THE OXIDATION OF CO OVER RU(001) AT HIGH-PRESSURES - CO RESIDENCE TIMES AND REACTION-MECHANISM

被引：12
|
作者：
HOFFMANN, FM [1 ]
WEISEL, MW [1 ]
PEDEN, CHF [1 ]
机构：
[1] SANDIA NATL LABS,ALBUQUERQUE,NM 87185
来源：
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA | 1990年 / 54卷
基金：
美国能源部;
关键词：
D O I：
10.1016/0368-2048(90)80270-K
中图分类号：
O433 [光谱学];
学科分类号：
0703 ; 070302 ;
摘要：
In order to elucidate the unusual catalytic behavior of ruthenium in the oxidation of CO, we have studied this reaction on a Ru(001) single crystal surface at high pressures with in-situ Fourier Transform-Infrared Reflection Absorption Spectroscopy (FT-IRAS). From the measurement of the steady-state surface coverages we are able to obtain estimates of mean residence times of the reactants. Under highly oxidizing conditions, where an O-(1 x 1) layer is present at the surface and the CO2 formation rate exhibits a maximum, we find CO residence times in the order of 10(-12) s. This suggests that the oxidation of CO may occur by direct reaction between gas-phase CO and chemisorbed oxygen atoms.
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页码：779 / 786
页数：8
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