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

Research output: Contribution to journal › Article › Research › peer review

Authors

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

Research Organisations

External Research Organisations

  • University of Rhode Island
  • Fritz Haber Institute of the Max Planck Society (FHI)
  • University of Illinois at Urbana-Champaign
  • Iowa State University
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Details

Original languageEnglish
Pages (from-to)162-170
Number of pages9
JournalSurface science
Volume407
Issue number1-3
Publication statusPublished - 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.

Keywords

    CO-oxidation, Pt(100), Reaction-diffusion fronts, Steps, Surface diffusion

ASJC Scopus subject areas

Cite this

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, Vol. 407, No. 1-3, 30.11.1998, p. 162-170.

Research output: Contribution to journal › Article › Research › 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, vol. 407, no. 1-3, pp. 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 ; Vol. 407, No. 1-3. pp. 162-170.
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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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