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Thermal imaging of breathing patterns during CO oxidation on a Pd/glass cloth
Author(s) -
Digilov R.,
Nekhamkina O.,
Sheintuch M.
Publication year - 2004
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.10015
Subject(s) - isothermal process , catalysis , thermography , thermal , phase (matter) , kinetic energy , infrared , relaxation (psychology) , chemistry , thermodynamics , analytical chemistry (journal) , materials science , optics , physics , chromatography , classical mechanics , psychology , social psychology , biochemistry , organic chemistry
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. © 2004 American Institute of Chemical Engineers AIChE J, 50: 163–172, 2004