Oxidation resistant organic hydrogen getters
View Patent ↗A composition for removing hydrogen from an atmosphere, comprising a mixture of a polyphenyl ether and a hydrogenation catalyst, preferably a precious metal catalyst, and most preferably Pt. This composition is stable in the presence of oxygen, will not polymerize or degrade upon exposure to temperatures in excess of 200° C., or prolonged exposure to temperatures in the range of 100-300° C. Moreover, these novel hydrogen getter materials can be used to efficiently removing hydrogen from mixtures of hydrogen/inert gas (e.g., He, Ar, N 2 ), hydrogen/ammonia atmospheres, such as may be encountered in heat exchangers, and hydrogen/carbon dioxide atmospheres. Water vapor and common atmospheric gases have no adverse effect on the ability of these getter materials to absorb hydrogen.
1. A composition for absorbing hydrogen comprising:
a mixture of a polyphenol ether having the general structure
wherein n is from 3-7 and
a precious metal hydrogenation catalyst.
2. The composition of claim 1 , wherein the hydrogenation catalyst is Pt.
3. The composition of claim 1 , wherein the hydrogenation catalyst is present at a concentration of from about 0.5 to 5 wt %.
4. The composition of claim 1 , wherein the hydrogenation catalyst is supported on a porous solid.
5. The composition of claim 4 , wherein the porous solid is activated carbon, aluminum oxide, or barium carbonate, or combinations thereof.
6. The composition of claim 1 , further including a binder or filler.
7. The composition of claim 6 , wherein the binder or filler is an inert polymer, a thixotropic agent, a mineral, a carbon powder, or finely divided silica.
8. The composition of claim 7 , wherein the binder or filler is present at a concentration of from about 20-70 wt %.
9. A composition for absorbing hydrogen from a gas mixture, comprising:
a mixture of a polyphenyl ether and a precious metal hydrogenation catalyst, wherein the polyphenyl ether has the general structure
wherein n is from 3-7.
10. The composition of claim 9 , wherein the gas mixture contains oxygen or water vapor or a mixture thereof.
11. The composition of claim 9 ,wherein the hydrogenation catalyst is Pt.
12. The composition of claim 11 ,wherein the hydrogenation catalyst is present at a concentration or from about 0.5 to 5 wt %.
13. The composition of claim 9 , wherein the hydrogenation catalyst is supported on a porous solid.
14. The composition of claim 13 , wherein the porous solid is activated carbon, aluminum oxide, or barium carbonate, or combinations thereof.
15. The composition of claim 9 , further including a binder or filler.
16. The composition of claim 15 , wherein the binder or filler is an inert polymer, a thixotropic agent, a mineral, a carbon powder, or finely divided silica.
17. The composition or claim 15 ,wherein the binder or filler is present at a concentration of from about 20-70 wt %.