Study of the pyrolysis of H2O2 in the presence of H2and CO by use of UV absorption of HO2

In dissociation experiments of H₂O₂ under shock wave conditions, the spectra of H₂O₂ and HO₂ have been observed in the UV at 2200 ≤ 2800 Å. By the use of these spectra the H₂O₂ decomposition in the presence of H₂ and CO at 870 ≤ T ≤ 1000°K has been analyzed. It was found that in this temperature range, in contrast to low temperature behavior, reactions of H atoms with H₂O₂ and with HO₂ are equally important. The rate of the reaction H + H₂O₂ ← HO₂ + H₂ was estimated in comparison with the rate of the reaction between H and HO₂. Good agreement between calculated and measured concentration profiles of HO₂ and H₂O₂ was obtained.