Studies on self-sustained reaction-rate oscillations. I. Real-time surface infrared measurements during oscillatory oxidation of carbon monoxide on platinum

Veronica Burrows, S. Sundaresan, Y. J. Chabal, S. B. Christman

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

Time-resolved infrared absorption features in the 1800-2400 cm-1 region during a typical cycle in the oscillatory oxidation of CO over a platinum foil were obtained by Fourier transform infrared reflection absorption spectroscopy. Pretreatment of the foil in an oxidizing environment at high temperatures was found to be necessary to induce large-amplitude, stable oscillations. The oscillations are approximately square-wave in shape, with a high and a low reaction-rate branch. The level of chemisorbed CO in the high reaction-rate branch is typically below the noise level, while in the low reaction-rate branch substantial substantial surface coverages of CO can be observed. No evidence for CO bridge-bonded to the platinum substrate or chemisorbed in the presence of a subsurface Pt oxide could be found at any time during the oscillation cycle. Evidence is presented for the existence of CO islands in the low reaction-rate branch. It is also shown that the low reaction rate realized in this branch is not due to blocking of the surface by chemisorbed CO.

Original languageEnglish (US)
Pages (from-to)122-138
Number of pages17
JournalSurface Science
Volume160
Issue number1
DOIs
StatePublished - Sep 1 1985
Externally publishedYes

Fingerprint

Carbon Monoxide
Platinum
Carbon monoxide
carbon monoxide
Reaction rates
reaction kinetics
platinum
Infrared radiation
Oxidation
oscillations
oxidation
Metal foil
foils
stable oscillations
cycles
infrared reflection
square waves
Infrared absorption
Absorption spectroscopy
pretreatment

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Studies on self-sustained reaction-rate oscillations. I. Real-time surface infrared measurements during oscillatory oxidation of carbon monoxide on platinum. / Burrows, Veronica; Sundaresan, S.; Chabal, Y. J.; Christman, S. B.

In: Surface Science, Vol. 160, No. 1, 01.09.1985, p. 122-138.

Research output: Contribution to journalArticle

Burrows, Veronica ; Sundaresan, S. ; Chabal, Y. J. ; Christman, S. B. / Studies on self-sustained reaction-rate oscillations. I. Real-time surface infrared measurements during oscillatory oxidation of carbon monoxide on platinum. In: Surface Science. 1985 ; Vol. 160, No. 1. pp. 122-138.
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