Abstract
Rotating temperature pulses were observed during hydrogen oxidation on a nickel ring. Changes in the pulse amplitude and width (with angular position) caused oscillations in the global reaction rate. With time, the pulse motion transformed to homogeneous oscillations. However, for several weeks, the pulse motion could be restored by a proper start up. As the time-on-stream increased, domain oscillations prevailed in which pulses alternately formed at few catalyst locations. The average conversion attained when a rotating pulse existed was sometimes significantly higher than that for homogeneous oscillations under the same operating conditions. Increasing the gas-phase mixing in the vessel enhanced the formation and prolonged the life of the rotating pulses, indicating that global interaction stabilized this motion. The time-averaged local temperature rise as a function of angular position was similar for various qualitatively different patterns, indicating an underlying nonuniformity in the system.
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