Tropospheric degradation products of CH2FCF3 (HFC-134a)

Abstract

Chlorine atom-initiated photooxidations of CH2FCF3 (HFC-134a) in O2-N2 diluent were carried out to identify the products formed from the {Mathematical expression} radical reactions and to determine the product yields as a function of temperature, pressure and O2 concentration. CF3C(O)F and HC(O)F were the major 'first-generation' products observed, along with smaller yields of C(O)F2 and, as yet, undetermined yields of CF3OOOCF3 and CF3OOC(O)F. The relative importance of the two major {Mathematical expression} reaction pathways, is expressed by the rate constant ratio {Mathematical expression} The decomposition reaction leading to HC(O)F and ĊF3 radical products is predicted to be the dominant pathway at the Earth's surface while mainly CF3C(O)F formation will occur at the tropopause. © 1993 Kluwer Academic Publishers.