The adsorption equilibria for benzene and toluene vapors on commercially available activated carbon fiber were measured by a static volumetric technique. The equilibrium measurements were made at 298.15, 323.15, and 348.15 K and pressures up to 8.7 kPa for benzene and 3.4 kPa for toluene, respectively. The results were correlated by the Dubinin−Astakhov equation, which is a fundamental theoretical relation for describing the filling of micropores.

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The adsorption isotherms of benzene and methylbenzene vapors on activated carbon were obtained by a static volumetric apparatus. The measurements were done at 303.15, 313.15, 323.15, 333.15, and 343.15 K and pressures up to 7 kPa for benzene and 2 kPa for methylbenzene, respectively. The experimental data obtained were correlated by the UNILAN equation, which is generally used for heterogeneous adsorbents such as activated carbon.

Adsorption data for CH4, C2H6, C2H4, H2, and N2 on the zeolite 5A adsorbent (W. R. Grace & Davision Co.) were obtained at 293 K, 303 K, and 313 K. The pressure range studied was 0 to 2 MPa, which covers the operating pressure range in pressure swing adsorption (PSA) units. Experimental data were correlated by the Langmuir and Langmuir−Freundlich (L−F) equations for several isotherm models. This paper compares the Langmuir and L−F equations. Despite the relative simplicity of both isotherms, the experimental data were fit very well. In addition, the Clausius−Clapeyron equation was employed to calculate the isosteric enthalpy of adsorption.

Potassium iodide (KI) impregnated activated carbons were prepared and applied for the removal of hydrogen sulfide. The adsorption dynamics of the prepared adsorbents were investigated in fixed-bed column as functions of the concentration of hydrogen sulfide and oxygen, and relative humidity. It was found that the adsorption capacity was highly dependent on the oxygen concentration because of the chemical adsorption of hydrogen sulfide on KI impregnated activated carbon. The adsorbents before and after adsorption of hydrogen sulfide were characterized by BET, SEM and EDS analysis.