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Direct oxidation of methane to a methanol derivative using molecular oxygen / Jiongliang Yuan in Industrial & engineering chemistry research, Vol. 50 N° 10 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6513-6516 Titre : Direct oxidation of methane to a methanol derivative using molecular oxygen Type de document : texte imprimé Auteurs : Jiongliang Yuan, Auteur ; Lanlan Wang, Auteur ; Yan Wang, Auteur Année de publication : 2011 Article en page(s) : pp. 6513-6516 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Oxidation Résumé : A direct selective oxidation of methane to a methanol derivative with the catalysis of palladium acetate/ benzoquinone/molybdovanado-phosphoric acid using molecular oxygen in trifluoroacetic acid has been suggested. Methyl trifluoroacetate is the only liquid product, and its highest yield could be obtained at 80-100 °C. The addition of perfluorooctane could improve the yield of methyl trifluoroacetate significantly. The reaction product can be easily separated from the reaction system, using the difference of boiling points. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158950 [article] Direct oxidation of methane to a methanol derivative using molecular oxygen [texte imprimé] / Jiongliang Yuan, Auteur ; Lanlan Wang, Auteur ; Yan Wang, Auteur . - 2011 . - pp. 6513-6516. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6513-6516 Mots-clés : Oxidation Résumé : A direct selective oxidation of methane to a methanol derivative with the catalysis of palladium acetate/ benzoquinone/molybdovanado-phosphoric acid using molecular oxygen in trifluoroacetic acid has been suggested. Methyl trifluoroacetate is the only liquid product, and its highest yield could be obtained at 80-100 °C. The addition of perfluorooctane could improve the yield of methyl trifluoroacetate significantly. The reaction product can be easily separated from the reaction system, using the difference of boiling points. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158950

Photodegradation of sulfadiazine by goethite - oxalates uspension under UV light irradiation / Yan Wang in Industrial & engineering chemistry research, Vol. 49 N° 8 (Avril 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3527–3532 Titre : Photodegradation of sulfadiazine by goethite - oxalates uspension under UV light irradiation Type de document : texte imprimé Auteurs : Yan Wang, Auteur ; juan boo Liang, Auteur ; xin di Liao, Auteur Année de publication : 2010 Article en page(s) : pp. 3527–3532 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Photodegradation  UV  light Résumé : Sulfadiazine, a potent antibacterial agent belonging to the group of antibiotics called sulfonamides, has been reported to be present in surface and groundwater. This study investigated the degradation of sulfadiazine in a goethite (α-FeOOH)−oxalate Fenton-like system under UV irradiation. The results showed that sulfadiazine could be effectively photodegraded by the goethite−oxalate Fenton-like system as a result of the formation of the highly oxidizing hydroxyl radicals, •OH. Among the iron oxides tested (α-FeOOH, γ-Fe2O3, γ-FeOOH, and α-Fe2O3), α-FeOOH was found to be the most effective. Degradation of sulfadiazine depended significantly on the pH and initial concentration of oxalic acid in the system, with optimal values of 3.5 and 4.0 mM, respectively, under UV irradiation. Five intermediate products of sulfadiazine degradation were identified using high-performance liquid chromatography−mass spectrometry (HPLC−MS), gas chromatography−mass spectrometry (GC−MS), and ion chromatography (IC), and a possible sulfadiazine degradation pathway in such a system was proposed. Organic sulfur and organic nitrogen mineralization were also observed, and the results indicated that cleavage of the sulfonylurea bridge was easier than the other potential cleavage bonds under the goethite−oxalate system. In addition, results from Biolog assays suggested that the ecological toxicity of the sulfadiazine solution was effectively reduced after degradation. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9014974 [article] Photodegradation of sulfadiazine by goethite - oxalates uspension under UV light irradiation [texte imprimé] / Yan Wang, Auteur ; juan boo Liang, Auteur ; xin di Liao, Auteur . - 2010 . - pp. 3527–3532. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3527–3532 Mots-clés : Photodegradation  UV  light Résumé : Sulfadiazine, a potent antibacterial agent belonging to the group of antibiotics called sulfonamides, has been reported to be present in surface and groundwater. This study investigated the degradation of sulfadiazine in a goethite (α-FeOOH)−oxalate Fenton-like system under UV irradiation. The results showed that sulfadiazine could be effectively photodegraded by the goethite−oxalate Fenton-like system as a result of the formation of the highly oxidizing hydroxyl radicals, •OH. Among the iron oxides tested (α-FeOOH, γ-Fe2O3, γ-FeOOH, and α-Fe2O3), α-FeOOH was found to be the most effective. Degradation of sulfadiazine depended significantly on the pH and initial concentration of oxalic acid in the system, with optimal values of 3.5 and 4.0 mM, respectively, under UV irradiation. Five intermediate products of sulfadiazine degradation were identified using high-performance liquid chromatography−mass spectrometry (HPLC−MS), gas chromatography−mass spectrometry (GC−MS), and ion chromatography (IC), and a possible sulfadiazine degradation pathway in such a system was proposed. Organic sulfur and organic nitrogen mineralization were also observed, and the results indicated that cleavage of the sulfonylurea bridge was easier than the other potential cleavage bonds under the goethite−oxalate system. In addition, results from Biolog assays suggested that the ecological toxicity of the sulfadiazine solution was effectively reduced after degradation. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9014974