Analysis of excitable waves and spatio-temporal patterns in fixed-bed reactors

Dynamics of spatiotemporal thermal patterns during the catalytic CO oxidation over Pd supported on a glass-fiber catalytic cloth rolled into a tube of 20 mm diameter and 80 mm length has been studied in a continuous flow reactor by IR thermography. A specially designed aluminum mirror built in the reactor provided image of the entire surface of the horizontally held catalytic tube. With flow in the main axial direction and through the tube surface, we observed periodic motions of a pulse, which was born downstream and propagated upstream. The temperature pulse motion was accompanied by conversion oscillations of CO2. With flow in the main axial direction, parallel to the surface, we observed a stationary hot zone after an oscillatory transient. These patterns can be simulated with a plug-flow-reactor-like heterogeneous reactor model that incorporates previously determined kinetic and transport parameters.

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Catalytic spatiotemporal thermal patterns during CO oxidation on cylindrical surfaces: Experiments and simulations

Digilov

Nekhamkina

Sheintuch

2006

The Journal of Chemical Physics

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Pattern formation on a nonuniformly active ring

Liauw

Luss

1996

The Journal of Chemical Physics

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A rich variety of spatiotemporal patterns exists on reactive rings having a nonuniform activity. Simulations of a case with a nonuniformity indicate that when the local phase-plane features change along the ring, novel motions evolve which cannot form on a uniformly active ring. An example is a rotating pulse which can move only in one direction but not in the other. The nonuniformity increases the number of possible patterns which can exist on a specific ring relative to that existing on a uniformly active one. Thus the nonuniformity increases the sensitivity of the observed patterns to changes in the initial conditions or perturbations.

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Analysis of excitable waves and spatio-temporal patterns in fixed-bed reactors

Cited by 2 publications

References 5 publications

Catalytic spatiotemporal thermal patterns during CO oxidation on cylindrical surfaces: Experiments and simulations

Catalytic spatiotemporal thermal patterns during CO oxidation on cylindrical surfaces: Experiments and simulations

Pattern formation on a nonuniformly active ring

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