Chemisorption of carbon atoms

The chemisorption of an atom or a molecule often induces rearrangement of the substrate atoms around the adsorption site. For example, the chemisorption of carbon atoms on the nickel (100) surface occurs at the fourfold site. The nearest-neighbor nickel atoms are displaced away from the carbon, permitting it to move more into the metal surface and bond to the metal atom in the second layer [5, 6]. A small in-plane rotation of the surface nickel atoms around the carbon, shown in Figure... 

According to step (b), the chemisorption of carbon atoms decomposed from the carbonaceous gases leads to carbon diffusion into the metal, i.e. initiation of metal dusting. This means that metal dusting may be prevented if the reaction between CO and metals is suppressed at their smface. 

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