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Different reactivity of the various platinum oxides and chemisorbed oxygen in co oxidation on pt(111)

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College of Sciences

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Miller, Daniel
Casalongue, Hernan Sanchez
Bluhm, Hendrik
Ogasawara, Hirohito
Nilsson, Anders

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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.

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American Chemical Society (ACS)

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Chemistry, Multidisciplinary

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Journal of the American Chemical Society

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DOI

10.1021/ja413125q

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