Fig. 4: Effects on adsorbates of temperature and pressure.
From: Operando probing of the surface chemistry during the Haber–Bosch process
The steady-state population of the N species on the surface is shown for each catalyst at 200 mbar and 500 mbar at 523 K and 673 K in a 1:3 N2:H2 gas mixture. Each set of spectra is normalized and corrected for the cross-section of the corresponding metal substrate. a–c, The data over Fe(110), Fe(210) and \({\rm{Ru}}(10\bar{1}3)\) at 523 K, respectively. d, The data over Fe(210) at 673 K and at 1 bar. e–g, The data over Fe(110), Fe(210) and \({\rm{Ru}}(10\bar{1}3)\) at 673 K, respectively. Note the change in scale owing to the Ru data in c and g; nitrogen coverage of N species on the Ru surface is incredibly low.
