Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 342, Issue -, Pages 69-76Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2017.08.011
Keywords
Elemental mercury; Carbon sphere; Catalytic oxidation; Hierarchical structure
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Funding
- National Key R&D Program of China [2017YFC0210502]
- Major State Basic Research Development Program of China (973 Program) [2013CB430005]
- National Natural Science Foundation of China [51478261, 21677096]
- Natural Science Foundation of Jiangsu Province [BK 20141179]
- postdoctoral innovative talent plans [BX201700151]
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Three-dimensional (3D) MnO2/Carbon Sphere (MnO2/CS) composite was synthesized from zero dimensional carbon spheres and one-dimensional alpha-MnO2 using hydrothermal method. The hierarchical MnO2/CS composite was applied for the catalytic oxidation and adsorption of elemental mercury (Hg-0) from coal-fired flue gas. The characterization results indicated that this composite exhibits a 3D urchin morphology. Carbon spheres act as the core and alpha-MnO2 nano-rods grew on the surface of carbon spheres. This 3D hierarchical structure benefits the enlargement of surface areas and pore volumes. Hg-0 removal experimental results indicated that the MnO2/CS composite has an outstanding Hg-0 removal performance due to the higher catalytic oxidation and adsorption performance. MnO2/CS composite had higher than 99% Hg-0 removal efficiency even after 600 min reaction. In addition, the nano-sized MnO2/CS composite exhibited better SO2 resistance than pure alpha-MnO2. Moreover, the Hg-TPD results indicated that the adsorbed mercury can release from the surface of MnO2/CS using a thermal decomposition method. (C) 2017 Elsevier B.V. All rights reserved.
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