Reaction of Carbon Dioxide with Atomic Oxygen and the Dissociation of Carbon Dioxide in Shock Waves

Abstract

The reaction of oxygen atoms with carbon dioxide has been investigated from 2800–3200°K using the decomposition of N2O as a source of oxygen atoms: O+CO2→CO+O2 (1). Over the temperature range, the value of k1 was found to be logk1 = − 10.59(± 0.79) − (32 500 ± 10 900) / 4.58 T cm3/particle sec, which is much larger than the recent literature value. The addition of molecular oxygen decreased the observed rate of CO2 removal in Reaction (1). The decomposition of CO2 in the second-order pressure region in neon diluent was investigated over the temperature range 2900–4000°K, and it was shown that the contribution of Reaction (1) to the gross decomposition rate is significant, but does not account for the anomalously low activation energy of CO2 decomposition. The corrected first-order rate constant for the reaction CO2+Ne→CO+O+Ne (2) at a density of 1.35 × 1018particle/cm3, is logk2 = 7.71 (± 0.36) − (74 100 ± 6300) / 4.58T sec−1. The rate constant for the reaction O3+NO→N+O2 (3) is estimated as k3 = 1.5 × 10−14cm3/particle·sec at 3000°K, and a suggested upper limit for the rate constant of the reaction NO+CO2→NO2+CO (6), is k6 ≤ 5 × 10−15cm3/particle·sec at the same temperature.