., Alfred Hass, Simon Holz
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Abstract
A process is described for converting synthesis gas containing carbon monoxide and hydrogen to hydrocarbons via methanol as an intermediate, by contacting the synthesis gas with a catalyst system containing a mixture of gallium silicate zeolite catalyst and a methanol catalyst. The process results in reduced amounts of undesirable low carbon number hydrocarbons, e.g., C4 and lower, undesirable high carbon number hydrocarbons, e.g., C10 and higher, and aromatic hydrocarbons. The process provides higher yields of useful, high octane hydrocarbons boiling in the gasoline range.
Claims17
A process for converting synthesis gas feedstock comprising hydrogen and carbon monoxide at a molar ratio between about 1.5:1 and about 2.5:1 to predominately hydrocarbons boiling in the gasoline range, the process comprising:
- contacting the synthesis gas feedstock with a catalyst system comprising GaZSM-5 catalyst and a methanol catalyst at a temperature between about 330° C. and about 370° C. and a pressure between about 20 atm and about 100 atm for a time sufficient to produce hydrocarbons;
- wherein the hydrocarbons produced contain less than about 10% by volume aromatic hydrocarbons and at least about 75% by volume C5+ liquid hydrocarbons.
A catalyst system for converting synthesis gas comprising hydrogen and carbon monoxide to predominately gasoline boiling range hydrocarbons, the catalyst system comprising a mixture of acidic GaZSM-5 catalyst and a methanol catalyst comprising ZnO—Cr2O3 having a Zn:Cr atomic ratio of 1 and having a surface area of between about 100 m2/g and about 240 m2/g, wherein the weight ratio of ZnO—Cr2O3 catalyst to acidic GaZSM-5 catalyst is between about 10:90 and about 90:10.
Dependencies are inferred from the claim text.