title: CO2 hydrogenation on a metal hydride surface.
abstract: The catalytic hydrogenation of CO(2) at the surface of a metal hydride and the corresponding surface segregation were investigated. The surface processes on Mg(2)NiH(4) were analyzed by in situ X-ray photoelectron spectroscopy (XPS) combined with thermal desorption spectroscopy (TDS) and mass spectrometry (MS), and time-of-flight secondary ion mass spectrometry (ToF-SIMS). CO(2) hydrogenation on the hydride surface during hydrogen desorption was analyzed by catalytic activity measurement with a flow reactor, a gas chromatograph (GC) and MS. We conclude that for the CO(2) methanation reaction, the dissociation of H(2) molecules at the surface is not the rate controlling step but the dissociative adsorption of CO(2) molecules on the hydride surface.
authors.affiliation: Laboratory for Hydrogen & Energy, Dübendorf, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland.
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Kato
authors.forename: Andreas
authors.initials: A
authors.lastname: Borgschulte
authors.forename: Davide
authors.initials: D
authors.lastname: Ferri
authors.forename: Michael
authors.initials: M
authors.lastname: Bielmann
authors.forename: Jean-Claude
authors.initials: JC
authors.lastname: Crivello
authors.forename: Daniel
authors.initials: D
authors.lastname: Wiedenmann
authors.forename: Magdalena
authors.initials: M
authors.lastname: Parlinska-Wojtan
authors.forename: Peggy
authors.initials: P
authors.lastname: Rossbach
authors.forename: Ye
authors.initials: Y
authors.lastname: Lu
authors.forename: Arndt
authors.initials: A
authors.lastname: Remhof
authors.forename: Andreas
authors.initials: A
authors.lastname: Züttel
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry*; D002384:Catalysis; D006859:Hydrogen / Q000737:chemistry*; D006865:Hydrogenation; D008274:Magnesium / Q000737:chemistry*; D008697:Methane / Q000138:chemical synthesis* / Q000737:chemistry; D009532:Nickel / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties
chemical_list: D002245:Carbon Dioxide; D009532:Nickel; D006859:Hydrogen; D008274:Magnesium; D008697:Methane