Tuning Strong Metal–Support Interaction Kinetics on Pt-Loaded TiO2(110) by Choosing the Pressure: A Combined Ultrahigh Vacuum/Near-Ambient Pressure XPS Study

Petzoldt, Philip; Eder, Moritz; Mackewicz, Sonia; Blum, Monika; Kratky, Tim; Günther, Sebastian; Tschurl, Martin; Heiz, Ueli; Lechner, Barbara A. J.

doi:10.1021/acs.jpcc.2c03851

Tuning Strong Metal–Support Interaction Kinetics on Pt-Loaded TiO₂(110) by Choosing the Pressure: A Combined Ultrahigh Vacuum/Near-Ambient Pressure XPS Study

Journal Article · Fri Sep 16 00:00:00 EDT 2022 · Journal of Physical Chemistry. C

DOI:https://doi.org/10.1021/acs.jpcc.2c03851· OSTI ID:1963050

Petzoldt, Philip ^[1]; Eder, Moritz ^[1]; ^[1]; ^[2]; ^[1]; ^[1]; ^[1]; ^[1]; ^[1]

Technical Univ. of Munich, Garching (Germany)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Pt catalyst particles on reducible oxide supports often change their activity significantly at elevated temperatures due to the strong metal–support interaction (SMSI), which induces the formation of an encapsulation layer around the noble metal particles. However, the impact of oxidizing and reducing treatments at elevated pressures on this encapsulation layer remains controversial, partly due to the “pressure gap” between surface science studies and applied catalysis. In the present work, we employ synchrotron-based near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) to study the effect of O₂ and H₂ on the SMSI-state of well-defined Pt/TiO₂(110) catalysts at pressures of up to 0.1 Torr. Further, by tuning the O₂ pressure, we can either selectively oxidize the TiO₂ support or both the support and the Pt particles. Catalyzed by metallic Pt, the encapsulating oxide overlayer grows rapidly in 1 × 10^–5 Torr O₂, but orders of magnitude less effectively at higher O₂ pressures, where Pt is in an oxidic state. While the oxidation/reduction of Pt particles is reversible, they remain embedded in the support once encapsulation has occurred.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Sponsoring Organization:: Deutsche Forschungsgemeinschaft (DFG); European Research Council (ERC); Fonds der Chemischen Industrie; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; Young Academy of Sciences and Humanities

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1963050

Journal Information:: Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 38 Vol. 126; ISSN 1932-7447

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Tuning Strong Metal–Support Interaction Kinetics on Pt-Loaded TiO2(110) by Choosing the Pressure: A Combined Ultrahigh Vacuum/Near-Ambient Pressure XPS Study

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Tuning Strong Metal–Support Interaction Kinetics on Pt-Loaded TiO₂(110) by Choosing the Pressure: A Combined Ultrahigh Vacuum/Near-Ambient Pressure XPS Study