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Conclusions on the Mechanism of Ammonia-Synthesis from the Kinetics of Nitrogenation and Denitrogenation of Iron

are presented. The segregation and adsorption equilibrium is derived for adsorbed nitrogen atoms ß, which participate in reaction (2) but not in reaction (1). By experiments on samples of different surface roughness, it was shown that both reactions occur on the same faces or the same structural components of the iron surface. The nitrogen dissociation, rate determining in reaction (2), presumably takes place in vacancies of a chemisorption structure, formed by TV^-atoms in interstitial sites of the topmost iron layer, whereas the dehydrogenation-hydrogénation steps of reaction (1) occur on the outer surface.