# US 5,703,378 A · Materials for the scavanging of hydrogen at high temperatures

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- Number: US 5,703,378 A
- Document ID: US5703378A
- Status: Granted
- Kind: A
- Application number: 08/647,093
- Filed: 1996-05-09
- Granted: 1997-12-30
- Earliest claimed: 1995-04-18
- Assignees: Sandia Corporation
- Inventors: Timothy J. Shepodd; Bradley L. Phillip
- Web page: https://patentgrep.com/patent/US5703378A

## CPC

- C01B 3/00: Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen; Reversible storage of hydrogen (production of water-gas or synthesis gas from solid carbonaceous material C10J)
- C01B 3/0015: Organic compounds, e.g. liquid organic hydrogen carriers [LOHC] or metalorganic compounds; Solutions thereof
- H01J 7/183: {Composition or manufacture of getters}
- H01J 61/26: Means for absorbing or adsorbing gas, e.g. by gettering; Means for preventing blackening of the envelope
- Y02E 60/32: Hydrogen storage
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A hydrogen getter composition comprising a double or triple bonded hydrocarbon with a high melting point useful for removing hydrogen gas, to partial pressures below 0.01 torr, from enclosed spaces and particularly from vessels used for transporting or containing fluids at elevated temperatures. The hydrogen getter compositions disclosed herein and their reaction products will neither melt nor char at temperatures in excess of 100.degree. C. They possess significant advantages over conventional hydrogen getters, namely low risk of fire or explosion, no requirement for high temperature activation or operation, the ability to absorb hydrogen even in the presence of contaminants such as water, water vapor, common atmospheric gases and oil mists and are designed to be disposed within the confines of the apparatus. These getter materials can be mixed with binders, such as fluropolymers, which permit the getter material to be fabricated into useful shapes and/or impart desirable properties such as water repellency or impermeability to various gases.

## Claims

### Claim 1

A system for removing hydrogen from an enclosed volume comprising:
a) an enclosed volume;
b) a hydrogen getter within the volume, said hydrogen getter comprising an organic compound wherein said organic compound has the formula R.sub.x .tbd.R'.sub.y, wherein x and y may be identical and are at least equal one and R and R' may be identical and are benzene, styrene, naphthalene, anthracene, biphenyl, fluorene, phenanthrene, pyrene, or alkyl substituted derivatives or polymers thereof; and
c) a catalyst, combined with the getter, for catalyzing the reaction between said organic compound and hydrogen.

### Claim 2 (depends on 1)

The system of claim 1 wherein said enclosed volume is an apparatus for transporting fluids comprising:
an inner tubular having an outer surface and defining an inner space adapted for carrying fluids; and
an outer tubular disposed around said inner tubular and defining an annular space therein.

### Claim 3 (depends on 1)

The system of claim 1 wherein said enclosed volume comprises a heat pipe.

### Claim 4 (depends on 1)

The system of claim 1 wherein said enclosed volume comprises a lamp.

### Claim 5 (depends on 1)

The system of claim 1 wherein said organic compound is 2-(phenylethynyl)fluorene; 2,7-bis(phenylethynyl)fluorenone; 2,7-bis(phenylethynyl)fluorene; 2,4,7-tris(phenylethynyl)fluorene; 2,4,5,7-tetrakis(phenylethynyl)fluorene; 2,3,5,6-tetrakis(phenylethynyl)-p-xylene; 1,2,4,5-tetrakis(phenylethynyl)benzene or 4,4-bis(phenylethynyl)biphenyl and combinations thereof.

### Claim 6 (depends on 1)

The system of claim 1 wherein said organic compound is 4-(9-phenanthrenenylethynyl) pyrene; trans-1,2-bis(9-anthracenyl)ethene; or phenylethynyl substituted polystyrene and combinations thereof.

### Claim 7 (depends on 1)

The system of claim 1 wherein said hydrogenation catalyst is platinum, rhodium or palladium and combinations thereof.

### Claim 8 (depends on 7)

The system of claim 7 wherein said catalyst is supported on a porous, inert solid.

### Claim 9 (depends on 8)

The system of claim 8 wherein said porous, inert solid is activated carbon, aluminum oxide or barium carbonate and combinations thereof.

### Claim 10 (depends on 1)

The system of claim 1 wherein the concentration of hydrogenation catalyst is from about 0.1 to about 75 weight percent catalyst, wherein said catalyst contains about 1 to 5 weight percent of a metal, based on the weight of said catalyst.