STOCHASTIC RESONANCE IN CATALYTIC REDUCTION OF NO WITH CO ON PT(100)

This paper presents a stochastic resonance occurring in a chemical rea ction Pt(100)/NO+CO. The results were from numerical simulation of the nonlinear kinetic behavior of a three-variable reaction model obtaine d from the law of mass actions. The model exhibits a special region in the bifurcation scheme, where a stable node coexists with a stable li mit cycle. When one of the control parameters is perturbed by a weak, low frequency periodic signal riding on a suitable external noisy back ground, transitions between the steady state and oscillatory state may become regular unexpectedly, and signal to noise ratio is thus enhanc ed at the signal frequency in the Fourier transform power spectrum of the time series output. That refers to stochastic resonance, in which the noise may play a constructive role in the detection of weak signal s. The findings may suggest a new method to develop chemical sensitive devices in the field of applications. The paper also discusses the co nditions of occurrence of stochastic resonance, and studies the laws i t follows. (C) 1998 American Institute of Physics. [S0021-9606(98)7033 9-3].