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Henry’s law constants and isosteric heats of adsorption at zero loading are calculated for several gases adsorbed on multi-wall carbon surfaces for slit-shaped, cylindrical, and spherical geometries. The Henry’s law constant is found to be sensitive to the pore width, surface mean curvature, and number of layers of wall. We examine the importance of multiple layer walls on the heat of adsorption....
The isosteric heat of adsorption in the Henry’s law region is calculated as a function of the pore width for carbon single wall cylindrical nanopores and spherical nanocavities. The maximum isosteric heat of adsorption is obtained for six gas molecules: argon, methane, carbon dioxide, hydrogen, helium, and nitrogen. In addition, the results for cylindrical carbon nanopores are compared with adsorption...
Experimental data for n-pentane adsorbed on BPL activated carbon in a nitrogen environment are reported at ultra-low concentrations into the Henry’s law region. We introduce two methods to prepare pre-equilibrated samples at known loadings. The samples were analyzed by a purge and trap method. Adsorption data were measured at loadings from 1.0 to 0.0001molkg −1 and pressures of 6 to 5×10 ...
The isosteric heat of adsorption in the Henry’s law region is calculated as a function of the width of slit-shaped pores. We determine the pore width where the isosteric heat is a maximum, which is shown to be a strong function of the solid–fluid collision diameter σ sf and a weak function of the solid–fluid well depth potential ϵ sf . Thus, general results are reported for the pore...
A new equation for describing adsorption equilibria of water on activated carbon is developed based on a mechanism proposed by Dubinin. It is Henry’s law consistent, mathematically simple, and explicit in pressure. The model describes the full range of the adsorption isotherm with high accuracy using only a small number of parameters. Adsorption equilibrium data for water on several activated carbons...
Methods to describe and predict adsorption equilibrium using the D-R equation are presented in this paper. We focus on adsorption of organic-water vapor binary mixtures on BPL activated carbon. By adjusting the partial pressure of the organic component in the binary mixture, the effects of the presence of water vapor on adsorption of the organic component are quantitatively expressed using one term...
A method for predicting adsorption equilibrium using a modified Dubinin-Radushkevich (D-R) equation is presented in this paper. We focus on adsorption of pure organic compounds on BPL-activated carbon. We introduce a new variable k v , a volume adjusting coefficient, and simply use V b , the constant molar volume of the adsorbate at its normal boiling temperature, instead of V ...
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