The knowledge of the different parameters determined by the model (NT, NS, NH, D (%), d (nm), and SM (m2gM−1)) for any value of m allows drawing correlations with the value of H/M (M corresponding to the chosen metal), the latter being accessible from a chemisorption experiment (Figure 3a–c). It can be seen that the evolution of dispersion, particle size, as well as metallic surface area, are clearly differing from one metal to another. The physical reason for these differences lies in the different adsorption sites between Pd, Rh, and Ir. For a convenient determination of D (%), d (nm), and SM (m2gM−1), a general fifth order polynomial trend line (with the R2 value equal to 1) is provided. The expression of dispersion, reciprocal particle size, and metallic surface area (see Table 1) are given below (Equations (8)–(10)), and are plotted as a function of H/M on Figure 3: (8)D(%)=aD×(HM)5+bD×(HM)4+cD×(HM)3+dD×(HM)2+eD×(HM) (9)1d (nm−1)=a1/d×(HM)5+b1/d×(HM)4+c1/d×(HM)3+d1/d×(HM)2+e1/d×(HM) (10)SM(m2gM−1)=aSM×(HM)5+bSM×(HM)4+cSM×(HM)3+dSM×(HM)2+eSM×(HM)