Mechanism Of Hydrogen Oxidation Research Articles

Kinetics and mechanism of hydrogen oxidation over lanthanum-cerium oxide catalyst using deuterium and oxygen-18

The kinetics of oxidation of stoichiometric mixtures of hydrogen and oxygen with different isotope compositions was studied on La 2O 3 doped with CeO 2 (ratio La Ce = 99 ) in the temperature range between 250 and 400 °C. It was found that during the oxidation the rate constant of H 2 + D 2 = 2HD exchange is equal to the rate of the oxidation under all experimental conditions. 16O 2 + 18O 2 = 2 16O 18O exchange and exchange of 18O between gas and catalyst did not occur during oxidation. The data obtained led to the conclusion that the limiting step of the oxidation reaction is the interaction between hydrogen in molecular form and adsorbed oxygen.

Kinetics of a hydrogen-air laminar flame

1. From the known constants of the elementary processes were calculated the velocities of the hydrogen-air flame, satisfactorily corresponding to the experimental data. 2. The effect of the main processes in the mechanism of hydrogen oxidation on the velocity of the flame was determined.

Electrode reactions of hydrazine in aqueous solutions

The oxidation of hydrazine in acid and alkaline media has been examined. On the basis of experimental evidence it is concluded that the oxidation of hydrazine is not primarily via a hydrogen oxidation mechanism, as has been previously suggested, but via a sequential oxidation of radicals (intermediates) derivable from hydrazine. It is furthermore concluded that the electrode surface characteristics affect the potential of oxidation, whilst the rest potential is controlled by subsequent formation of radicals.