Method for adsorbing and storing hydrogen at cryogenic temperatures
AssigneeAir Products and Chemicals, Inc.
InventorsGuido P. Pez, William A. Steyert
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Abstract
Hydrogen is stored at cryogenic temperatures by adsorption on porous carbon having a nitrogen BET apparent surface area above about 1500 m.sup.2 /g. Hydrogen can be adsorbed and desorbed in the context of a cryopump, having as the pumping element a panel, having large particles of pressed porous carbon thereon.
Claims23
In a high vacuum pump comprising a cryoadsorption pumping element and means for cooling the pumping element to the cryogenic temperature range, the improvement wherein the pumping element comprises porous carbon particles having a nitrogen BET apparent surface area above about 1500 m.sup.2 /g and dimensions greater than about 1.5.times.1.5.times.1.5 mm.
A panel assembly for a cryoadsorption pump, comprising a high thermal conductivity metal panel adapted for cooling by a cryogenic fluid, the metal panel having mounted thereon porous carbon particles having a nitrogen BET apparent surface area above 1500 m.sup.2 /g and dimensions greater than 1.5.times.1.5.times.1.5 mm.
A method for maintaining high initial hydrogen pumping speed, characteristic of adsorbent carbon particles of 1-1.5 mm or smaller, in a high vacuum pump comprising a cryoadsorption pumping element and means for cooling the pumping element to the cryogenic temperature range, comprising using as pumping element porous carbon particles having a nitrogen BET apparent surface area above 1500 m.sup.2 /g and dimensions above about 1.5.times.1.5.times.1.5 mm.
Dependencies are inferred from the claim text.