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ChemInform Abstract conducted over a commercial Fe catalyst yields the first direct measurements of coverages in reactive intermediates of the working catalyst surface and assessments of the reaction mechanism and surface heterogeneity at steady-state reaction conditions. The most abundant reaction intermediate in the reaction, studied between 623 and 773 K at a total pressure of 204 or 513 kPa, and for a H2/N2 ratio of 3 is suggested to be *N. The line shapes of the transient data of this study lead to the conclusion that a single rate-limiting step exists in the synthesis pathway involving nitrogen and that hydrogen facilitates this step which involves N2 dissociation. The working catalyst surface is found to be kinetically nonuniform at the steady-state reaction conditions employed.

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