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Operando hysteresis of a palladium surface during high-frequency gas-pulsing of ethylene into oxygen

Küst, Ulrike LU orcid ; Eads, Calley LU orcid ; Prumbs, Julia LU ; Wang, Weijia LU ; Temperton, Robert LU ; Klyushin, Alexander LU ; Shavorskiy, Andrey LU and Knudsen, Jan LU orcid (2026) In Surface Science 766.
Abstract

Catalytic active phases are often separated from inactive ones by their appearance/removal in heating/cooling experiments. Such experiments can reveal ignition, extinction, and often an associated hysteresis. The corresponding behavior and hysteresis under rapid gas composition changes in the milliseconds regime remain largely unexplored. However, such experiments can potentially be highly rewarding as catalytic properties of surfaces that have not yet equilibrated to the gas phase can be studied. Here, we use time-resolved Ambient Pressure X-ray Photoelectron Spectroscopy (tr-APXPS) to study ethylene oxidation on polycrystalline Pd during modulation of the C2H4:O2 ratio. By combining 10 Hz gas pulsing... (More)

Catalytic active phases are often separated from inactive ones by their appearance/removal in heating/cooling experiments. Such experiments can reveal ignition, extinction, and often an associated hysteresis. The corresponding behavior and hysteresis under rapid gas composition changes in the milliseconds regime remain largely unexplored. However, such experiments can potentially be highly rewarding as catalytic properties of surfaces that have not yet equilibrated to the gas phase can be studied. Here, we use time-resolved Ambient Pressure X-ray Photoelectron Spectroscopy (tr-APXPS) to study ethylene oxidation on polycrystalline Pd during modulation of the C2H4:O2 ratio. By combining 10 Hz gas pulsing with 25 kHz spectral acquisition, we track both gas phase and surface chemistry under non-equilibrium conditions and reveal and discuss a pronounced hysteresis.

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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
APXPS, Fast, Gas-pulsing, Hysteresis, Time-resolved
in
Surface Science
volume
766
article number
122892
publisher
Elsevier
external identifiers
  • scopus:105023588096
ISSN
0039-6028
DOI
10.1016/j.susc.2025.122892
language
English
LU publication?
yes
id
8104e7ac-2a46-49f0-8b56-32c4421cce67
date added to LUP
2026-02-10 15:38:55
date last changed
2026-02-10 15:38:55
@article{8104e7ac-2a46-49f0-8b56-32c4421cce67,
  abstract     = {{<p>Catalytic active phases are often separated from inactive ones by their appearance/removal in heating/cooling experiments. Such experiments can reveal ignition, extinction, and often an associated hysteresis. The corresponding behavior and hysteresis under rapid gas composition changes in the milliseconds regime remain largely unexplored. However, such experiments can potentially be highly rewarding as catalytic properties of surfaces that have not yet equilibrated to the gas phase can be studied. Here, we use time-resolved Ambient Pressure X-ray Photoelectron Spectroscopy (tr-APXPS) to study ethylene oxidation on polycrystalline Pd during modulation of the C<sub>2</sub>H<sub>4</sub>:O<sub>2</sub> ratio. By combining 10 Hz gas pulsing with 25 kHz spectral acquisition, we track both gas phase and surface chemistry under non-equilibrium conditions and reveal and discuss a pronounced hysteresis.</p>}},
  author       = {{Küst, Ulrike and Eads, Calley and Prumbs, Julia and Wang, Weijia and Temperton, Robert and Klyushin, Alexander and Shavorskiy, Andrey and Knudsen, Jan}},
  issn         = {{0039-6028}},
  keywords     = {{APXPS; Fast; Gas-pulsing; Hysteresis; Time-resolved}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Surface Science}},
  title        = {{Operando hysteresis of a palladium surface during high-frequency gas-pulsing of ethylene into oxygen}},
  url          = {{http://dx.doi.org/10.1016/j.susc.2025.122892}},
  doi          = {{10.1016/j.susc.2025.122892}},
  volume       = {{766}},
  year         = {{2026}},
}