title: A tungsten-mediated closed cycle of reactivity for the reduction of CO(2) to CO.
abstract: The recycling of CO(2) by reduction to CO is an important objective in the context of renewable carbon feedstock chemicals. A tungsten-mediated reduction of CO(2) to CO reported by Mayer and coworkers has been re-examined, and it is shown that a series of four well-defined stoichiometric steps can be executed which form a closed cycle and sum as CO(2) + 2H(+) + 2e(-)→ CO + H(2)O. Energetic parameters of this system are probed by cyclic voltammetry, by calculations of gas-phase reaction enthalpies for each of the four steps, and by calculation of the W[triple bond, length as m-dash]O bond dissociation energy for the tungsten species that results from oxidation addition of CO(2).
authors.affiliation: Department of Chemistry, Tulane University, 6400 Freret Street, New Orleans, LA 70118-5698, USA.
authors.forename: Upul
authors.initials: U
authors.lastname: Jayarathne
authors.forename: Perumalreddy
authors.initials: P
authors.lastname: Chandrasekaran
authors.forename: Heiko
authors.initials: H
authors.lastname: Jacobsen
authors.forename: Joel T
authors.initials: JT
authors.lastname: Mague
authors.forename: James P
authors.initials: JP
authors.lastname: Donahue