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Removal of branched dibenzothiophenes from hydrocarbon mixtures via charge transfer complexes with a TAPA-functionalized adsorbent / Xiaolin Wei in Industrial & engineering chemistry research, Vol. 47 N° 13 (Juillet 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 13 (Juillet 2008) . - p. 4448–4454 Titre : Removal of branched dibenzothiophenes from hydrocarbon mixtures via charge transfer complexes with a TAPA-functionalized adsorbent Type de document : texte imprimé Auteurs : Xiaolin Wei, Auteur ; Scott M. Husson, Auteur Année de publication : 2008 Article en page(s) : p. 4448–4454 Note générale : Bibliogr. p. 4454 Langues : Anglais (eng) Mots-clés : Dibenzothiophenes;  TAPA-functionalized  adsorbent;  Adsorption  capacity Résumé : A direct grafting method has been demonstrated to successfully incorporate the π-acceptor, 2,4,5,7-tetranitro-9-fluorenylideneaminooxy propionic acid (TAPA), onto silica. Adsorption isotherms were measured for complexation of 4,6-dimethyldibenzothiophene (4,6-DMDBT) from n-heptane onto the TAPA-functionalized silica adsorbent. At 25 °C, maximum adsorption capacity was measured to be 58.6 mg/g for binding 4,6-DMDBT, which is 4-fold higher than that of the nonfunctionalized, bare silica sample with a surface area of 480 m2/g. The results from batch studies suggest that adsorption occurs via a 1:1 complexation between 4,6-DMDBT and TAPA. Adsorption isotherm data were collected at 0, 25, and 40 °C; these data were used to develop a relationship between the Henry’s constant for adsorption and temperature. The molar enthalpy of adsorption was calculated to be ΔHads = −12.1 kJ/mol; this value is evidence for formation of π-electron acceptor−donor complexes. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie070818u [article] Removal of branched dibenzothiophenes from hydrocarbon mixtures via charge transfer complexes with a TAPA-functionalized adsorbent [texte imprimé] / Xiaolin Wei, Auteur ; Scott M. Husson, Auteur . - 2008 . - p. 4448–4454. Bibliogr. p. 4454 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 13 (Juillet 2008) . - p. 4448–4454 Mots-clés : Dibenzothiophenes;  TAPA-functionalized  adsorbent;  Adsorption  capacity Résumé : A direct grafting method has been demonstrated to successfully incorporate the π-acceptor, 2,4,5,7-tetranitro-9-fluorenylideneaminooxy propionic acid (TAPA), onto silica. Adsorption isotherms were measured for complexation of 4,6-dimethyldibenzothiophene (4,6-DMDBT) from n-heptane onto the TAPA-functionalized silica adsorbent. At 25 °C, maximum adsorption capacity was measured to be 58.6 mg/g for binding 4,6-DMDBT, which is 4-fold higher than that of the nonfunctionalized, bare silica sample with a surface area of 480 m2/g. The results from batch studies suggest that adsorption occurs via a 1:1 complexation between 4,6-DMDBT and TAPA. Adsorption isotherm data were collected at 0, 25, and 40 °C; these data were used to develop a relationship between the Henry’s constant for adsorption and temperature. The molar enthalpy of adsorption was calculated to be ΔHads = −12.1 kJ/mol; this value is evidence for formation of π-electron acceptor−donor complexes. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie070818u