Real-time study of self-sustained oscillations in the CO oxidation rate on Pt

Veronica Burrows, S. Sundaresan

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The driving mechanism for self-sustained oscillations in the rate of some catalytic oxidations under steady-state conditions has remained unexplained despite numerous theoretical and experimental studies since the early 1970s. We have used reflection-absorption infrared spectroscopy to perform the first real-time analysis of a Pt foil surface during constant temperature oscillations in CO oxidation. The CO absorption capacity of the surface is shown to vary periodically during oscillations. Inverse correlation of the CO adsorption capacity with surface carbon concentration (measured with Auger spectroscopy) and demonstration that (1) carbon can diffuse from the bulk to the surface (2) oxygen can remove surface carbon from the surface, and (3) CO can block carbon diffusion all at oscillation temperatures indicate that variation in surface carbon concentration may bedriving the oscillations. Modeling of the phenomenon is found to account for all observations.

Original languageEnglish (US)
Pages (from-to)801-804
Number of pages4
JournalJournal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Volume5
Issue number4
DOIs
StatePublished - Jul 1 1987
Externally publishedYes

Fingerprint

Time and motion study
Carbon Monoxide
Oxidation
oscillations
oxidation
Carbon
carbon
Catalytic oxidation
Absorption spectroscopy
Metal foil
Auger spectroscopy
Infrared spectroscopy
foils
absorption spectroscopy
Demonstrations
infrared spectroscopy
Spectroscopy
Oxygen
Adsorption
Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

Real-time study of self-sustained oscillations in the CO oxidation rate on Pt. / Burrows, Veronica; Sundaresan, S.

In: Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films, Vol. 5, No. 4, 01.07.1987, p. 801-804.

Research output: Contribution to journalArticle

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