The use of the hydrogen-oxygen reaction in evaluating velocity constants

Studies of the H2/O2 reaction have given information on some of the reactions of the radicals H, O, OH, and HO2 with hydrocarbons, CO, and H2O2 in the region of 500°C. The inhibiting action of hydrocarbons on the second limit has given Arrhenius parameters for H+RH in the case of ethane, propane, n- and i-butane. More restricted information on the reaction of O and OH with these hydrocarbons is also obtained. Studies of the yields of CO2 and H2O in slowly reacting H2/CO/O2 mixtures enables the ratios kOH+CO/kOH+H2 and kHO2+CO/kHO2+H2 to be evaluated. Studies of the decomposition of H2O2 sensitized by H2 give the relative rates of OH+H2 and OH+H2O2, as well as the ratio of the rates of H+H2O2=H2O+OH and H+H2O2=H2+HO2. Study of the reduction of this sensitising effect by traces of added O2 enables the ratio of the rates H+H2O2=H2+HO2 and H+O2+M=HO2+M to be determined.

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