High pressure reaction methods have been combined with ultrahigh vacuum techniques to investigate the influence of low level Fe on the catalytic activity of the Ni(100) surface. CO dissociation and hydrocarbon formation from H2/CO mixtures are the specific reactions which have been considered. Reactivity changes observed in the presence of surface Fe can be attributed to the different local chemistry involved in CO–Fe and CO–Ni interactions.
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Semancik et al. (1982) studied this question.