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    Low Temperature Adsorption Versus Pore Size in Activated Carbons

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    Date
    2008-05
    Author
    Martins, D.
    Catarino, I.
    Lopes, D.
    Esteves, I.
    Mota, J. P.
    Bonfait, G.
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    Abstract
    Activated carbons have been used for a long time at low temperature for cryogenic applications. The physisorption properties depend on the pore geometry and size: this feature can be used to optimize the carbon structure for a specific application. In this work, we report on the lowtemperature adsorption properties of He, H2, and N2, using three activated carbons: a carbon monolith (sample A), a granular carbon (sample B) and a pelletized carbon (sample C) with different pore size distributions. Adsorption measurements were performed between 0.1 mbar and 1 bar and in the range 10 K to 100 K for He, 15 K to 300 K for H2, and 70 K to 300 K for N2. The isosteric heat of adsorption was obtained: it increases with decreasing pore diameter, as expected from the enhanced solid-fluid interaction potential in smaller pores. The characteristics curves, P(T) at constant loading, were compared to help choose the correct porosity that meets the requirements (pressure, temperature) of a specific application.
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    http://hdl.handle.net/1853/39676
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    • International Cryocooler Conference (16th - 2008 - Atlanta, GA) [89]

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