Abstract
Isotherms for adsorption of H2, CH4, N2, CO, Ar, CO2, and Kr were measured at two temperatures (∼32.0 and ∼69.0°C) over a pressure range of 0-18.0 atm on silicalite. The isosteric heats of adsorption for these gases at the limit of zero coverage increased as the polarizability of the adsorbate increased. An enhancement in the heat was introduced for CO2, CO, and N2 adsorption due to the presence of permanent poles in these gases. All isotherms were Type I, but the Henry's Law constants and the overall shapes were very different for the gases. The homogeneous multisite Langmuir model described the isotherms very well. The variations in isosteric heats of adsorption as functions of adsorbate loadings were very small for all gases, indicating that silicalite was an energetically homogeneous adsorbent for the adsorption of these gases.
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