title: Efficient hydrogenation over single-site bimetallic RuSn clusters.
abstract: Hydrogenation of ethene to ethane over single-site RuN and (RuSn)N clusters is investigated using Density Functional Theory calculations. The critical transition state barrier, namely the last hydrogenation step, correlates linearly for RuN with the adsorption energies of the reactants. Addition of Sn to the Ru-clusters breaks this relation and allows for lower reaction barriers. In general, Sn is found to have pronounced effects on the geometrical and electronic properties of RuN clusters with N≤ 12. RuN clusters preferably adopt cubic conformations with high spin states, whereas (RuSn)N have low spin states and form compact Ru cores capped with Sn atoms.
authors.affiliation: Department of Applied Physics and Competence Centre for Catalysis, Chalmers University of Technology, Göteborg, Sweden. lauroo@chalmers.se
authors.forename: Lauro Oliver
authors.initials: LO
authors.lastname: Paz-Borbón
authors.forename: Anders
authors.initials: A
authors.lastname: Hellman
authors.forename: John Meurig
authors.initials: JM
authors.lastname: Thomas
authors.forename: Henrik
authors.initials: H
authors.lastname: Grönbeck