Thermal Imaging of Breathing Patterns during CO Oxidation on a Pd/Glass Cloth

R. Digilov, O. Nekhamkina, M. Sheintuch*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


Infrared (IR) thermography studies of oscillatory behavior during catalytic oxidation of CO over Pd supported on a glass-fiber catalytic cloth were conducted in a continuous reactor with feed flowing perpendicular to and through the disk-shaped catalyst. Typical thermograms of sustained patterns exhibit a hot spot that expands and contracts continuously (a breathing pattern), in a temporal pattern that matched the oscillations in exit CO 2 concentration. The oscillations were of the complex relaxation type, with fast (1-min) oscillations superimposed on the active phase of the long (10-60-min) cycle. The change in the number of these smaller peaks, with a varying parameter, corresponds to a period-adding scenario. A model based on a published kinetic (isothermal) oscillator for this reaction, coupled with a solid-phase enthalpy and gas-phase mass balances, predicts these main features of the pattern. The novelty of these experimental results lies in the pattern, which is well defined and amenable to a systematic mathematical modeling, in the short period of the fast oscillations, as well as in the catalyst geometry, a disk-shaped cloth.

Original languageEnglish
Pages (from-to)163-172
Number of pages10
JournalAICHE Journal
Issue number1
StatePublished - Jan 2004
Externally publishedYes


  • CO oxidation
  • Glass fiber support
  • Heterogeneous catalysis
  • IR thermography
  • Spatiotemporal patterns


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