2024-03-29T09:12:17Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/186392019-02-27T11:33:09Zcom_10261_2855com_10261_4col_10261_2857
External noise-induced phenomena in CO oxidation on single crystal surfaces
Pineda, Miguel
Toral, Raúl
Carbon compounds
Catalysis
Iridium
Oxidation
Platinum
Reaction kinetics theory
Reduction (chemical)
Stochastic systems
7 pages, 6 figures.-- PACS 81.65.Mq, 82.65.+r, 82.20.-w, 82.30.-b
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 Pt group metal surfaces, are analyzed. The noise is superposed on the fraction of CO in the constant gas flow directed at the surfaces 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.
We acknowledge the financial support of Project
No. FIS2007-60327 from MICINN (Spain) and FEDER
(EU)
Peer reviewed
2009-11-16T07:35:06Z
2009-11-16T07:35:06Z
2009-03-24
artículo
http://purl.org/coar/resource_type/c_6501
Journal of Chemical Physics 130(12): 124704.1-124704.7 (2009)
0021-9606
http://hdl.handle.net/10261/18639
10.1063/1.3096989
1089-7690
en
http://dx.doi.org/10.1063/1.3096989
open
4920755 bytes
application/pdf
American Institute of Physics