Atmospheric chemistry of CF3C[tbnd]CH: Kinetics, products, mechanism of gas-phase reaction with OH radicals, and atmospheric implications-an effort for novel ‘class’ of refrigerant

Abstract

We use the relative method to first evaluate the atmospheric chemistry of CF3CCH that would play significant role in novel refrigerant development. We show that rate constant (kOH) for the gas-phase reaction of CF3CCH with OH radicals at 298 K is measured to be (2.15 ± 0.02) × 10−13 cm3 molecule−1 s−1, with Arrhenius expression as kOH=(3.40 ± 0.46) × 10−12 exp ((-832.70 ± 38.86)/T). Subject to the short atmospheric lifetime of CF3CCH of 53.9 d and radiative efficiency of 0.071 W m−2 ppb−1, the global warming potentials (GWPs) for 20, 100, and 500 yr are 42, 11, and 3, respectively. CF3CCH emissions are predicated to produce CO, CO2, COF2 and CF3O3CF3 as the main carbon-containing products. The photochemical ozone creation potential of the CF3CCH is 2.49 and 1.05 in Northwestern European and US urban areas, respectively. Density functional theory calculations further explained its possible degradation mechanism in atmosphere. Our work provides basic evidence for future molecular design of environmental-friendly CC containing substances.