title: A novel method to decompose two potent greenhouse gases: photoreduction of SF6 and SF5CF3 in the presence of propene.
abstract: SF5CF3 and SF6 are the most effective greenhouse gases on a per molecule basis in the atmosphere. Original laboratory trial for photoreduction of them by use of propene as a reactant was performed to develop a novel technique to destroy them. The highly reductive radicals produced during the photolysis of propene at 184.9 nm, such as .CH3, .C2H3, and .C3H5, could efficiently decompose SF6 and SF5CF3 to CH4, elemental sulfur and trace amounts of fluorinated organic compounds. It was further demonstrated that the destruction and removal efficiency (DRE) of SF5X (X represented F or CF3) was highly dependent on the initial propene-to-SF5X ratio. The addition of certain amounts of oxygen and water vapor not only enhanced the DRE but avoided the generation of deposits. In both systems, employment nitrogen as dilution gas lessened the DRE slightly. Given the advantage of less toxic products, the technique might contribute to SF5X remediation.
authors.affiliation: Center for Greenhouse Gas Research, Institute of Environmental Science, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, PR China.
authors.forename: Li
authors.initials: L
authors.lastname: Huang
authors.forename: Yan
authors.initials: Y
authors.lastname: Shen
authors.forename: Wenbo
authors.initials: W
authors.lastname: Dong
authors.forename: Renxi
authors.initials: R
authors.lastname: Zhang
authors.forename: Jianliang
authors.initials: J
authors.lastname: Zhang
authors.forename: Huiqi
authors.initials: H
authors.lastname: Hou
mesh_terms: D000393:Air Pollutants / Q000302:isolation & purification*; D000397:Air Pollution; D000475:Alkenes / Q000737:chemistry*; D001272:Atmosphere; D004867:Equipment Design; D005740:Gases; D017752:Greenhouse Effect; D006845:Hydrocarbons, Fluorinated / Q000737:chemistry / Q000302:isolation & purification*; D008027:Light; D010100:Oxygen / Q000737:chemistry; D010777:Photochemistry / Q000379:methods*; D010782:Photolysis; D017550:Spectroscopy, Fourier Transform Infrared; D013457:Sulfur Compounds / Q000737:chemistry / Q000302:isolation & purification*; D013459:Sulfur Hexafluoride / Q000737:chemistry / Q000302:isolation & purification*; D013696:Temperature
chemical_list: D000393:Air Pollutants; D000475:Alkenes; D005740:Gases; D006845:Hydrocarbons, Fluorinated; C516032:SF5CF3; D013457:Sulfur Compounds; C013658:propylene; D010100:Oxygen; D013459:Sulfur Hexafluoride