Hydrogen getter
A getter composition suitable for gettering hydrogen comprises a first metal oxide and a second metal oxide, said first metal oxide being more readily reducible in hydrogen at temperatures between 0° C. and 100° C. than said second metal oxide.
1. A hydrogen getter composition, comprising a mixture of the following particulate components:
i) a hydrogen-getter, comprising:
a) a first metal oxide, comprising an oxide of a metal selected from the group consisting of platinum, palladium, rhodium, and ruthenium;
b) 95 to 99.9 wt % of a second metal oxide, relative to the total metal oxide components of the composition, comprising an oxide of a metal selected from the group consisting of copper, iron, nickel, cobalt, and cerium; and
ii) 5-75 wt. % of a moisture absorbing material, relative to the total weight of the composition;
wherein 0.01% to 5 wt. % of the first metal oxide is present, calculated as the metal and based upon the total weight of the first and second metal oxides.
2. The composition of claim 1 , wherein the first metal oxide is precipitated onto the second metal oxide.
3. The composition of claim 1 , wherein the first metal oxide is coprecipitated with the second metal oxide.
4. The composition of claim 1 , wherein the first metal oxide is impregnated onto the second metal oxide.
5. The composition of claim 1 , wherein the first metal oxide is supported on the second metal oxide.
6. The composition of claim 1 , wherein the moisture absorbing material comprises a zeolite.
7. The composition of claim 6 , wherein the zeolite is selected from the group consisting of FAU zeolites and LTA zeolites.
8. The composition of claim 1 , wherein the composition is in the form of a shaped pellet or tablet.
9. The composition of claim 8 , wherein the pellet or tablet has a minimum dimension of 1.5 mm or less.
10. The composition of claim 1 , wherein the composition is in a mouldable or printable form.
11. The composition of claim 10 , further comprising an organic binder and a solvent for the binder, said binder being permeable to hydrogen.
12. The composition of claim 11 , wherein the binder comprises a cellulose derivative.
13. The composition of claim 11 , wherein the binder comprises a polymeric binder.
14. The composition of claim 1 , from which a support comprising a third metal oxide or carbon is absent.
15. The composition of claim 1 , consisting essentially of:
i) the first metal oxide;
ii) the second metal oxide;
iii) the moisture absorbing material;
iv) 0-25 wt. % of a binder, relative to the total weight of the composition; and
v) optionally, materials selected from a colorant and a lubricant;
wherein the first metal oxide is more readily reducible in hydrogen at temperatures between 0° C. and 100° C. than the second metal oxide.
16. An electronic device incorporating the composition of claim 15 .
17. An electronic device incorporating the composition of claim 1 .
18. A hydrogen getter composition, comprising:
i) a first metal oxide, comprising an oxide of a metal selected from the group consisting of platinum, palladium, rhodium, and ruthenium;
ii) 95 to 99.9 wt. % of a second metal oxide, relative to the total metal oxide components of the composition, comprising an oxide of a metal selected from the group consisting of copper, iron, nickel, cobalt, and cerium; and
iii) a moisture absorbing material;
wherein:
a) the first metal oxide is supported on the second metal oxide; and
b) 0.01% to 5 wt. % of the first metal oxide is present, calculated as the metal and based upon the total weight of the first and second metal oxides.
19. The composition of claim 18 , wherein the first metal oxide is precipitated onto the second metal oxide.
20. The composition of claim 18 , wherein the first metal oxide is impregnated onto the second metal oxide.
21. The composition of claim 18 , wherein the moisture absorbing material is present in an amount of 5-75 wt. %, relative to the total weight of the composition.
22. The composition of claim 21 , wherein the moisture absorbing material comprises a zeolite.
23. The composition of claim 22 , wherein the zeolite is selected from the group consisting of FAU zeolites and LTA zeolites.
24. The composition of claim 18 , wherein the composition is in the form of a shaped pellet or tablet.
25. The composition of claim 24 , wherein the pellet or tablet has a minimum dimension of 1.5 mm or less.
26. The composition of claim 18 , wherein the composition is in a mouldable or printable form.
27. The composition of claim 26 , further comprising an organic binder and a solvent for the binder, said binder being permeable to hydrogen.
28. The composition of claim 27 , wherein the binder comprises a cellulose derivative.
29. The composition of claim 28 , wherein the binder comprises a polymeric binder.
30. The composition of claim 18 , from which a support comprising a third metal oxide or carbon is absent.
31. The composition of claim 18 , consisting essentially of:
i) the first metal oxide;
ii) the second metal oxide;
iii) the moisture absorbing material;
iv) 0-25 wt. % of a binder, relative to the total weight of the composition; and
v) optionally, materials selected from a colorant and a lubricant;
wherein the first metal oxide is more readily reducible in hydrogen at temperatures between 0° C. and 100° C. than the second metal oxide.
32. An electronic device incorporating the composition of claim 31 .
33. An electronic device incorporating the composition of claim 18 .