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AuthorBergaoui M.
AuthorNakhli A.
AuthorAl-Muhtaseb S.
AuthorMohamed K.
Available date2020-02-05T08:53:06Z
Publication Date2018
Publication NameJournal of Molecular Liquids
ResourceScopus
ISSN1677322
URIhttp://dx.doi.org/10.1016/j.molliq.2018.01.016
URIhttp://hdl.handle.net/10576/12703
AbstractAdsorption of the n-alkane series, C1-C7, on Westvaco BAX-1100 activated carbon were measured over very broad ranges of temperature (293-393 K) and pressure (0.06-4964 Torr), depending on the n-alkane. Different behaviors of experimental adsorption isotherms were observed where various steps were noticed depending on the adsorbate length. A heterogeneous Gauss-monolayer model was developed based on statistical physics approach to evaluate the adsorption energy distribution (AED). Surface heterogeneity was evaluated and confirmed from isosteric heat of adsorption; where the adsorption of longer n-alkanes is energetically more favorable. A new equation was obtained from AED analysis to calculate the isosteric heat of adsorption. A notable difference between the adsorption isosteric heats estimated from AEDs and those obtained from classical Clausius-Clapeyron equation was observed at very low and high capacities. This difference was explained by the fact that, the gas behaves non-ideally at high pressure range. On the other hand, the absolute percentage deviation in adsorbed phase heat capacity was evaluated from the isosteric heat of adsorption predicted from the AED analysis. This percentage deviation increases when increasing the chain length of the alkane. 2018 Elsevier B.V.
Languageen
PublisherElsevier B.V.
SubjectActivated carbon
Adsorption energy distribution
Heterogeneous surface
Isosteric heats
n-Alkanes
Statistical physics approach
TitleAdsorption process of n-alkanes onto BAX-1100 activated carbon: Theoretical estimation of isosteric heat of adsorption and energy distribution of heterogeneous surfaces
TypeArticle
Pagination399-407
Volume Number252
dc.accessType Abstract Only


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