Noble metal-free nickel catalyst formulations for hydrogen generation
View Patent ↗The invention relates to methods of using noble metal-free nickel catalysts to generate a hydrogen-rich gas from gas mixtures containing carbon monoxide and water, such as water-containing syngas mixtures, where the nickel may exist in either a supported or a bulk state. The noble metal-free water gas shift catalyst of the invention comprises Ni in either a supported or a bulk state and at least one of Ge, Cd, In, Sn, Sb, Te, Pb, their oxides and mixtures thereof. The invention is also directed toward noble metal-free nickel catalysts that exhibit both high activity and selectivity to hydrogen generation and carbon monoxide oxidation.
1. A method for producing a hydrogen-rich gas which comprises:
contacting a CO-containing gas with a noble metal-free water gas shift catalyst in the presence of water at a temperature of not more than about 450° C.,
wherein the water gas shift catalyst consists essentially of:
a) Ni and
b) at least one member selected from the group consisting of Cd, In, Sb, their oxides and mixtures thereof.
2. A method according to claim 1 , wherein the water gas shift catalyst further consists essentially of at least one member selected from the group consisting of Cr, Mn, Cu, their oxides and mixtures thereof.
3. A method according to claim 1 , wherein the CO-containing gas is a syngas.
4. A method according to claim 1 , wherein the water gas shift catalyst consists essentially of:
a) unsupported bulk Ni, and
b) at least one member selected from the group consisting of Cd, Sb, their oxides and mixtures thereof.
5. A method according to claim 1 , wherein the water gas shift catalyst consists essentially of:
a) unsupported bulk Ni,
b) In, its oxides or mixtures thereof; and
c) Cd, its oxides or mixtures thereof.
6. A method according to claim 1 , wherein the water gas shift catalyst consists essentially of:
a) unsupported bulk Ni,
b) Sn, its oxides or mixtures thereof; and
c) Cd, its oxides or mixtures thereof.
7. A method according to claim 1 , wherein the water gas shift catalyst consists essentially of:
a) unsupported bulk Ni,
b) In, its oxides or mixtures thereof; and
c) Sb, its oxides or mixtures thereof.
8. A method according to claim 1 , wherein the water gas shift catalyst consists essentially of:
a) unsupported bulk Ni,
b) Sn, its oxides or mixtures thereof; and
c) Sb, its oxides or mixtures thereof.
9. A method according to claim 1 , wherein the Ni is supported on a carrier.
10. A method according to claim 2 , wherein the Ni is supported on a carrier.
11. A method according to claim 9 , wherein the water gas shift catalyst consists essentially of:
a) Ni
b) at least one member selected from the group consisting of In, its oxides and mixtures thereof, and
c) at least one member selected from the group consisting of Sn, Te, their oxides and mixtures thereof.
12. A method according to any one of claims 9 , 10 and 11 wherein the water gas shift catalyst is supported on a carrier comprising at least one member selected from the group consisting of alumina, zirconia, titania, ceria, magnesia, lanthania, niobia, zeolite, perovskite, silica clay, yttria, cobalt oxide, iron oxide, and mixtures thereof.
13. A method according to claim 12 , wherein the carrier comprises zirconia.
14. A method according to claim 12 , wherein the carrier comprises cobalt oxide.
15. A method according claim 1 , wherein the carbon monoxide containing gas is contacted with the water gas shift catalyst at a pressure of no more than about 50 bar.
16. A method according to claim 15 , wherein the carbon monoxide containing gas is contacted with the water gas shift catalyst at a pressure of no more than about 1 bar.
17. A method according to claim 1 , wherein the water gas shift catalyst comprises between about 0.05 wt. % to about 99 wt. %, with respect to the total weight of all catalyst components plus the support material, of Ni present in the water gas shift catalyst.
18. A method according to claim 15 , wherein the water gas shift catalyst comprises between about 0.50 wt. % to about 99 wt. %, with respect to the total weight of all catalyst components plus the support material, of Ni present in the water gas shift catalyst.
19. A method for producing a hydrogen-rich gas which comprises:
contacting a CO-containing gas with a noble metal-free water gas shift catalyst in the presence of water at a temperature of not more than about 450° C.,
wherein the water gas shift catalyst consists essentially of:
a) Ni and
b) at least one member selected from the group consisting of Cd, In, Sb, their oxides and mixtures thereof, and
wherein Ni is in a unsupported bulk state.
20. A method according to claim 19 , wherein the water gas shift catalyst consists essentially of:
a) unsupported bulk Ni, and
b) at least one member selected from the group consisting of Cd, Sb, their oxides and mixtures thereof.
21. A method according to claim 19 , wherein the water gas shift catalyst consists essentially of:
a) unsupported bulk Ni,
b) In, its oxides or mixtures thereof; and
c) Cd, its oxides or mixtures thereof.
22. A method according to claim 19 , wherein the water gas shift catalyst consists essentially of:
a) unsupported bulk Ni,
b) Sn, its oxides or mixtures thereof; and
c) Cd, its oxides or mixtures thereof.
23. A method according to claim 19 , wherein the water gas shift catalyst consists essentially of:
a) unsupported bulk Ni,
b) In, its oxides or mixtures thereof; and
c) Sb, its oxides or mixtures thereof.
24. A method according to claim 19 , wherein the water gas shift catalyst consists essentially of:
a) unsupported bulk Ni,
b) Sn, its oxides or mixtures thereof; and
c) Sb, its oxides or mixtures thereof.
25. A method according claim 19 , wherein the carbon monoxide containing gas is contacted with the water gas shift catalyst at a pressure of no more than about 50 bar.
26. A method according to claim 25 , wherein the carbon monoxide containing gas is contacted with the water gas shift catalyst at a pressure of no more than about 1 bar.
27. A method according to claim 19 , wherein the CO-containing gas is a syngas.