Chemical turbulence and standing waves in a surface reaction model: The influence of global coupling and wave instabilities

被引:100
作者
Baer, M. [1 ]
Hildebrand, M. [1 ]
Eiswirth, M. [1 ]
Falcke, M. [2 ]
Engel, H. [2 ]
Neufeld, M. [3 ]
机构
[1] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany
[2] TU Berlin, Inst Theoret Phys, AG Dissipat Strukturen, D-12489 Berlin, Germany
[3] Univ Stuttgart, Inst Theoret Phys, D-70550 Stuttgart, Germany
关键词
D O I
10.1063/1.166028
中图分类号
O29 [应用数学];
学科分类号
070104 ;
摘要
Among heterogeneously catalyzed chemical reactions, the CO oxidation on the Pt(110) surface under vacuum conditions offers probably the greatest wealth of spontaneous formation of spatial patterns. Spirals, fronts, and solitary pulses were detected at low surface temperatures (T<500 K), in line with the standard phenomenology of bistable, excitable, and oscillatory reaction-diffusion systems. At high temperatures (T>540 K), more surprising features like chemical turbulence and standing waves appeared in the experiments. Herein, we study a realistic reaction-diffusion model of this system, with respect to the latter phenomena. In particular, we deal both with the influence of global coupling through the gas phase on the oscillatory reaction and the possibility of wave instabilities under excitable conditions. Gas-phase coupling is shown to either synchronize the oscillations or to yield turbulence and standing structures. The latter findings are closely related to clustering in networks of coupled oscillators and indicate a dominance of the global gas-phase coupling over local coupling via surface diffusion. In the excitable regime wave instabilities in one and two dimensions have been discovered. In one dimension, pulses become unstable due to a vanishing of the refractory zone. In two dimensions, turbulence can also emerge due to spiral breakup, which results from a violation of the dispersion relation.
引用
收藏
页码:499 / 508
页数:10
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