Process for producing methane
The present disclosure relates generally to processes for the production of methane from hydrogen and carbon dioxide. In particular, the disclosure provides for a process for providing a product composition comprising methane. The process includes contacting a gaseous mixture comprising hydrogen and carbon dioxide with a supported methane synthesis catalyst, the supported methane synthesis catalyst comprising cobalt in the range of 1 wt % to 35 wt % on an elemental basis, to provide the product composition with a methane selectivity of at least 75%.
1 . A process for providing a product composition comprising methane, the process comprising:
contacting a gaseous mixture comprising hydrogen and carbon dioxide with a supported methane synthesis catalyst, the supported methane synthesis catalyst comprising cobalt in the range of 5 wt % to 20 wt % on an elemental basis, and manganese in the range of 0.5 wt % to 15 wt %, on an elemental basis, to provide the product composition with a methane selectivity of at least 75%.
2 . The process of claim 1 , wherein the gaseous mixture comprises no more than 5 wt % carbon monoxide.
3 . The process of claim 1 , wherein hydrogen and the carbon dioxide are present in a molar ratio in the range of from 1:1 to 4:1.
4 . The process of claim 1 , wherein at least 50 vol % of the gaseous mixture is hydrogen, carbon dioxide and nitrogen.
5 . The process of claim 1 , wherein the supported methane synthesis catalyst comprises cobalt in an amount in the range of 7-20 wt %, on an elemental basis.
6 . The process of claim 1 , wherein the supported methane synthesis catalyst comprises manganese, wherein the manganese is present in the range of 0.5-10 wt %, on an elemental basis.
7 . The process of claim 1 , wherein the supported methane synthesis catalyst comprises a support material comprising at least one of alumina, zirconia, titania, silica, zinc oxide, ceria, or combinations thereof.
8 . The process of claim 1 , wherein the contacting is performed at a temperature in the range of 150° C. to 325° C.
9 . The process of claim 1 , wherein the selectivity for methane is at least 80%.
10 . The process of claim 1 , wherein the carbon dioxide is reacted with a C 5+ selectivity of no more than 10%.
11 . The process of claim 1 , wherein the product composition is provided with a carbon dioxide conversion of at least 5%.
12 . The process of claim 1 , wherein the hydrogen comprises green hydrogen, and/or wherein the carbon dioxide comprises captured carbon dioxide or carbon dioxide from biomass gasification.
13 . A method of producing a synthesis gas composition comprising carbon monoxide and hydrogen, the method comprising:
performing the process of claim 1 to provide methane, and
reforming a reforming feed comprising at least a portion of the methane with water and/or oxygen to produce a reforming product stream comprising carbon monoxide and hydrogen.
14 . A Fischer-Tropsch process comprising
performing the process of claim 13 to provide carbon monoxide and hydrogen; and
contacting a hydrocarbon synthesis mixture comprising at least a portion of the carbon monoxide and at least a portion of the hydrogen with a Fischer-Tropsch hydrocarbon synthesis catalyst to produce a hydrocarbon composition with a selectivity for C 5+ hydrocarbons of at least 50% and/or a selectivity for oxygenates of at least 20%.
15 . The process of claim 14 , wherein the supported methane synthesis catalyst comprises a support material comprising at least one of zirconia, titania, silica, zinc oxide, ceria, or combinations thereof.
16 . The process of claim 15 , wherein the supported methane synthesis catalyst is free of alumina.
17 . The process of claim 14 , wherein the supported methane synthesis catalyst is supported on a titania support material, a zirconia support material, a zinc oxide support material, or a ceria support material.
18 . The process of claim 17 , wherein the supported methane synthesis catalyst is free of alumina.
19 . The process of claim 14 , wherein the supported methane synthesis catalyst is supported on a zirconia support material, a zinc oxide support material, or a ceria support material.
20 . The process of claim 14 , wherein the supported methane synthesis catalyst is supported on a titania support material.