物理化学学报 >> 1985, Vol. 1 >> Issue (02): 154-161.doi: 10.3866/PKU.WHXB19850206

研究论文 上一篇    下一篇

从多重定态到化学振荡

吴小茂; 李如生   

  1. 清华大学化学与化学工程系
  • 收稿日期:1984-06-22 修回日期:1984-12-18 发布日期:1985-04-15

FROM MULTIPLE STEADY STATES TO CHEMICAL OSCILLATION

Wu Xiaomao; Li Rusheng   

  1. Department of Chemistry and Chemical Engineering Tsinghua University; Beijing
  • Received:1984-06-22 Revised:1984-12-18 Published:1985-04-15

摘要: 通过对化学反应体系动力学模型的分析, 论证了通过在多重定态体系中引入适当慢反馈步骤设计化学振荡体系的可能性, 提出了这类体系的动力学方程具有振荡解的判据以及在参数平面内划分振荡区域的方法。采用这种途径具体分析了一氧化碳在铂催化剂上氧化产生振荡现象的机理。

Abstract: So far, almost all systems which show chemical oscillation were discovered by chance.In this paper, we discuss the possibility of designing chemical oscillation by introducing a suitable slow feedback step to a system which shows multiple steady states. A criterion of existence of oscillation solution from kinetic equations for model system is given, and a method to identify the region of oscillation solu- tion in parameter space is proposed. With this method, the mechanism of oscilla- tion phenomena in the oxidation of carbon monoxide on Pt catalyst is analysed.
Experimentally, many chemical reacting systems show multiple steady states. A typical situation is shown in Fig.1, where x represents the value of state variable, λ the value of control parameter. The kinetics of the above system can be described by
dx/dt=f(x, λ) (1)
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