Abstract
Small (1.5 nm), medium size (4 nm), and large (30 nm) metallic iron particles jwere prepared on a magnesium oxide support. The turnover number, N, for the ammonia synthesis on these catalysts at atmospheric pressure between 570 and 700° K, was found to increase with particle size and with nitrogen-induced surface reconstruction for the small and medium-size particles. This latter effect was also accompanied by decreases in the surface-sensitive magnetic-anisotropy energy barrier and carbon monoxide chemisorption of the corresponding iron surfaces. It thus appears that small and medium-size particles are lacking in certain sites which are produced via the nitrogen-induced surface reconstruction, and all effects taken together indicate that these sites are C7 sites, i.e., surface atoms with seven nearest neighbors.
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