The influence of surface metal composition of Fe-Cr alloys on dissociative 
adsorption of N2

Dowben, P.A.; Miller, A.; Ruppender, H.J.; Grunze, M.

doi:10.1016/0039-6028(88)90440-2

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The influence of surface metal composition of Fe-Cr alloys on dissociative adsorption of N2

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Grunze, M.
Cellular Biophysics, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Dowben, P., Miller, A., Ruppender, H., & Grunze, M. (1988). The influence of surface metal composition of Fe-Cr alloys on dissociative adsorption of N2. Surface Science, 193(3), 336-352. doi:10.1016/0039-6028(88)90440-2.

Cite as: https://hdl.handle.net/21.11116/0000-0001-892A-6

Abstract

We have investigated the dissociative adsorption of N2 on Cr(110) and Fe72Cr28(110) prepared under different conditions and compare the results with previously published studies of dissociative adsorption of N2 on Fe(110). Small concentrations of elemental iron at the surface reduces the probability of dissociative nitrogen adsorption. This decrease in N2 dissociation, by orders of magnitude, is observed despite the formation of a surface chromium nitride on the chromium-rich and chromium-poor surfaces of the Fe-Cr alloy. Since geometrical arguments considering the distribution of chromium clusters of sufficient size to dissociate an N2 molecule cannot explain the decrease in dissociation probability, we have concluded that the presence of iron decreases the chemical activity of the chromium for breaking the N2 bond through electronic structure effects.