Temperature effects on alkali-promoted CO dissociation on Ni(111)

被引：16
|
作者：
Politano, A.
Formoso, V.
Chiarello, G. [1 ]
机构：
[1] Univ Calabria, Dipartimento Fis, I-87036 Arcavacata Di Rende, Cs, Italy
来源：
SURFACE SCIENCE | 2008年 / 602卷 / 12期
关键词：
electron energy loss spectroscopy (EELS); alkali metals; carbon monoxide;
D O I：
10.1016/j.susc.2008.04.015
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Temperature effects on the alkali-induced CO dissociation on Ni(111) were studied by high-resolution electron energy loss spectroscopy. Measurements showed that CO adsorption on an alkali-precovered Ni(111) surface is partially dissociative in a temperature range up to 400 K and completely dissociative for higher sample temperatures. Depending on temperature an alkali critical precoverage for CO dissociation was found to exist, in agreement with theoretical calculations. Moreover, loss measurements demonstrated that Na and CO desorption are non-concurrent, in contrast with results obtained using thermal desorption spectroscopy for similar systems. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：2096 / 2100
页数：5
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