title: First principles study of methane decomposition on B5 step-edge type site of Ru surface.
abstract: Many chemical reactions that produce a wide range of hydrocarbons and alcohols involve the breaking of C-H bonds in methane. In this paper, we analyzed the decomposition of this molecule on the B5 step-edge type site of Ru surface using first principles calculations based on dispersion-corrected density functional theory. Methane was found to be weakly adsorbed on the surface, characterized by the hybridization of its sp states with Ru-dxz,yz,zzstates. Dissociative adsorption is energetically preferred over molecular methane adsorption, resulting in CH fragment. CH is strongly adsorbed on the surface due to the prevalence of low-energy sp-d bonding interaction over the electron-unoccupied anti-bonding states. This highly stable CH requires higher activation barrier for C-H bond cleavage than CH4.
authors.affiliation: National Institute of Technology, Akashi College, 679-3 Nishioka, Uozumi, Akashi, Hyogo 674-8501, Japan.
authors.forename: Ryan Lacdao
authors.initials: RL
authors.lastname: Arevalo
authors.forename: Susan Meñez
authors.initials: SM
authors.lastname: Aspera
authors.forename: Mary Clare
authors.initials: MC
authors.lastname: Sison Escaño
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Nakanishi
authors.forename: Hideaki
authors.initials: H
authors.lastname: Kasai