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Charlas y Presentaciones

External noise-induced phenomena in nonlinear surface reactions

By Miguel Pineda and Raul Toral
XVI Workshop of Statistical Physics (FisEs09), Universidad de Huelva, Huelva, 10-12 de Septiembre de 2009 2009

The influence of external noise on minimalistic models for the catalytic CO oxidation on  Ir(111) and Pt(111) is studied by means of the adiabatic elimination  technique. Two models, which reproduce the bistable behavior  usually  observed in CO oxidation on noble metals, are analyzed. The noise is superposed on the fraction of CO in the constant gas flow directed at the surface and the resulting stochastic systems are reduced after the adiabatic elimination of oxygen coverage. This reduction  allows us to analyze theoretically the interplay between external noise and the kinetic bistability of CO oxidation. We report the phenomena of noise-induced shifts of steady states and noise-induced jumps between stable steady states. We also present evidence for noise-induced transitions from mono- to bistability. The theoretical results are compared with simulations of the original two-variable stochastic reaction systems