Sorption Pumping of Hydrogen by Carbon Dioxide Cryodeposits

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Abstract
A systematic experimental investigation of the cryosorption of H2 by cold cryodeposited-CO2 frost is reported. It is shown that the sorption capacity of the frost depends upon the conditions at which the frost was formed and its temperature history. Frosts formed in a manner to make them porous or disordered are shown to possess greater sorption capacities. It appears that surface diffusion of absorbed molecules into a disordered frost structure is the basic pumping mechanism. Isotherms for H2 sorbed by CO2 frosts formed over a wide range of conditions are presented. Also, the reuse sorption capacity of the frost is well documented. As a result of the present tests, it is now possible to put the process of frost-cryosorption pumping into better perspective.

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