SOME KINETIC ASPECTS OF UNSTEADY-STATE PARTIAL OXIDATION REACTIONS - DYNAMIC PROCESSES ON METAL-OXIDE SURFACES

It is shown that steady-state kinetic data do not allow the discrimina tion between the redox and associated mechanisms of the partial oxidat ion reactions. A discrimination between these mechanisms was performed using transient experiments. The obtained rate expressions are in agr eement with experimental kinetic data for catalytic partial oxidation of o-xylene. An influence of the conjugate oxidation of a catalyst sur face on dynamics and kinetics of the heterogeneous catalytic oxidative reactions is considered. Computing simulation of methane oxidative co upling of methane reaction at lowered temperature and elevated pressur e has been performed. It showed that the reaction order with respect t o oxygen exceeding unity is consistent with the chain branching mechan ism of the reaction in the presence of TiSi2 and TiB2 and showed the i mportant role of the branching chain cycles in the low-temperature OCM reaction at elevated pressure.