期刊
SURFACE SCIENCE
卷 482, 期 -, 页码 243-249出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0039-6028(01)00739-7
关键词
catalysis; stepped single crystal surfaces; copper; alkali metals; carbon monoxide; synchrotron radiation photoelectron spectroscopy
Using valence band photoelectron spectroscopy it is demonstrated that CO dissociates on the potassium-modified stepped copper surfaces, Cu(1 1 2) and Cu(1 1 7). The dissociation process is conditioned by both the presence of steps and an alkali metal coverage above a certain threshold value. Carbonate is formed at 375 K via the process CO + CO --> CO2 + C and reaction with oxygen. Further heating to 600 K results in decomposition of the carbonate. The threshold alkali metal coverage for dissociation of CO on stepped copper surfaces depends on the step density. It is found that the height of the Fermi edge in the valence band photoelectron spectra is correlated with the CO uptake for a given potassium coverage and the perturbation and dissociation of the CO molecule with increasing temperature. (C) 2001 Elsevier Science B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据