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Abstract:
Gas phase coupling between two separate (110)-oriented palladium single crystals is reported during reaction rate oscillations of CO oxidation. The oscillations were monitored by simultaneous measurement of work function changes on each crystal and of the combined CO2 production rates. With the onset of the oscillations, synchronization between the two samples occurred rapidly via the gas phase. Under strong coupling conditions and identical sample temperatures, both surfaces exhibited identical amplitudes and frequencies. Variation of the coupling intensity led to phase locking, entrainment, bead formation, composed oscillations and enhancement. The communication between the two crystals occurs entirely via the CO pressure. The coupled crystals system can serve as a model for the study of the dynamics of coupling in heterogeneous reactions as well as in oscillating reactions generally.
