Design of MnO2/CeO2-MnO2 hierarchical binary oxides for elemental mercury removal from coal-fired flue gas.

Title Design of MnO2/CeO2-MnO2 hierarchical binary oxides for elemental mercury removal from coal-fired flue gas.
Authors Y. Ma; B. Mu; D. Yuan; H. Zhang; H. Xu
Journal J Hazard Mater
DOI 10.1016/j.jhazmat.2017.03.032
Abstract

MnO2/CeO2-MnO2 hierarchical binary oxide was synthesized for elemental mercury (Hg(0)) removal from coal-fired flue gas. CeO2 in-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 Hg(0) removal experiments results indicated that MnO2/CeO2-MnO2 exhibited excellent Hg(0) removal performance, with an 89% removal efficiency of total 300min at 150°C under 4% O2. MnO2 was the primary active site for Hg(0) catalytic oxidation. The porous structure was beneficial for gaseous mercury physically adsorption. In addition, CeO2 enhanced the oxygen capture performance of the composite and the oxidation performance for MnO2. Moreover, the effects of O2, SO2 and H2O were also tested in this study. O2 promoted the Hg(0) removal reaction. While SO2 and H2O can poison the MnO2 active site, resulted in a low Hg(0) removal efficiency.

Citation Y. Ma; B. Mu; D. Yuan; H. Zhang; H. Xu.Design of MnO2/CeO2-MnO2 hierarchical binary oxides for elemental mercury removal from coal-fired flue gas.. J Hazard Mater. 2017;333:186193. doi:10.1016/j.jhazmat.2017.03.032

Related Elements

Cerium

58 Ce 140.116000000 Cerium

See more Cerium products. Cerium (atomic symbol: Ce, atomic number: 58) is a Block F, Group 3, Period 6 element with an atomic weight of 140.116. The number of electrons in each of cerium's shells is 2, 8, 18, 19, 9, 2 and its electron configuration is [Xe]4f2 6s2. Cerium Bohr ModelThe cerium atom has a radius of 182.5 pm and a Van der Waals radius of 235 pm. In its elemental form, cerium has a silvery white appearance. Cerium is the most abundant of the rare earth metals. It is characterized chemically by having two valence states, the +3 cerous and +4 ceric states. The ceric state is the only non-trivalent rare earth ion stable in aqueous solutions. Elemental CeriumIt is therefore strongly acidic and oxidizing, in addition to being moderately toxic.The cerous state closely resembles the other trivalent rare earths. Cerium is found in the minerals allanite, bastnasite, hydroxylbastnasite, monazite, rhabdophane, synchysite and zircon. Cerium was discovered by Martin Heinrich Klaproth, Jöns Jakob Berzelius, and Wilhelm Hisinger in 1803 and first isolated by Carl Gustaf Mosander in 1839. The element was named after the asteroid Ceres, which itself was named after the Roman god of agriculture.

Manganese

25 Mn 54.938045000 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."

Related Forms & Applications

Oxides
Publish your research on the American Elements website