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Reaction kinetics for the oxygen hydrogenation process on Pt(111) derived from temperature-programmed XPS
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology. SLAC National Accelerator Lab, CA USA .
2013 (English)In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 618, 42-48 p.Article in journal (Refereed) Published
Abstract [en]

Oxygen hydrogenation under ultra high vacuum conditions at the platinum surface was explored using temperature-programmed X-ray photoelectron spectroscopy. Through modeling of the oxygen consumption, information on the reaction kinetics was obtained indicating that the reaction rate of the oxygen hydrogenation process depends on the hydrogen diffusion and on the lifetime of hydroxyl intermediates. The reaction rate is, however, enhanced when an autocatalytic process stabilizes the hydroxyl intermediates through hydrogen bonding to neighboring water molecules. The overall activation energy for the hydrogenation of atomic oxygen to form water was determined to be 0.20 eV with a frequency factor of only 10(3) s(-1).

Place, publisher, year, edition, pages
Elsevier , 2013. Vol. 618, 42-48 p.
Keyword [en]
Hydrogenation, Catalyst, Platinum, Reaction kinetics, Temperature-programmed, X-ray photoelectron spectroscopy
National Category
Medical and Health Sciences
URN: urn:nbn:se:liu:diva-102384DOI: 10.1016/j.susc.2013.08.018ISI: 000326614500008OAI: diva2:677434

Funding Agencies|Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering|DE-AC02-76SF00515|

Available from: 2013-12-09 Created: 2013-12-09 Last updated: 2013-12-09

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Näslund, Lars-Åke
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ReferencesLink to record
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