Stabilization of mercury over Mn-based oxides: Speciation and reactivity by temperature programmed desorption analysis
Stabilization of mercury over Mn-based oxides: Speciation and reactivity by temperature programmed desorption analysis
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汞在锰基氧化物上的稳定性：通过程序升温解吸分析的形态和反应性
DOI：
10.1016/j.jhazmat.2016.09.030
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发表时间：
2017
影响因子：
13.6
通讯作者：
Yan Naigiang
中科院分区：
文献类型：
--
作者：
Xu Haomiao;Ma Yongpeng;Huang Wenjun;Mei Jian;Zhao Songjian;Qu Zan;Yan Naigiang
Mercury temperature-programmed desorption (Hg-TPD) method was employed to clarify mercury species over Mn-based oxides. The elemental mercury (Hg0) removal mechanism over MnOxwas ascribed to chemical-adsorption. HgO was the primary mercury chemical compound adsorbed on the surface of MnOx. Rare earth element (Ce), main group element (Sn) and transition metal elements (Zr and Fe) were chosen for the modification of MnOx. Hg-TPD results indicated that the binding strength of mercury on these binary oxides followed the order of Sn-MnOx< Ce-MnOx∼ MnOx< Fe-MnOx< Zr-MnOx. The activation energies for desorption were calculated and they were 64.34, 101.85, 46.32, 117.14, and 106.92 eV corresponding to MnOx, Ce-MnOx, Sn-MnOx, Zr-MnOxand Fe-MnOx, respectively. Sn-MnOxhad a weak bond of mercury (Hg-O), while Zr-MnOxhad a strong bond (Hgtriple bondO). Ce-MnOxand Fe-MnOxhad similar bonds compared with pure MnOx. Moreover, the effects of SO2and NO were investigated based on Hg-TPD analysis. SO2had a poison effect on Hg0removal, and the weak bond of mercury can be easily destroyed by SO2. NO was favorable for Hg0removal, and the bond strength of mercury was enhanced.
