Abstract
Adsorption isotherms of n-hexane and methyl iodide on fibrous carbon material (FCM), both uncoated and coated with 5% w/w triethylene diamine (TEDA), were determined in the temperature span from 303 to 318 K using gas-chromatographic technique. The isotherms obtained are of the BET IV type, suggesting multilayer adsorption. Monolayer capacities were determined for unmodified adsorbents only. Due to the mixed adsorption mechanism acting on the modified FCM, the monolayer capacity of this solid has not been possible to evaluate. It was shown that the adsorption of methyl iodide is greater than for n-hexane. Methyl iodide, in addition, has almost four times larger adsorption on FCM-TEDA compared to the bare solid presumably due to the specific reaction between the adsorbate and TEDA. Isosteric heat of adsorption of the two adsorbates exhibits a maximum in the vicinity of the corresponding monolayer surface capacity, approaching the limiting value of the heat of liquefaction at higher surface loadings.
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