Publication: Different reactivity of the various platinum oxides and chemisorbed oxygen in co oxidation on pt(111)
Program
KU-Authors
KU Authors
Co-Authors
Miller, Daniel
Casalongue, Hernan Sanchez
Bluhm, Hendrik
Ogasawara, Hirohito
Nilsson, Anders
Advisor
Publication Date
2014
Language
English
Type
Journal Article
Journal Title
Journal ISSN
Volume Title
Abstract
We have used X-ray photoelectron spectroscopy and polarization-resolved 0 K-edge X-ray absorption spectroscopy to investigate the reactivity of various oxygen covered Pt(111) surfaces, which emerge under high temperature and pressure conditions, toward CO. We find that the reactivity of the O/Pt(111) system decreases monotonically with increasing oxygen coverage. of the three surface oxygen phases, viz., chemisorbed oxygen (O-ad), a PtO-like surface oxide, and alpha-PtO2 trilayers, O-ad exhibits the highest reactivity toward CO, whereas alpha-PtO2 trilayers exhibit the lowest. Pt(111) surfaces fully terminated by alpha-PtO2 trilayers are inert to CO. Here it is proposed that the reactive phase is either O-ad or PtO-like surface oxide phase on bare non-CO poisoned Pt regions with PtO2 as majority spectator species.
Description
Source:
Journal of the American Chemical Society
Publisher:
American Chemical Society (ACS)
Keywords:
Subject
Chemistry, Multidisciplinary