title: Hg⁰ removal from flue gas by ionic liquid/H₂O₂.
abstract: 1-Alkyl-3-methylimidazolium chloride ionic liquids ([Cnmim] Cl, n=4, 6, 8) were prepared. The ionic liquid was then mixed with hydrogen peroxide (H2O2) to form an absorbent. The Hg(0) removal performance of the absorbent was investigated in a gas/liquid scrubber using simulated flue gas. It was found that the ionic liquid/H2O2 mixture was an excellent absorbent and could be used to remove Hg(0) from flue gas. When the mass ratio of H2O2 to ionic liquid was 0.5, the absorbent showed high Hg(0) removal efficiency (up to 98%). The Hg(0) removal efficiency usually increased with the absorption temperature, while decreased with the increase of alkyl chain length in ionic liquid molecule. The Hg(0) removal mechanism involved with Hg(0) oxidation by H2O2 and Hg(2+) transfer from aqueous phase to ionic liquid phase.
authors.affiliation: National Engineering Research Center of Clean Coal Combustion, Xi'an Thermal Power Research Institute Limited Company, Xi'an 710032, China; Xi'an Jiaotong University, Xi'an 710049, China. Electronic address: cgw2002@sohu.com.
authors.forename: Guangwen
authors.initials: G
authors.lastname: Cheng
authors.affiliation: Xi'an Jiaotong University, Xi'an 710049, China.
authors.forename: Bofeng
authors.initials: B
authors.lastname: Bai
authors.affiliation: National Engineering Research Center of Clean Coal Combustion, Xi'an Thermal Power Research Institute Limited Company, Xi'an 710032, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: National Engineering Research Center of Clean Coal Combustion, Xi'an Thermal Power Research Institute Limited Company, Xi'an 710032, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Cai
mesh_terms: D000393:Air Pollutants / Q000302:isolation & purification*; D000397:Air Pollution / Q000517:prevention & control*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry; D008628:Mercury / Q000302:isolation & purification*
chemical_list: D000393:Air Pollutants; D007093:Imidazoles; D052578:Ionic Liquids; D006861:Hydrogen Peroxide; D008628:Mercury
keywords: Absorbent; Elemental mercury; Flue gas; Ionic liquid; Oxidation