Stroboscopic operando spectroscopy of the dynamics in heterogeneous catalysis by event-averaging

Jan Knudsen (), Tamires Gallo, Virgínia Boix, Marie Døvre Strømsheim, Giulio D’Acunto, Christopher Goodwin, Harald Wallander, Suyun Zhu, Markus Soldemo, Patrick Lömker, Filippo Cavalca, Mattia Scardamaglia, David Degerman, Anders Nilsson, Peter Amann, Andrey Shavorskiy and Joachim Schnadt
Additional contact information
Jan Knudsen: Lund University
Tamires Gallo: Lund University
Virgínia Boix: Lund University
Marie Døvre Strømsheim: Norwegian University of Science and Technology (NTNU)
Giulio D’Acunto: Lund University
Christopher Goodwin: Stockholm University
Harald Wallander: Lund University
Suyun Zhu: Lund University
Markus Soldemo: Stockholm University
Patrick Lömker: Deutsches Elektronen-Synchrotron DESY
Filippo Cavalca: Lund University
Mattia Scardamaglia: Lund University
David Degerman: Stockholm University
Anders Nilsson: Stockholm University
Peter Amann: Stockholm University
Andrey Shavorskiy: Lund University
Joachim Schnadt: Lund University

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Heterogeneous catalyst surfaces are dynamic entities that respond rapidly to changes in their local gas environment, and the dynamics of the response is a decisive factor for the catalysts’ action and activity. Few probes are able to map catalyst structure and local gas environment simultaneously under reaction conditions at the timescales of the dynamic changes. Here we use the CO oxidation reaction and a Pd(100) model catalyst to demonstrate how such studies can be performed by time-resolved ambient pressure photoelectron spectroscopy. Central elements of the method are cyclic gas pulsing and software-based event-averaging by image recognition of spectral features. A key finding is that at 3.2 mbar total pressure a metallic, predominantly CO-covered metallic surface turns highly active for a few seconds once the O2:CO ratio becomes high enough to lift the CO poisoning effect before mass transport limitations triggers formation of a √5 oxide.

Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-26372-y

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DOI: 10.1038/s41467-021-26372-y

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