Influence of steps on the adsorption and thermal evolution of SO2 on clean and oxygen precovered Pt surfaces

Streber R, Papp C, Lorenz MPA, Höfert O, Zhao W, Wickert S, Darlatt E, Bayer A, Denecke R, Steinrück HP (2010)

Publication Type: Journal article

Publication year: 2010

Journal

Original Authors: Streber R., Papp C., Lorenz M.P.A., Höfert O., Zhao W., Wickert S., Darlatt E., Bayer A., Denecke R., Steinrück H.-P.

Publisher: American Chemical Society

Book Volume: 114

Pages Range: 19734-19743

Journal Issue: 46

DOI: 10.1021/jp105994f

Abstract

We investigated the adsorption and reaction of SO on clean and oxygen precovered, flat, and regularly stepped Pt surfaces, Pt(111), Pt(322), and Pt(355) by in situ high resolution X-ray photoelectron spectroscopy. Induced by the steps and/or the coadsorbed oxygen, several new SO species are observed, in addition to the two known SO species on Pt(111). On all investigated surfaces, a hit and stick mechanism is found for the adsorption, and no diffusion from terrace to step sites occurs at low temperatures. For the oxygen free stepped surfaces, a higher reactivity toward SO dissociation/disproportionation is found compared to Pt(111). On all three oxygen precovered Pt surfaces some SO is already formed directly upon SO exposure at low temperatures. Heating of this mixed O/SO layers first results in oxidation of more SO to SO, and at higher temperatures in subsequent oxidation of SO to SO, which finally decomposes above 450 K. The different reactions show a significant influence of the steps. © 2010 American Chemical Society.

Authors with CRIS profile

Additional Organisation(s)

Involved external institutions

Universität Leipzig Germany (DE)

How to cite

APA:

Streber, R., Papp, C., Lorenz, M.P.A., Höfert, O., Zhao, W., Wickert, S.,... Steinrück, H.-P. (2010). Influence of steps on the adsorption and thermal evolution of SO2 on clean and oxygen precovered Pt surfaces. Journal of Physical Chemistry C, 114(46), 19734-19743. https://dx.doi.org/10.1021/jp105994f

MLA:

Streber, Regine, et al. "Influence of steps on the adsorption and thermal evolution of SO2 on clean and oxygen precovered Pt surfaces." Journal of Physical Chemistry C 114.46 (2010): 19734-19743.

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