title: Removal of elemental Mercury from flue gas using wheat straw chars modified by K2FeO4reagent.
abstract: In this article, wheat straw (WS) char, a common agricultural waste and renewable biomass, was pyrolyzed and then modified by K2FeO4reagent to develop an efficient sorbent for removal of Hg0from flue gas. Brunauer-Emmett-Teller, scanning electron microscopy with energy spectrum and X-ray diffraction (XRD) were employed to characterize the sorbents. The effects of K2FeO4loading, reaction temperature, Hg0inlet concentration and concentrations of gas mixtures O2, NO and SO2in flue gas on Hg0removal were investigated in a fixed-bed reactor. The results show that K2FeO4-impregnation can improve pore structure of WS char and produce new active sites, which significantly enhance Hg0removal. Increasing Hg0inlet concentration significantly decreases Hg0removal efficiency. O2in flue gas promotes Hg0oxidation by replenishing the oxygen groups on the surface of modified chars. The presence of NO obviously promotes Hg0removal since it can oxidize Hg0to Hg(NO3)2. SO2in flue gas significantly decreases Hg0removal efficiency due to the competition adsorption between SO2and Hg0. The increase in reaction temperature has a dual impact on Hg0removal.
authors.affiliation: a School of Energy and Power Engineering, Jiangsu University , Zhenjiang , Jiangsu , People's Republic of China.
authors.forename: Jianfei
authors.initials: J
authors.lastname: Zhou
authors.affiliation: a School of Energy and Power Engineering, Jiangsu University , Zhenjiang , Jiangsu , People's Republic of China.
authors.forename: Yangxian
authors.initials: Y
authors.lastname: Liu
authors.affiliation: a School of Energy and Power Engineering, Jiangsu University , Zhenjiang , Jiangsu , People's Republic of China.
authors.forename: Jianfeng
authors.initials: J
authors.lastname: Pan
mesh_terms: D000327:Adsorption; D000393:Air Pollutants / Q000737:chemistry*; D000397:Air Pollution / Q000517:prevention & control*; D000818:Animals; D018533:Biomass; D052918:Environmental Restoration and Remediation / Q000379:methods*; D005740:Gases / Q000737:chemistry; D017745:Incineration; D058085:Iron Compounds / Q000737:chemistry*; D008628:Mercury / Q000737:chemistry*; D010084:Oxidation-Reduction; D017680:Potassium Compounds / Q000737:chemistry*; D014908:Triticum / Q000737:chemistry*
chemical_list: D000393:Air Pollutants; D005740:Gases; D058085:Iron Compounds; D017680:Potassium Compounds; C044384:potassium ferrate; D008628:Mercury
keywords: Elemental mercury; flue gas; modified by K2FeO4 reagent; wheat straw char