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Effect of Surface Impurities on Oscillation in NO+CO/Pt(100) Reaction System
Jin-jun Liu,Da-yin Hua*,Luo-luo Jiang
Author NameAffiliationE-mail
Jin-jun Liu Department of Physics, Ningbo University, Ningbo 315211, China  
Da-yin Hua* Department of Physics, Ningbo University, Ningbo 315211, China huadayin@nbu.edu.cn 
Luo-luo Jiang Department of Physics, Ningbo University, Ningbo 315211, China  
Abstract:
A lattice gas model was proposed to explore the effect of inert surface impurities on the oscillation in the NO+CO reaction system on Pt(100). It was found that when the fraction of the impurities is small, the (1*1) phase resulting from the surface restructuring can form a connected phase and the system exhibits a global sustained oscillation. With the fraction of the impurities increasing, the (1*1) phase only can form many isolated patches and the spatial coherence between the local oscillators with a random phase relationship lost, and as a result, the sustained oscillation changes into a damped one. When the diffusion rate of adsorbed CO and NO increases, the synchronization between local oscillators is enhanced and the global sustained oscillation can appear again.
Key words:  NO+CO/Pt(100) reaction system, Chemical oscillation, Heterogenous catalytic reaction, Monte Carlo method, Lattice gas model
FundProject:
表面杂质对NO+CO/Pt(100)反应体系振荡动力学的影响
刘进军,华达银,姜罗罗
摘要:
提出了一个格气模型, 探讨催化表面的惰性杂质对NO+CO/Pt(100)反应体系振荡动力学行为的影响.研究发现表面杂质较少时,反应进程中表面重构能够形成相连通的1*1相和持续的振荡行为.当表面杂质不断增加时,反应进程中1*1相只能形成许多孤立的畴,从而在1*1相形成的随机的局域振荡的空间关联被削弱,因而体系全局的持续振荡行为演变为衰减振荡行为.当表面吸附的CO和NO的扩散速率增加时,局域振荡的空间协同又得到加强,体系又呈现出持续振荡行为.
关键词:  NO+CO/Pt(100)反应体系, 化学振荡, 多相催化反应,Monte Carlo方法,格气模型
DOI:10.1088/1674-0068/20/03/279-284
分类号: