The mechanism of the CO oxidation over polycrystalline platinum.

概要

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The kinetics of the CO oxidation has been studied on polycrystalline platinum at various partial pressures, total pressures, and temperatures; 0.1<Pco⁄Po2<5, 10−6<P<10−3 Pa, and 300<T<900K. The reaction was first-order in CO and zero-order in O2 for low pressures of CO, while it was inhibited by CO above a certain critical CO pressure, which increased with an increase in the O2 pressure and temperature. Above that CO pressure, the reaction was first-order in O2 and negative-order in CO. The amount of CO adsorbed was determined during the reaction with a flash-desorption technique. Above the critical CO pressure it was almost equal to that determined in the CO/Pt equilibrium system. It decreased sharply around the CO pressure and was very small at lower pressures. The kinetic behavior can be explained in terms of a Langmuir-Hinshelwood process and a change in the rate-limiting step.
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