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

Title Design of 3D MnO2/Carbon sphere composite for the catalytic oxidation and adsorption of elemental mercury.
Authors H. Xu; J. Jia; Y. Guo; Z. Qu; Y. Liao; J. Xie; W. Shangguan; N. Yan
Journal J Hazard Mater
DOI 10.1016/j.jhazmat.2017.08.011
Abstract

Three-dimensional (3D) MnO2/Carbon Sphere (MnO2/CS) composite was synthesized from zero-dimensional carbon spheres and one-dimensional ?-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 ?-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 ?-MnO2. Moreover, the Hg-TPD results indicated that the adsorbed mercury can release from the surface of MnO2/CS using a thermal decomposition method.

Citation H. Xu; J. Jia; Y. Guo; Z. Qu; Y. Liao; J. Xie; W. Shangguan; N. Yan.Design of 3D MnO2/Carbon sphere composite for the catalytic oxidation and adsorption of elemental mercury.. J Hazard Mater. 2017;342:6976. doi:10.1016/j.jhazmat.2017.08.011

Related Elements

Manganese

See more Manganese products. Manganese (atomic symbol: Mn, atomic number: 25) is a Block D, Group 7, Period 4 element with an atomic weight of 54.938045. Manganese Bohr ModelThe number of electrons in each of Manganese's shells is [2, 8, 13, 2] and its electron configuration is [Ar] 3d5 4s2. The manganese atom has a radius of 127 pm and a Van der Waals radius of 197 pm. Manganese was first discovered by Torbern Olof Bergman in 1770 and first isolated by Johann Gottlieb Gahn in 1774. In its elemental form, manganese has a silvery metallic appearance. Elemental ManganeseIt is a paramagnetic metal that oxidizes easily in addition to being very hard and brittle. Manganese is found as a free element in nature and also in the minerals pyrolusite, braunite, psilomelane, and rhodochrosite. The name Manganese originates from the Latin word mangnes, meaning "magnet."

Mercury

Mercury Bohr ModelSee more Mercury products. Mercury (atomic symbol: Hg, atomic number: 80) is a Block D, Group 12, Period 6 element with an atomic weight of 200.59. The number of electrons in each of mercury's shells is 2, 8, 18,32, 18, 2 and its electron configuration is [Xe] 4f14 5d10 6s2. The mercury atom has a radius of 151 pm and a Van der Waals radius of 209 pm. It is named after the planet Mercury and often referred to as "quicksilver" due to its appearance as a silvery liquid. Mercury has low melting and boiling points. It is a poor conductor of heat, but a fair conductor of electricity. Mercury is found both as a free element and in cinnabar, corderoite, and livingstonite ores.

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