Issue 13, 2011
From the journal:

Physical Chemistry Chemical Physics

A site energy distribution function from Toth isotherm for adsorption of gases on heterogeneous surfaces†

K. Vasanth Kumar,*a   M. Monteiro de Castro,a   M. Martinez-Escandell,a   M. Molina-Sabioa  and  F. Rodriguez-Reinosoa  

* Corresponding authors

a Laboratorio de Materiales Avanzados, Departamento de Química Inorgánica, Universidad de Alicante, Apartado 99, 030080 Alicante, Spain
E-mail: vasanth@ua.es

Abstract

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.

Graphical abstract: A site energy distribution function from Toth isotherm for adsorption of gases on heterogeneous surfaces

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Article information

DOI
https://doi.org/10.1039/C0CP00902D
Article type
Paper
Submitted
17 Jun 2010
Accepted
14 Jan 2011
First published
14 Feb 2011

Phys. Chem. Chem. Phys., 2011,13, 5753-5759

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A site energy distribution function from Toth isotherm for adsorption of gases on heterogeneous surfaces

K. V. Kumar, M. Monteiro de Castro, M. Martinez-Escandell, M. Molina-Sabio and F. Rodriguez-Reinoso, Phys. Chem. Chem. Phys., 2011, 13, 5753 DOI: 10.1039/C0CP00902D

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