A site energy distribution function from Toth isotherm for adsorption of gases on heterogeneous surfaces
文献信息
K. Vasanth Kumar, M. Monteiro de Castro, M. Martinez-Escandell, M. Molina-Sabio, F. Rodriguez-Reinoso
A site energy distribution function based on a condensation approximation method is proposed for gas-phase adsorption systems following the Toth isotherm. The proposed model is successfully applied to estimate the site energy distribution of three pitch-based activated carbons (PA, PFeA and PBA) developed in our laboratory and also for other common adsorbent materials for different gas molecules. According to the proposed model the site energy distribution curves of the activated carbons are found to be exponential for hydrogen at 77 K. The site energy distribution of some of the activated carbon fibers, ambersorb, Dowex optipore, 13X Zeolite for different adsorbate molecules represents a quasi-Gaussian curve with a widened left hand side, indicating that most sites have adsorption energies lower than a statistical mean value.
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Physical Chemistry Chemical Physics

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