Reaction hysteresis of the CO+O→CO2 reaction on palladium(111)

Karpitschka, Stefan; Wehner, Stefan; Küppers, Jürgen

Reaction hysteresis of the CO+O→CO2 reaction on palladium(111)

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Datum

2009

Autor:innen

Karpitschka, Stefan

Wehner, Stefan

Küppers, Jürgen

DOI (zitierfähiger Link)

https://doi.org/10.1063/1.3072712

Sammlungen

Physik

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

The Journal of Chemical Physics. AIP Publishing. 2009, 130(5), 054706. ISSN 0021-9606. eISSN 1089-7690. Available under: doi: 10.1063/1.3072712

Zusammenfassung

Rate measurements of the reaction CO+O→CO₂ on palladium(111) single crystal surfaces have been performed by means of mass spectroscopy under ultrahigh vacuum conditions. The total flux Φ of the impinging reactants CO and O₂ was held constant at 1 ML s⁻¹⁠, whereas its CO fraction Y was varied between 0 (pure O₂) and 1 (pure CO). The measurements have been performed for surface temperatures between 370 and 510 K and with a wide range of sampling times, evaluating the system parameter range for bistable behavior. Long-time measurements lasting several days proved the bistable behavior to result from two stable states rather than from slow processes not visible on usual experimental time scales. Pulselike modulations of the feed gas composition revealed the mechanisms confining the experimentally observed bistable range: the high CO fraction border of the bistability is given by the equistability condition of both states, whereas the other border is found to be associated with a saddle-node bifurcation in the corresponding system of reaction diffusion equations.

Fachgebiet (DDC)

530 Physik

Zitieren

ISO 690

KARPITSCHKA, Stefan, Stefan WEHNER, Jürgen KÜPPERS, 2009. Reaction hysteresis of the CO+O→CO2 reaction on palladium(111). In: The Journal of Chemical Physics. AIP Publishing. 2009, 130(5), 054706. ISSN 0021-9606. eISSN 1089-7690. Available under: doi: 10.1063/1.3072712

BibTex

@article{Karpitschka2009React-67028,
  year={2009},
  doi={10.1063/1.3072712},
  title={Reaction hysteresis of the CO+O→CO2 reaction on palladium(111)},
  number={5},
  volume={130},
  issn={0021-9606},
  journal={The Journal of Chemical Physics},
  author={Karpitschka, Stefan and Wehner, Stefan and Küppers, Jürgen},
  note={Article Number: 054706}
}

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