Self-oscillations and surface waves during CO oxidation over Co
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The paper looks into the temporal and spatial dynamics of a new oscillating system comprised of CO oxidation over Co. Reaction rate oscillations occurring in CO excess were similar to the ones observed over Ni. The periodic variation of oxygen imbalance together with the variation in colour changes during the oscillations indicated that the oscillations were closely connected with the reversible oxidation of Co to various Co oxides. The periodic oxidation/reduction of cobalt proceeded as surface waves. Unexpectedly, widely varying spatial structures and wavefront velocities were detected during the heating and cooling branches under identical reaction conditions: regular self-oscillations transforming into a “surface turbulence” state.
KeywordsSelf-oscillations CO oxidation Co Spatiotemporal behavior Surface waves
This work was supported by the Russian Science Foundation (Grant No. 17-13-01057).
- 1.Ertl G (2000) Adv Catal 45:1Google Scholar
- 3.Slinko MM, Jaeger NI (1994) Oscillatory heterogeneous catalytic systems: studies in surface sciences and catalysis. Elsevier, AmsterdamGoogle Scholar
- 5.Imbihl R (2008) Non-linear dynamics in catalytic reactions. In: Hasselbrink E, Lundqvist BI (eds) Handbook of surface science. Elsevier, AmsterdamGoogle Scholar