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

摘要

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 CO_2.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.