ADSORPTION AND DISSOCIATION OF CO ON RH(210)

被引:53
作者
REBHOLZ, M
PRINS, R
KRUSE, N
机构
[1] Technisch Chemisches Laboratorium, E.T.H. Zürich
关键词
D O I
10.1016/0039-6028(91)90554-6
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
Adsorption, desorption and decomposition of carbon monoxide on a Rh(210) surface have been investigated in the temperature range between 300 and 1100 K by combined temperature programmed static secondary ion mass spectrometry (TPSSIMS), X-ray photoelectron spectroscopy (XPS) and temperature programmed desorption (TPD). Following adsorption of CO at 300 K three different molecular binding states, alpha-1, alpha-2 and alpha-3, are formed and identified through TPD. Partial decomposition of CO(ad) takes place during heating. C(ad) and O(ad) build-up have been followed by monitoring the relative SIGMA-(n)Rh(n)X+/Rh(n)+ (n = 1, 2; X = O, C) cluster ion intensities in (TP)SSIMS. At higher temperatures, i.e., above 500 K, C(ad) and O(ad) recombine as evidenced by the occurrence of a beta-CO feature in TPD. This process is associated with a decrease of the SIGMA-(n)Rh(n)X+/Rh(n)+ ratios. Further support for partial CO decomposition on Rh(210) is obtained from XPS. Carbon and oxygen show up in C 1s and O 1s features at 283.7 and 530.1 eV, respectively. Their intensities are about 10% of those found for a saturated CO layer at 300 K. Only the alpha-3 state seems to be implicated in the decomposition process as low exposures to CO, for which only the alpha-3 state is occupied, lead to the same amount of carbon and oxygen as high exposures.
引用
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页码:L797 / L803
页数:7
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