Adsorption and catalytic oxidation of gaseous elemental mercury in flue gas over MnOx/alumina / Shaohua Qiao in Industrial & engineering chemistry research, Vol. 48 N° 7 (Avril 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3317–3322 Titre : Adsorption and catalytic oxidation of gaseous elemental mercury in flue gas over MnOx/alumina Type de document : texte imprimé Auteurs : Shaohua Qiao, Auteur ; Chen, Jie, Auteur ; Jianfeng Li, Auteur Année de publication : 2009 Article en page(s) : pp. 3317–3322 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : MnOx/alumina catalysts Flue gas Hydrogen chloride Adsorption Résumé : MnOx/Al2O3 catalysts (i.e., impregnating manganese oxide on alumina) were employed to remove elemental mercury (Hg0) from flue gas. MnOx/Al2O3 was found to have significant adsorption performance on capturing Hg0 in the absence of hydrogen chloride (HCl), and its favorable adsorption temperature was about 600 K. However, the catalytic oxidation of Hg0 became dominant when HCl or chlorine (Cl2) was present in flue gas, and the removal efficiency of Hg0 was up to 90% with 20 ppm of HCl or 2 ppm of Cl2. In addition, the catalysts with adsorbed mercury could be chemically regenerated by rinsing with HCl gas to strip off the adsorbed mercury in the form of HgCl2. Sulfur dioxide displayed inhibition to the adsorption of Hg0on the catalysts, but the inhibition was less to the catalytic oxidation of Hg0, especially in the presence of Cl2. The analysis results of XPS and pyrolysis−AAS indicated that the adsorbed mercury was mainly in the forms of mercuric oxide (HgO) and the weakly bonded speciation, and the ratio of them varied with the adsorption amount and manganese content on catalysts. The multifunctional performances of MnOx/Al2O3 on the removal of Hg0 appeared to be promising in the industrial applications. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801478w [article] Adsorption and catalytic oxidation of gaseous elemental mercury in flue gas over MnOx/alumina [texte imprimé] / Shaohua Qiao, Auteur ; Chen, Jie, Auteur ; Jianfeng Li, Auteur . - 2009 . - pp. 3317–3322. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3317–3322 Mots-clés : MnOx/alumina catalysts Flue gas Hydrogen chloride Adsorption Résumé : MnOx/Al2O3 catalysts (i.e., impregnating manganese oxide on alumina) were employed to remove elemental mercury (Hg0) from flue gas. MnOx/Al2O3 was found to have significant adsorption performance on capturing Hg0 in the absence of hydrogen chloride (HCl), and its favorable adsorption temperature was about 600 K. However, the catalytic oxidation of Hg0 became dominant when HCl or chlorine (Cl2) was present in flue gas, and the removal efficiency of Hg0 was up to 90% with 20 ppm of HCl or 2 ppm of Cl2. In addition, the catalysts with adsorbed mercury could be chemically regenerated by rinsing with HCl gas to strip off the adsorbed mercury in the form of HgCl2. Sulfur dioxide displayed inhibition to the adsorption of Hg0on the catalysts, but the inhibition was less to the catalytic oxidation of Hg0, especially in the presence of Cl2. The analysis results of XPS and pyrolysis−AAS indicated that the adsorbed mercury was mainly in the forms of mercuric oxide (HgO) and the weakly bonded speciation, and the ratio of them varied with the adsorption amount and manganese content on catalysts. The multifunctional performances of MnOx/Al2O3 on the removal of Hg0 appeared to be promising in the industrial applications. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801478w

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