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The effects of oxidation of activated carbons are studied by means of high-pressure methane adsorption. Decreases in amounts adsorbed and adsorption enthalpies after oxidation are observed. Thermodynamic analysis of adsorption isotherms using the virial-type thermal equation of adsorption is presented. The calculated adsorption energy distributions are shifted to lower adsorption energies for oxidized carbons. The mean adsorption energies decrease, indicating that oxidized carbon surfaces have lower affinity for methane adsorption.
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Jagiełło et al. (1992) studied this question.
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