title: Atmospheric Degradation Initiated by OH Radicals of the Potential Foam Expansion Agent, CF3(CF2)2CH═CH2 (HFC-1447fz): Kinetics and Formation of Gaseous Products and Secondary Organic Aerosols.
abstract: The assessment of the atmospheric impact of the potential foam expansion agent, CF3(CF2)2CH═CH2 (HFC-1447fz), requires the knowledge of its degradation routes, oxidation products, and radiative properties. In this paper, the gas-phase reactivity of HFC-1447fz with OH radicals is presented as a function of temperature, obtaining kOH (T = 263-358 K) = (7.4 ± 0.4) × 10(-13)exp{(161 ± 16)/T} (cm(3)·molecule(-1)·s(-1)) (uncertainties: ±2σ). The formation of gaseous oxidation products and secondary organic aerosols (SOAs) from the OH + HFC-1447fz reaction was investigated in the presence of NOx at 298 K. CF3(CF2)2CHO was observed at low- and high-NOx conditions. Evidence of SOA formation (ultrafine particles in the range 10-100 nm) is reported with yields ranging from 0.12 to 1.79%. In addition, the absolute UV (190-368 nm) and IR (500-4000 cm(-1)) absorption cross-sections of HFC-1447fz were determined at room temperature. No appreciable absorption in the solar actinic region (λ > 290 nm) was observed, leaving the removal by OH radicals as the main atmospheric loss process for HFC-1447fz. The major contribution of the atmospheric loss of HFC-1447fz is due to OH reaction (84%), followed by ozone (10%) and chlorine atoms (6%). Correction of the instantaneous radiative efficiency (0.36 W m(-2)·ppbv(-1)) with the relatively short lifetime of HFC-1447fz (ca. 8 days) implies that its global warming potential at a time horizon of 100 year is negligible (0.19) compared to that of HCFC-141b (782) and to that of modern foam-expansion blowing agents (148, 882, and 804 for HFC-152a, HFC-245fa and HFC-365mfc, respectively).
authors.affiliation: Departamento de Química Física, Facultad de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha (UCLM) , Avenue de Camilo José Cela, s/n, 13071 Ciudad Real, Spain.|Research Institute on Combustion and Atmospheric Pollution (UCLM) , Camino de Moledores 13071 Ciudad Real, Spain.
authors.forename: Elena
authors.initials: E
authors.lastname: Jiménez
authors.affiliation: Departamento de Química Física, Facultad de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha (UCLM) , Avenue de Camilo José Cela, s/n, 13071 Ciudad Real, Spain.
authors.forename: Sergio
authors.initials: S
authors.lastname: González
authors.affiliation: Centre National de la Recherche Scientifique, Institut de Combustion Aérothermique Réactivité et Environnement ICARE/OSUC, CNRS 1C , Avenue de la Recherche Scientifique, 45071 Orléans cedex 02, France.
authors.forename: Mathieu
authors.initials: M
authors.lastname: Cazaunau
authors.affiliation: Centre National de la Recherche Scientifique, Institut de Combustion Aérothermique Réactivité et Environnement ICARE/OSUC, CNRS 1C , Avenue de la Recherche Scientifique, 45071 Orléans cedex 02, France.
authors.forename: Hui
authors.initials: H
authors.lastname: Chen
authors.affiliation: Departamento de Química Física, Facultad de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha (UCLM) , Avenue de Camilo José Cela, s/n, 13071 Ciudad Real, Spain.|Research Institute on Combustion and Atmospheric Pollution (UCLM) , Camino de Moledores 13071 Ciudad Real, Spain.
authors.forename: Bernabé
authors.initials: B
authors.lastname: Ballesteros
authors.affiliation: Centre National de la Recherche Scientifique, Institut de Combustion Aérothermique Réactivité et Environnement ICARE/OSUC, CNRS 1C , Avenue de la Recherche Scientifique, 45071 Orléans cedex 02, France.
authors.forename: Véronique
authors.initials: V
authors.lastname: Daële
authors.affiliation: Departamento de Química Física, Facultad de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha (UCLM) , Avenue de Camilo José Cela, s/n, 13071 Ciudad Real, Spain.|Research Institute on Combustion and Atmospheric Pollution (UCLM) , Camino de Moledores 13071 Ciudad Real, Spain.
authors.forename: José
authors.initials: J
authors.lastname: Albaladejo
authors.affiliation: Centre National de la Recherche Scientifique, Institut de Combustion Aérothermique Réactivité et Environnement ICARE/OSUC, CNRS 1C , Avenue de la Recherche Scientifique, 45071 Orléans cedex 02, France.
authors.forename: Abdelwahid
authors.initials: A
authors.lastname: Mellouki
mesh_terms: D000336:Aerosols / Q000737:chemistry*; D000393:Air Pollutants / Q000737:chemistry*; D001272:Atmosphere; D001673:Biodegradation, Environmental; D002713:Chlorine; D064227:Chlorofluorocarbons, Ethane / Q000737:chemistry; D004777:Environment; D057232:Global Warming; D006845:Hydrocarbons, Fluorinated / Q000737:chemistry*; D017665:Hydroxyl Radical; D007700:Kinetics; D010126:Ozone / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D005466:Fluorocarbons
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D002713:Chlorine; D064227:Chlorofluorocarbons, Ethane; D006845:Hydrocarbons, Fluorinated; D017665:Hydroxyl Radical; D010126:Ozone; C000611096:CF3(CF2)2CHCH2; C068320:1,1-dichloro-1-fluoroethane; C403631:1,1,1,3,3-pentafluoropropane; D005466:Fluorocarbons