Quite recently, a link between the adsorption mode and the behaviour of the cluster was proposed. More precisely, we distinguish two adsorption modes of the NO molecule on metallic surfaces which can be either dissociative or non

dissociative (Its knowledge may come from surface science). Regarding the metallic cluster, (1) it can be stable versus this adsorption, (2) a sintering process of the metallic cluster can occur or (3) a disruption of the metal-metal bonds in response

to this adsorption can be observed.

It is quite exciting that such link may explain the behaviour of bimetallic catalysts. A possible approach is to consider a straight line between platinum and rhodium on the diagram proposed for monometallic systems (see publication attached).

In the Pt rich region, the behaviour of PtRh bimetallic clusters will be similar to the Pt monometallic system whereas, in the Rh rich region, their behaviour will be similar

to the Rh monometallic system.If we consider now the experimental result obtained on the 1% Pt-1% Rh bimetallic system, we see that this result is in line with the conclusion

obtained with this simple approach. In fact, the catalytic activity of other bimetallic systems can be explained by this very simple relationship.

Does somebody find a publication not in line with this simple model ?