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

TY - JOUR

T1 - Thermal Imaging of Breathing Patterns during CO Oxidation on a Pd/Glass Cloth

AU - Digilov, R.

AU - Nekhamkina, O.

AU - Sheintuch, M.

PY - 2004/1

Y1 - 2004/1

N2 - 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.

AB - 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.

KW - CO oxidation

KW - Glass fiber support

KW - Heterogeneous catalysis

KW - IR thermography

KW - Spatiotemporal patterns

UR - http://www.scopus.com/inward/record.url?scp=1042291201&partnerID=8YFLogxK

U2 - 10.1002/aic.10015

DO - 10.1002/aic.10015

M3 - 文章

AN - SCOPUS:1042291201

SN - 0001-1541

VL - 50

SP - 163

EP - 172

JO - AICHE Journal

JF - AICHE Journal

IS - 1

ER -