title: Stabilization of mercury over Mn-based oxides: Speciation and reactivity by temperature programmed desorption analysis.
abstract: 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 106.92eV 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 (HgO). 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.
authors.affiliation: School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Haomiao
authors.initials: H
authors.lastname: Xu
authors.affiliation: Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, Zhengzhou University of Light Industry, No. 136, Science Avenue, Zhengzhou 450001, China.
authors.forename: Yongpeng
authors.initials: Y
authors.lastname: Ma
authors.affiliation: School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Wenjun
authors.initials: W
authors.lastname: Huang
authors.affiliation: School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Mei
authors.affiliation: School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Songjian
authors.initials: S
authors.lastname: Zhao
authors.affiliation: School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Zan
authors.initials: Z
authors.lastname: Qu
authors.affiliation: School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. Electronic address: nqyan@sjtu.edu.cn.
authors.forename: Naiqiang
authors.initials: N
authors.lastname: Yan
keywords: Adsorption; Elemental mercury; Manganese oxides; Mercury species