Inhibition of the Hydrogen-Oxygen Reaction by CF₃Br and CF₂BrCF₂Br

Abstract

About ten years ago we published results of shock-tube experiments in which ignition delays of H2 - O2 - Ar mixtures containing either CF3Br or CF2BrCF2Br, were measured (1 , 2). Substantial increases in the ignition delay times were found for the gas mixtures containing halocarbons. These studies also included some product analyses of partially reacted H2-O2-Ar- halocarbon mixtures, and product analyses of shock heated Ar- halocarbon mixtures (with no H2 or O2 present). An attempt was made to interpret the ignition delay data using a set of eleven elementary reactions for hydrogen-oxygen itself, five additional reactions for the CF3Br experiments, and four additional reactions for the CF2BrCF2Br experiments. We were able to adjust the rate constants to give quite good agreement of the calculations with experiment, but it was recognized that rate constants for many of the reactions in the hydrogen- oxygen scheme were uncertain, so that the rate