Surface characterization of iron - modified sepiolite by inverse gas chromatography / Slavica Lazarevic in Industrial & engineering chemistry research, Vol. 50 N° 20 (Octobre 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 20 (Octobre 2011) . - pp. 11467-11475 Titre : Surface characterization of iron - modified sepiolite by inverse gas chromatography Type de document : texte imprimé Auteurs : Slavica Lazarevic, Auteur ; Ivona Jankovic-castvan, Auteur ; Antonije Onjia, Auteur Année de publication : 2011 Article en page(s) : pp. 11467-11475 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Gas chromatography Résumé : Inverse gas chromatography at infinite and finite surface coverages was applied to evaluate the surface properties of an iron-modified sepiolite sorbent, Fe-sepiolite. The adsorptions of different nonpolar and polar probes were measured in the infinite-dilution regime, in the temperature range 483-513 K. For the organic probes used, the thermodynamic parameters (free energy, enthalpy, and entropy) of adsorption and the dispersive and specific components ofthe free energy ofadsorption were determined and are discussed in terms of specific reactions that can occur on the adsorbent surface. Following the approach of Gutmann (The Donor-Acceptor Approach to Molecular Interactions; Plenum Press: New York, 1978), acid/base surface characteristics were determined. The adsorption isotherms of n-hexane, benzene, chloroform, and tetrahydrofuran were used to estimate the specific surface areas, isosteric heats of adsorption, and adsorption energy distributions for the adsorption of organic molecules. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24612368 [article] Surface characterization of iron - modified sepiolite by inverse gas chromatography [texte imprimé] / Slavica Lazarevic, Auteur ; Ivona Jankovic-castvan, Auteur ; Antonije Onjia, Auteur . - 2011 . - pp. 11467-11475. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 20 (Octobre 2011) . - pp. 11467-11475 Mots-clés : Gas chromatography Résumé : Inverse gas chromatography at infinite and finite surface coverages was applied to evaluate the surface properties of an iron-modified sepiolite sorbent, Fe-sepiolite. The adsorptions of different nonpolar and polar probes were measured in the infinite-dilution regime, in the temperature range 483-513 K. For the organic probes used, the thermodynamic parameters (free energy, enthalpy, and entropy) of adsorption and the dispersive and specific components ofthe free energy ofadsorption were determined and are discussed in terms of specific reactions that can occur on the adsorbent surface. Following the approach of Gutmann (The Donor-Acceptor Approach to Molecular Interactions; Plenum Press: New York, 1978), acid/base surface characteristics were determined. The adsorption isotherms of n-hexane, benzene, chloroform, and tetrahydrofuran were used to estimate the specific surface areas, isosteric heats of adsorption, and adsorption energy distributions for the adsorption of organic molecules. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24612368

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