title: Design of MnO2/CeO2-MnO2hierarchical binary oxides for elemental mercury removal from coal-fired flue gas.
abstract: MnO2/CeO2-MnO2hierarchical binary oxide was synthesized for elemental mercury (Hg0) removal from coal-fired flue gas. CeO2in-situ grow on the surface of carbon spheres, and that CeO2@CSs acted as precursor for porous MnO2/CeO2-MnO2. XRD, Raman, XPS, FT-IR, and H2-TPR were selected for the physical structural and chemical surface analysis. The results indicated that the composite has sufficient surface oxygen and hierarchical porous structure. The Hg0removal experiments results indicated that MnO2/CeO2-MnO2exhibited excellent Hg0removal performance, with an 89% removal efficiency of total 300min at 150°C under 4% O2. MnO2was the primary active site for Hg0catalytic oxidation. The porous structure was beneficial for gaseous mercury physically adsorption. In addition, CeO2enhanced the oxygen capture performance of the composite and the oxidation performance for MnO2. Moreover, the effects of O2, SO2and H2O were also tested in this study. O2promoted the Hg0removal reaction. While SO2and H2O can poison the MnO2active site, resulted in a low Hg0removal efficiency.
authors.affiliation: Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Material and Chemical Engineering, Zhengzhou University of Light Industry, No. 136, Science Avenue, Zhengzhou 450001, China.
authors.forename: Yongpeng
authors.initials: Y
authors.lastname: Ma
authors.affiliation: Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Material and Chemical Engineering, Zhengzhou University of Light Industry, No. 136, Science Avenue, Zhengzhou 450001, China.
authors.forename: Bailong
authors.initials: B
authors.lastname: Mu
authors.affiliation: Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Material and Chemical Engineering, Zhengzhou University of Light Industry, No. 136, Science Avenue, Zhengzhou 450001, China.
authors.forename: Dongli
authors.initials: D
authors.lastname: Yuan
authors.affiliation: Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Material and Chemical Engineering, Zhengzhou University of Light Industry, No. 136, Science Avenue, Zhengzhou 450001, China.
authors.forename: Hongzhong
authors.initials: H
authors.lastname: Zhang
authors.affiliation: School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. Electronic address: xuhaomiao@sjtu.edu.cn.
authors.forename: Haomiao
authors.initials: H
authors.lastname: Xu
keywords: Adsorption; Elemental mercury; Hierarchical oxides; Manganese oxide