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Elemental mercury capture from flue gas by magnetic Mn–Fe spinel / Shijian Yang in Industrial & engineering chemistry research, Vol. 50 N° 16 (Août 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 16 (Août 2011) . - pp. 9650-9656 Titre : Elemental mercury capture from flue gas by magnetic Mn–Fe spinel : effect of chemical heterogeneity Type de document : texte imprimé Auteurs : Shijian Yang, Auteur ; Yongfu Guo, Auteur ; Naiqiang Yan, Auteur Année de publication : 2011 Article en page(s) : pp. 9650-9656 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Heterogeneity  Gaseous  effluent  Zerovalent  metal Résumé : A stoichiometric nanosized Mn―Fe spinel (Fe2.2Mno0.8O4) was synthesized using a coprecipitation method. After the thermal treatment at 400 °C under air, chemical heterogeneity deriving from the oxidation kinetic difference between Fe2+ and Mn2+/Mn3+ was observed in (Fe2.2Mn0.8)1-δO4. XPS and TEM analyses both pointed a Mn enrichment (especially Mn4+ cation) on the particle's surface. Furthermore, the percent of cation vacancy on the surface increased obviously due to the enrichment of Mn4+ cation on the surface. As a result, the capacity of (Fe2.2Mn0.8)1-δ-400 for elemental mercury capture was generally much better than those of MnOx/γ-Fe2O3, (Fe2.2Mn0.8)1-δO4-200 and Fe2.2Mn0.8O4. Furthermore, the saturation magnetization of (Fe2.2Mn0.8)1-δO4 obviously increased after the thermal treatment under air at 400 °C, which made it easier to separate the sorbent and adsorbed mercury from the fly ash for recycling, regeneration, and safe disposal of the adsorbed mercury. Therefore, (Fe2.2Mn0.8)1-δO4-400 may be a promising sorbent for elemental mercury capture. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24425209 [article] Elemental mercury capture from flue gas by magnetic Mn–Fe spinel : effect of chemical heterogeneity [texte imprimé] / Shijian Yang, Auteur ; Yongfu Guo, Auteur ; Naiqiang Yan, Auteur . - 2011 . - pp. 9650-9656. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 16 (Août 2011) . - pp. 9650-9656 Mots-clés : Heterogeneity  Gaseous  effluent  Zerovalent  metal Résumé : A stoichiometric nanosized Mn―Fe spinel (Fe2.2Mno0.8O4) was synthesized using a coprecipitation method. After the thermal treatment at 400 °C under air, chemical heterogeneity deriving from the oxidation kinetic difference between Fe2+ and Mn2+/Mn3+ was observed in (Fe2.2Mn0.8)1-δO4. XPS and TEM analyses both pointed a Mn enrichment (especially Mn4+ cation) on the particle's surface. Furthermore, the percent of cation vacancy on the surface increased obviously due to the enrichment of Mn4+ cation on the surface. As a result, the capacity of (Fe2.2Mn0.8)1-δ-400 for elemental mercury capture was generally much better than those of MnOx/γ-Fe2O3, (Fe2.2Mn0.8)1-δO4-200 and Fe2.2Mn0.8O4. Furthermore, the saturation magnetization of (Fe2.2Mn0.8)1-δO4 obviously increased after the thermal treatment under air at 400 °C, which made it easier to separate the sorbent and adsorbed mercury from the fly ash for recycling, regeneration, and safe disposal of the adsorbed mercury. Therefore, (Fe2.2Mn0.8)1-δO4-400 may be a promising sorbent for elemental mercury capture. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24425209