Abstract
The kinectic parameters were measured for the catalytic decomposition of nitrous oxide on ZnO powder between 40 and 60 kPa and the temperature range 725−835 K. Under studied conditions the reaction was found to be first order in N2O. An Arrhenius fit to the rate constants results in an apparent activation energy of 120 ± 4 kJ mol-1. Only the temperature-dependent nitrogen kinetic isotope effects were experimentally obtained, while the oxygen kinetic isotope effects were perturbed by 18O exchanged between N2O and ZnO. Theoretical interpretation of KIEs was evaluated according to Bigeleisen's formalism. From comparison of calculated results with the experimental data both a cis ONNO and a fork-type NNOO models are acceptable as transition state of the reaction.
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