title: Conversion of elemental mercury with a novel membrane catalytic system at low temperature.
abstract: A unique assembly, which integrated membrane delivery for oxidants with catalytic oxidation (MDCOs), was employed to convert elemental mercury (Hg(0)) to its oxidized form at low temperature (around 150 °C). MnO(x) was used as the main catalytic component in MDCOs with Mo and/or Ru to improve the catalytic activity. The MDCOs was proved to be very effective for the conversion of Hg(0) compared with the traditional catalytic oxidation mode (TCO). The analysis of speciation for Hg after catalytic oxidation showed that there was mainly mercury (II) chloride. The addition of transition metals of Mo and Ru obviously improved the conversion of Hg(0) to Hg(2+) and enhanced the activity of the MDCOs at low temperature, and the conversion efficiency of Hg(0) reached 95% with Mo-Ru-Mn catalyst and 8 ppmv HCl. The inhibition of SO(2) to Hg(0) conversion in the MDCOs was insignificant. The Hg(0) removal exceeded 80% even if the concentration of SO(2) reached 1000 ppmv. The results also indicated that the Deacon reaction with the yield of Cl(2) were significantly improved after modified, and MDCOs with Mo-Ru-Mn catalyst can work efficiently at low temperature.
authors.affiliation: School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China.
authors.forename: Yongfu
authors.initials: Y
authors.lastname: Guo
authors.forename: Naiqiang
authors.initials: N
authors.lastname: Yan
authors.forename: Shijian
authors.initials: S
authors.lastname: Yang
authors.forename: Ping
authors.initials: P
authors.lastname: Liu
authors.forename: Juan
authors.initials: J
authors.lastname: Wang
authors.forename: Zan
authors.initials: Z
authors.lastname: Qu
authors.forename: Jinping
authors.initials: J
authors.lastname: Jia
mesh_terms: D002384:Catalysis; D006851:Hydrochloric Acid / Q000737:chemistry; D017895:Manganese Compounds / Q000737:chemistry; D008567:Membranes, Artificial; D008628:Mercury / Q000032:analysis*; D008982:Molybdenum / Q000737:chemistry; D016877:Oxidants / Q000737:chemistry; D010087:Oxides / Q000737:chemistry; D012428:Ruthenium / Q000737:chemistry; D013458:Sulfur Dioxide / Q000737:chemistry; D013464:Sulfuric Acids / Q000737:chemistry; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D017895:Manganese Compounds; D008567:Membranes, Artificial; D016877:Oxidants; D010087:Oxides; D013464:Sulfuric Acids; D013458:Sulfur Dioxide; C027424:manganese oxide; D012428:Ruthenium; D008982:Molybdenum; D008628:Mercury; D006851:Hydrochloric Acid