Abstract
The decomposition of nitrous oxide on neodymium oxide, dysprosium oxide and erbium oxide has been studied in two pressure ranges of approximately 1 to 10 Torr and 10 to 100 Torr, over a temperature range of 400 to 600 °C. In all cases, the kinetics are first-order in nitrous oxide with a pseudo-rate constant varying with initial pressure. This effect is more noticeable at low pressures, with the pseudo-rate constant decreasing as the initial pressure of nitrous oxide is increased at a constant temperature. The results have been explained by assuming that the rate-determining step is the surface decomposition of nitrous oxide. Oxygen desorption is also an important rate-controlling step, particularly at high oxygen pressures. There is a reversible deactivation of a fraction of the initially active sites by adsorbed oxygen formed from the nitrous oxide. This deactivation is dependent upon initial pressure.
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