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The CO+O 2 reaction over Pt-group metals including the Langmuir-Hinshelwood mechanism of CO oxidation and metal oxide formation and removal is considered. Monte Carlo (MC) simulations for a small scale lattice-gas (LG) reaction model and mean-field (MF) equations are suggested to explain the oscillatory CO oxidation. Various scenarios for reaction rate oscillations simulated using the MC method...
At room temperature, the oxide formation on Al(111) starts on the boundaries of relatively large islands containing about or more than 20 chemisorbed oxygen atoms. We show that this special feature can be rationalized by assuming that the jump rate of oxygen atoms to the subsurface layer depends on lateral oxygen-oxygen interactions in the ground and activated states. In both cases, the lateral interaction...
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