Investigation of the Reaction of 3CH2 with NO at high Temperatures

The reaction 3CH2 + NO was studied behind incident shock waves over the temperature range 1100–2600 K by following the H and O atom formation with Atomic Resonance Absorption Spectroscopy (ARAS) and the OH radical formation with Laser Absorption. In the temperature range from 1100 to 2500 K the rate constant of the H atom formation formally attributed to a reaction channel giving HCNO+H (1 h) obtained on the basis of the experiments reported here is k1h = 10(12.4 ± 0.2).exp (‐(25 ± 2) kJ mol−1/RT) cm3 mol−1 s−1. The rate constant of the channel leading to HCN + OH (1d) was determined to be k1d = 10(11.7 ± 0.3).exp (‐(12 ± 2) kJ mol−1/RT) cm3 mol−1 s−1. The evaluation of the experimental profiles by means of computer simulation leads to an overall rate constant of about k1 = (1 ± 0.5)·1012cm3mol−1 s−1 without any noticeable temperature dependence within the error limits in the temperature range from 1200 to 2600 K. The contribution of a reaction channel leading directly or indirectly to O (or N) atoms was found to be less than 15% of the overall reaction at temperatures below 2000 K.