Estimating the pore size distribution of activated carbons from adsorption data of different adsorbates by various methods

Gauden, P, Terzyk, A, Rychlicki, G, Kowalczyk, P, Cwiertnia, M and Garbacz, J 2004, 'Estimating the pore size distribution of activated carbons from adsorption data of different adsorbates by various methods', Journal of Colloid and Interface Science, vol. 273, no. 1, pp. 39-63.


Document type: Journal Article
Collection: Journal Articles

Title Estimating the pore size distribution of activated carbons from adsorption data of different adsorbates by various methods
Author(s) Gauden, P
Terzyk, A
Rychlicki, G
Kowalczyk, P
Cwiertnia, M
Garbacz, J
Year 2004
Journal name Journal of Colloid and Interface Science
Volume number 273
Issue number 1
Start page 39
End page 63
Total pages 25
Publisher Academic Press
Abstract Experimental adsorption isotherms of four adsorbates (N2, Ar, C6H6, and CCl4) as well as adsorption enthalpy (C6H6 and CCl4) measured on two strictly microporous carbons are used to evaluate the porosity of adsorbents (i.e., pore size distributions (PSDs) and average pore diameter (Lav)). The influence of the diameter of adsorbates (dA) as well as of the temperature (T) is analyzed in order to explain the differences or similarities between the above-mentioned quantities for all systems. Proposed previously, the general relationships between the parameters of the Dubinin-Astakhov (DA) isotherm equation (the characteristic energy of adsorption (E0) and the exponent of this equation (n)) and the average slit-width of carbon micropores are investigated. Moreover, the thermodynamic verification of the Horvath-Kawazoe (HK) theory and the ND model is presented based on data of the adsorption and enthalpy of adsorption of benzene and carbon tetrachloride on two carbons. Finally, the pore diameters calculated from calorimetry data using the Everett and Powl method and those calculated applying the recently developed equations are compared. In our opinion the change of apparent PSD should be monitored by performing a series of isotherm measurements from high (equal and higher than room temperature) to low temperatures (ca. 77.5 K) as was presented in the current study. Moreover, the analysis of the experimental data leads to the conclusion that the entropy of C6H6 and CCl4 can approach to the values characteristic of quasi-solid (a partially ordered structure). Therefore, this behavior of the adsorbate should be taken into consideration in the theoretical assumptions of model and its thermodynamic verification.
Subject Physical Chemistry not elsewhere classified
DOI - identifier 10.1016/j.jcis.2003.08.033
ISSN 0021-9797
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