Abstract
We have investigated the surface composition of a well-ordered Pt3Sn(111) surface during CO oxidation with ambient pressure X-ray photoemission spectroscopy. Oxidation of tin in the surface coincides with the onset of catalytic conversion, and we observe significant differences in the oxidation state and morphology of the oxide formed depending on the gas composition, with an oxygen-rich mixture leading to formation of 2D wetting layers and a CO-rich mixture leading to formation of 3D oxide islands. Spontaneous oscillations in conversion are observed at 300 °C in the oxygen-rich gas mixture and attributed to the combined effects of site blocking by tin oxides and by CO. The results highlight the importance of gas-surface interactions in determining the nature of oxides formed and thus the type and number of interfacial sites under reaction conditions.
| Original language | English |
|---|---|
| Pages (from-to) | 6258-6266 |
| Number of pages | 9 |
| Journal | Journal of Physical Chemistry C |
| Volume | 126 |
| Issue number | 14 |
| DOIs | |
| Publication status | Published - 14 Apr 2022 |
Bibliographical note
Funding Information:We acknowledge MAX IV Laboratory for time on Beamline HIPPIE under Proposal 20180341. Research conducted at MAX IV, a Swedish national user facility, is supported by the Swedish Research Council under Contract 2018-07152, the Swedish Governmental Agency for Innovation Systems under Contract 2018-04969, and Formas under Contract 2019-02496. We additionally thank beamline personnel Andrey Shavorskiy and Suyun Zhu for their help and support. Financing was provided by the Swedish Research Council through the Röntgen-Ångström collaboration “Catalysis on the atomic scale” Project 349-2011-6491, Project Grants 2018-05374 (L.R.M.) and 2017-04840 (J.K.), and the Knut and Alice Wallenberg (KAW) funded project “Atomistic design of new catalysts” Project KAW2015.0058. We also acknowledge the Faculty of Science at Lund University for strategic research support for research with neutrons and synchrotron radiation.
Funding
We acknowledge MAX IV Laboratory for time on Beamline HIPPIE under Proposal 20180341. Research conducted at MAX IV, a Swedish national user facility, is supported by the Swedish Research Council under Contract 2018-07152, the Swedish Governmental Agency for Innovation Systems under Contract 2018-04969, and Formas under Contract 2019-02496. We additionally thank beamline personnel Andrey Shavorskiy and Suyun Zhu for their help and support. Financing was provided by the Swedish Research Council through the Röntgen-Ångström collaboration “Catalysis on the atomic scale” Project 349-2011-6491, Project Grants 2018-05374 (L.R.M.) and 2017-04840 (J.K.), and the Knut and Alice Wallenberg (KAW) funded project “Atomistic design of new catalysts” Project KAW2015.0058. We also acknowledge the Faculty of Science at Lund University for strategic research support for research with neutrons and synchrotron radiation. We acknowledge MAX IV Laboratory for time on Beamline HIPPIE under Proposal 20180341. Research conducted at MAX IV, a Swedish national user facility, is supported by the Swedish Research Council under Contract 2018-07152, the Swedish Governmental Agency for Innovation Systems under Contract 2018-04969, and Formas under Contract 2019-02496. We additionally thank beamline personnel Andrey Shavorskiy and Suyun Zhu for their help and support. Financing was provided by the Swedish Research Council through the Ro?ntgen-?ngstro?m collaboration "Catalysis on the atomic scale" Project 349-2011-6491 Project Grants 2018-05374 (L.R.M.) and 2017-04840 (J.K.), and the Knut and Alice Wallenberg (KAW) funded project "Atomistic design of new catalysts" Project KAW2015.0058. We also acknowledge the Faculty of Science at Lund University for strategic research support for research with neutrons and synchrotron radiation.