Heterogeneous selective oxidation of sulfides with H2O2 catalyzed by ionic liquid - based polyoxometalate salts / Pingping Zhao in Industrial & engineering chemistry research, Vol. 51 N° 19 (Mai 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 19 (Mai 2012) . - pp. 6641-6647 Titre : Heterogeneous selective oxidation of sulfides with H2O2 catalyzed by ionic liquid - based polyoxometalate salts Type de document : texte imprimé Auteurs : Pingping Zhao, Auteur ; Mingjue Zhang, Auteur ; Yajing Wu, Auteur Année de publication : 2012 Article en page(s) : pp. 6641-6647 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Ionic liquid Catalytic reaction Hydrogen peroxide Oxidation Résumé : A group of ionic liquid (LL)-based polyoxometalate (POM) salts were prepared via anion-exchange of imidazolium LL precursors tethered by different carbon chain alkyls with various Keggin POMs. The resultant imidazolium POM salts were tested as the catalysts for oxidation of sulfides with aqueous H2O2. For understanding the POM salt-catalyzed oxidation of sulfides, catalyst compositions, substrates, and reaction conditions were changed. The results show that the imidazolium POM salts are very active and selective heterogeneous catalysts for oxidations of sulfides, adding the advantages of convenient recovery, steady reuse, simple preparation, and flexible composition. Characterizations by Fourier transform infrared (FT-IR), ultraviolet-visible (UV―vis), X-ray diffraction (XRD), and elemental analysis further reveal that the heterogeneous nature of the oxidation processes associates with the good crystallinities of the butyl- and hexyl-functionalized imidazolium POM salts and the hydrogen bonding networks among cations and anions. The POM salts' excellent performances arise from the promoted redox property of the POM-anions by the intramolecular charge transfer from the IL-cations. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25900217 [article] Heterogeneous selective oxidation of sulfides with H2O2 catalyzed by ionic liquid - based polyoxometalate salts [texte imprimé] / Pingping Zhao, Auteur ; Mingjue Zhang, Auteur ; Yajing Wu, Auteur . - 2012 . - pp. 6641-6647. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 19 (Mai 2012) . - pp. 6641-6647 Mots-clés : Ionic liquid Catalytic reaction Hydrogen peroxide Oxidation Résumé : A group of ionic liquid (LL)-based polyoxometalate (POM) salts were prepared via anion-exchange of imidazolium LL precursors tethered by different carbon chain alkyls with various Keggin POMs. The resultant imidazolium POM salts were tested as the catalysts for oxidation of sulfides with aqueous H2O2. For understanding the POM salt-catalyzed oxidation of sulfides, catalyst compositions, substrates, and reaction conditions were changed. The results show that the imidazolium POM salts are very active and selective heterogeneous catalysts for oxidations of sulfides, adding the advantages of convenient recovery, steady reuse, simple preparation, and flexible composition. Characterizations by Fourier transform infrared (FT-IR), ultraviolet-visible (UV―vis), X-ray diffraction (XRD), and elemental analysis further reveal that the heterogeneous nature of the oxidation processes associates with the good crystallinities of the butyl- and hexyl-functionalized imidazolium POM salts and the hydrogen bonding networks among cations and anions. The POM salts' excellent performances arise from the promoted redox property of the POM-anions by the intramolecular charge transfer from the IL-cations. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25900217

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