Operando Study of the Active Phase in Liquid GaPt Alloy Catalysts

Moritz M, Wichmann C, Steinmetz M, Steinrück HP, Papp C (2025)

Publication Type: Journal article

Publication year: 2025

Journal

Small Science Wiley-VCH GmbH

DOI: 10.1002/smsc.202500423

Abstract

The operando study investigates propane dehydrogenation (PDH) using a liquid gallium-platinum catalyst based on the supported catalytically active liquid metal solutions (SCALMS) concept. The focus is on monitoring and analyzing the active phase during reaction using near-ambient pressure X-ray photoelectron spectroscopy (NAPXPS) combined with gas phase analysis. This approach proves practical in tracking surface changes and chemical states during catalytic reactions, providing real-time insights into the catalyst behavior. PDH, an industrially significant reaction, is investigated using a GaPt SCALMS with 1 at.% Pt content. The findings reveal that metallic liquid GaPt SCALMS exhibit high activity, while the presence of oxygen in the feed stream significantly lowers the activity of the catalyst. While current liquid metal catalysts often experience an activation period, a pathway to achieving stable conversion rates right after the start is demonstrated. This stability lays a foundation for developing next-generation catalysts with improved performance. The investigation also highlights the critical influence of oxidic Ga on catalytic activity, offering valuable guidance for optimizing catalyst design. Overall, the findings underscore the practical importance of NAPXPS in advancing the understanding of surface properties in catalytic systems.

Authors with CRIS profile

Michael Moritz Lehrstuhl für Physikalische Chemie II Christoph Wichmann Lehrstuhl für Physikalische Chemie II Hans-Peter Steinrück Lehrstuhl für Physikalische Chemie II

Involved external institutions

Freie Universität Berlin DE Germany (DE)

How to cite

APA:

Moritz, M., Wichmann, C., Steinmetz, M., Steinrück, H.-P., & Papp, C. (2025). Operando Study of the Active Phase in Liquid GaPt Alloy Catalysts. Small Science. https://doi.org/10.1002/smsc.202500423

MLA:

Moritz, Michael, et al. "Operando Study of the Active Phase in Liquid GaPt Alloy Catalysts." Small Science (2025).

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