Atmospheric chemistry of (Z)-CF2HCF=CHCl: Kinetics and products of reaction with Cl atoms and OH radicals

Abstract

Long path length FTIR-smog chamber techniques were used to study the title reactions in 650 Torr of N₂, oxygen, or air diluent at 296 ± 3 K. Values of k(Cl + (Z)-CF₂HCF = CHCl)═(6.6 ± 0.7) × 10⁻¹¹ and k(OH + (Z)-CF₂HCF═CHCl)═(4.1 ± 0.7) × 10⁻¹² cm³ molecule⁻¹ s⁻¹ were measured. The IR spectrum of (Z)-CF₂HCF═CHCl is reported. The atmospheric lifetime of (Z)-CF₂HCF═CHCl is determined by the reaction with OH and is approximately 2.8 days. Reaction of (Z)-CF₂HCF═CHCl with Cl atoms gives HC(O)Cl and CF₂HC(O)F as major primary products. Under environmental conditions, the OH radical initiated oxidation gives CF₂HC(O)F and HC(O)Cl in yields of (98 ± 8)% and (100 ± 4)%, respectively. Accounting for non-uniform horizontal and vertical mixing leads to a 100-year time-horizon global warming potential value for (Z)-CF₂HCF═CHCl of essentially zero.