Abstract
The catalytic oxidation of ammonia on a PtRh gauze has been studied in the presence and in the absence of oxygen atoms in the gas phase in order to ascertain whether the presence of gaseous atomic species can affect the kinetics of a heterogeneous catalytic process. The catalytic oxidation has been studied in the temperature region between 350 ° and 750 °K at pressures of the order of 1 Torr. The kinetics of the process is diffusional; NO and H 2O were practically the only oxidation products. The presence of oxygen atoms in the gas phase significantly lowers the activation energy of the catalytic process. Small activation energies are compensated by correspondingly small pre-exponential factors.
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