We investigate and discuss the catalytic reactivity of a transition metal M (M: Pt, Pd, Ni and Cu) atom on cyclohexane dehydrogenation by performing total energy calculations, based on the density functional theory. Total atomic charge investigation along the reaction path shows that in breaking a C-H bond of the cyclohexane, the σ donation dominates for a Pd and Cu atom as compared with a Pt atom, and the π back-donation dominates for a Ni atom as compared with a Pt atom. Our results indicate that the excess charge transfer causes more energy required for breaking the C -H bond of the cyclohexane with a Pd, Ni and Cu atom
