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Activation of hydrogen peroxide by an Fe-TAML complex in strongly alkaline aqueous solution / Evan S. Beach in Industrial & engineering chemistry research, Vol. 48 N° 15 (Août 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7072–7076 Titre : Activation of hydrogen peroxide by an Fe-TAML complex in strongly alkaline aqueous solution : homogeneous oxidation catalysis with industrial significance Type de document : texte imprimé Auteurs : Evan S. Beach, Auteur ; Jennifer L. Duran, Auteur ; Sujin K. Horwitz, Auteur Année de publication : 2009 Article en page(s) : pp. 7072–7076 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Hydrogen  peroxide  Fe-TAML  catalysts  Aqueous  solutions Résumé : Hydrogen peroxide is activated by homogeneous Fe-TAML catalysts in aqueous solutions containing very high levels of sodium hydroxide, sodium aluminate, and other inorganic salts. Under these conditions, the Fe-TAML catalyst system facilitates oxidation of humic and humic-derived compounds under ambient conditions and efficiently uses catalyst and oxidant. Darkly colored process liquor from aluminum refining (Bayer liquor) is decolorized by 40−70% (in the wavelength range 450−650 nm) in just 5 min. Humic substances and phenolic species were targeted by the oxidation process. In addition to color reduction, Fe-TAML/H2O2 in 5 M NaOH can also extensively degrade the five- or six-carbon polyols, mannitol, sorbitol, dulcitol, xylitol, and adonitol. This is the first time Fe-TAML catalysts have been shown to activate degradation of carbohydrate alcohols. We show that mannitol, a nuisance contaminant in alumina production, can be oxidized at millimolar levels in process liquor containing a wide variety of other organic components at high background concentrations. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9005723 [article] Activation of hydrogen peroxide by an Fe-TAML complex in strongly alkaline aqueous solution : homogeneous oxidation catalysis with industrial significance [texte imprimé] / Evan S. Beach, Auteur ; Jennifer L. Duran, Auteur ; Sujin K. Horwitz, Auteur . - 2009 . - pp. 7072–7076. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7072–7076 Mots-clés : Hydrogen  peroxide  Fe-TAML  catalysts  Aqueous  solutions Résumé : Hydrogen peroxide is activated by homogeneous Fe-TAML catalysts in aqueous solutions containing very high levels of sodium hydroxide, sodium aluminate, and other inorganic salts. Under these conditions, the Fe-TAML catalyst system facilitates oxidation of humic and humic-derived compounds under ambient conditions and efficiently uses catalyst and oxidant. Darkly colored process liquor from aluminum refining (Bayer liquor) is decolorized by 40−70% (in the wavelength range 450−650 nm) in just 5 min. Humic substances and phenolic species were targeted by the oxidation process. In addition to color reduction, Fe-TAML/H2O2 in 5 M NaOH can also extensively degrade the five- or six-carbon polyols, mannitol, sorbitol, dulcitol, xylitol, and adonitol. This is the first time Fe-TAML catalysts have been shown to activate degradation of carbohydrate alcohols. We show that mannitol, a nuisance contaminant in alumina production, can be oxidized at millimolar levels in process liquor containing a wide variety of other organic components at high background concentrations. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9005723