Alkali-containing catalyst formulations for low and medium temperature hydrogen generation
View Patent ↗The invention is directed toward methods of using alkali-containing catalysts for generation of hydrogen-rich gas at temperatures of less than about 260° C. A WGS catalyst of the invention may have the following composition: a) at least one of Pt, Ru, their oxides and mixtures thereof; b) Na, its oxides or mixtures thereof; and optionally, c) Li, its oxides and mixtures thereof. The catalysts may be supported on a variety of catalyst support materials. The invention is also directed toward 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 carbon monoxide containing gas with a water gas shift catalyst in the presence of water at a temperature of less than about 260° C.,
wherein the water gas shift catalyst consists essentially of:
a) Pt, its oxides or mixtures thereof; and
b) Na, its oxides or mixtures thereof.
2. method according to claim 1 , wherein the carbon monoxide containing gas is a syngas.
3. method according to claim 1 , 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, yttria and iron oxide, and mixtures thereof.
4. A method according to claim 3 , wherein the alumina is doped with Zr.
5. A method according to claim 3 , wherein the carrier comprises zirconia.
6. A method according to 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.
7. A method according to claim 6 , wherein the carbon monoxide containing gas is contacted with the water gas shift catalyst at a pressure of no more than about 15 bar.
8. A method according to claim 6 , wherein the carbon monoxide containing gas is contacted with the water gas shift catalyst at a pressure of no more than about 1 bar.
9. A method according to claim 1 , wherein the water gas shift catalyst comprises about 0.05 wt. % to about 10 wt. %, with respect to the total weight of all catalyst components plus the support material, of Pt present in the water gas shift catalyst.
10. A method according to claim 9 , wherein the water gas shift catalyst comprises about 0.50 wt. % to about 6 wt. %, of Pt present in the water gas shift catalyst.
11. A method for producing a hydrogen-rich gas which comprises:
contacting a carbon monoxide containing gas with a water gas shift catalyst in the presence of water at a temperature of less than about 260° C.,
wherein the water gas shift catalyst consists essentially of:
a) Pt, its oxides or mixtures thereof;
b) Na, its oxides or mixtures thereof; and
c) Li, its oxides or mixtures thereof.
12. A method according to claim 11 , wherein the carbon monoxide containing gas is a syngas.
13. A method according to claim 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, yttria and iron oxide, and mixtures thereof.
14. A method according to claim 13 , wherein the alumina is doped with Zr.
15. A method according to claim 13 , wherein the carrier comprises zirconia.
16. A method according to claim 11 , wherein the carbon monoxide containing gas is contacted with the water gas shift catalyst at a pressure of no more than about 50 bar.
17. A method according to claim 16 , wherein the carbon monoxide containing gas is contacted with the water gas shift catalyst at a pressure of no more than about 15 bar.
18. A method according to claim 16 , wherein the carbon monoxide containing gas is contacted with the water gas shift catalyst at a pressure of no more than about 1 bar.
19. A method according to claim 11 , wherein the water gas shift catalyst comprises about 0.05 wt. % to about 10 wt. %, with respect to the total weight of all catalyst components plus the support material, of Pt present in the water gas shift catalyst.
20. A method according to claim 19 , wherein the water gas shift catalyst comprises about 0.50 wt. % to about 6 wt. %, of Pt present in the water gas shift catalyst.