Reaction-diffusion front propagation across stepped surfaces during catalytic oxidation of CO on Pt(100)

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Autoren

  • M. Tammaro
  • J. W. Evans
  • C. S. Rastomjee
  • W. Swiech
  • A. M. Bradshaw
  • R. Imbihl

Organisationseinheiten

Externe Organisationen

  • University of Rhode Island
  • Fritz-Haber-Institut der Max-Planck-Gesellschaft
  • University of Illinois Urbana-Champaign (UIUC)
  • Iowa State University
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Details

OriginalspracheEnglisch
Seiten (von - bis)162-170
Seitenumfang9
FachzeitschriftSurface science
Jahrgang407
Ausgabenummer1-3
PublikationsstatusVeröffentlicht - 30 Nov. 1998

Abstract

High-resolution microscopy studies of the removal of CO-adlayers on Pt(100) by exposure to oxygen reveal that reaction-diffusion front propagation is impeded both by mesoscopic step bunches and by monoatomic steps. The resulting "stop-and-go" nature to front propagation can be characterized in terms of a time delay for crossing each step bunch or step, at least when the separation of these defects is comparable to or exceeds the width of the front. Here, we quantify this time delay in terms of the reduced diffusion coefficient for CO in step bunch regions and the width of these regions, or in terms of the reduced hop rate for CO across monoatomic steps. We also briefly examine front propagation across arrays of more closely spaced steps. Results facilitate assessment of terrace diffusivities from average or macroscopic front propagation velocities across multiply stepped surfaces.

ASJC Scopus Sachgebiete

Zitieren

Reaction-diffusion front propagation across stepped surfaces during catalytic oxidation of CO on Pt(100). / Tammaro, M.; Evans, J. W.; Rastomjee, C. S. et al.
in: Surface science, Jahrgang 407, Nr. 1-3, 30.11.1998, S. 162-170.

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Tammaro, M, Evans, JW, Rastomjee, CS, Swiech, W, Bradshaw, AM & Imbihl, R 1998, 'Reaction-diffusion front propagation across stepped surfaces during catalytic oxidation of CO on Pt(100)', Surface science, Jg. 407, Nr. 1-3, S. 162-170. https://doi.org/10.1016/S0039-6028(98)00168-X
Tammaro, M., Evans, J. W., Rastomjee, C. S., Swiech, W., Bradshaw, A. M., & Imbihl, R. (1998). Reaction-diffusion front propagation across stepped surfaces during catalytic oxidation of CO on Pt(100). Surface science, 407(1-3), 162-170. https://doi.org/10.1016/S0039-6028(98)00168-X
Tammaro M, Evans JW, Rastomjee CS, Swiech W, Bradshaw AM, Imbihl R. Reaction-diffusion front propagation across stepped surfaces during catalytic oxidation of CO on Pt(100). Surface science. 1998 Nov 30;407(1-3):162-170. doi: 10.1016/S0039-6028(98)00168-X
Tammaro, M. ; Evans, J. W. ; Rastomjee, C. S. et al. / Reaction-diffusion front propagation across stepped surfaces during catalytic oxidation of CO on Pt(100). in: Surface science. 1998 ; Jahrgang 407, Nr. 1-3. S. 162-170.
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title = "Reaction-diffusion front propagation across stepped surfaces during catalytic oxidation of CO on Pt(100)",
abstract = "High-resolution microscopy studies of the removal of CO-adlayers on Pt(100) by exposure to oxygen reveal that reaction-diffusion front propagation is impeded both by mesoscopic step bunches and by monoatomic steps. The resulting {"}stop-and-go{"} nature to front propagation can be characterized in terms of a time delay for crossing each step bunch or step, at least when the separation of these defects is comparable to or exceeds the width of the front. Here, we quantify this time delay in terms of the reduced diffusion coefficient for CO in step bunch regions and the width of these regions, or in terms of the reduced hop rate for CO across monoatomic steps. We also briefly examine front propagation across arrays of more closely spaced steps. Results facilitate assessment of terrace diffusivities from average or macroscopic front propagation velocities across multiply stepped surfaces.",
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note = "Funding Information: The work of M.T. and J.W.E. was supported by the Division of Chemical Sciences, Basic Energy Sciences, USDOE. It was performed at Ames Laboratory, which is operated for the USDOE by Iowa State University under Contract No. W-7405-Eng-82.",
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T1 - Reaction-diffusion front propagation across stepped surfaces during catalytic oxidation of CO on Pt(100)

AU - Tammaro, M.

AU - Evans, J. W.

AU - Rastomjee, C. S.

AU - Swiech, W.

AU - Bradshaw, A. M.

AU - Imbihl, R.

N1 - Funding Information: The work of M.T. and J.W.E. was supported by the Division of Chemical Sciences, Basic Energy Sciences, USDOE. It was performed at Ames Laboratory, which is operated for the USDOE by Iowa State University under Contract No. W-7405-Eng-82.

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AB - High-resolution microscopy studies of the removal of CO-adlayers on Pt(100) by exposure to oxygen reveal that reaction-diffusion front propagation is impeded both by mesoscopic step bunches and by monoatomic steps. The resulting "stop-and-go" nature to front propagation can be characterized in terms of a time delay for crossing each step bunch or step, at least when the separation of these defects is comparable to or exceeds the width of the front. Here, we quantify this time delay in terms of the reduced diffusion coefficient for CO in step bunch regions and the width of these regions, or in terms of the reduced hop rate for CO across monoatomic steps. We also briefly examine front propagation across arrays of more closely spaced steps. Results facilitate assessment of terrace diffusivities from average or macroscopic front propagation velocities across multiply stepped surfaces.

KW - CO-oxidation

KW - Pt(100)

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KW - Surface diffusion

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