Abstract
The rate of displacement of adsorbed nitrogen under the adsorption equilibrium over a doubly promoted iron catalyst was determined at 250 and 350 ° C by means of isotopic nitrogen, and compared with the rate of isotopic exchange of nitrogen molecule. Although the rate of displacement is not uniform with respect to the adsorbed nitrogen, the highest rate of displacement is in agreement with the rate of isotopic mixing. It is accordingly concluded that the adsorbed nitrogen is mostly dissociated. A remarkable acceleration of the isotopic exchange is observed in the presence of hydrogen, and a normal isotope effect of 1.07 is determined for the acceleration by hydrogen. It is accordingly concluded that the acceleration effect is chemical in nature and that the promoter K 2O is responsible for the acceleration by hydrogen as well as for the increase in the rate of isotopic exchange in the absence of hydrogen.
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