Design of 3D MnO2/Carbon sphere composite for the catalytic oxidation and adsorption of elemental mercury.

Author(s) Xu, H.; Jia, J.; Guo, Y.; Qu, Z.; Liao, Y.; Xie, J.; Shangguan, W.; Yan, N.
Journal J Hazard Mater
Date Published 2017 Aug 08

Three-dimensional (3D) MnO2/Carbon Sphere (MnO2/CS) composite was synthesized from zero-dimensional carbon spheres and one-dimensional α-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 α-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 600min reaction. In addition, the nano-sized MnO2/CS composite exhibited better SO2 resistance than pure α-MnO2. Moreover, the Hg-TPD results indicated that the adsorbed mercury can release from the surface of MnO2/CS using a thermal decomposition method.

DOI 10.1016/j.jhazmat.2017.08.011
ISSN 1873-3336
Citation J Hazard Mater. 2017;342:6976.

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