CO oxidation reaction over oxygen-rich Ru(0001) surfaces

被引:149
作者
Böttcher, A
Niehus, H
Schwegmann, S
Over, H
Ertl, G
机构
[1] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany
[2] Humboldt Univ, Inst Phys Oberflachenphys & Atomstossprozesse, D-10115 Berlin, Germany
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 1997年 / 101卷 / 51期
关键词
D O I
10.1021/jp9726899
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
The formation of CO2, by exposing oxygen precovered Ru(0001) surfaces to CO, was investigated as a function of the oxygen coverage for sample temperatures up to 900 K. It turned out that the reaction probability per incident CO molecule is below 5 x 10(-4) for O coverages up to 3 monolayers (ML); oxygen in excess of 1 ML is located in the subsurface region. The reaction probability for the (1 x 1)-10 phase is in agreement with the data derived from high-pressure experiments by Peden and Goodman [J. Phys. Chem. 1986, 90, 1360]. Even for CO molecules with a translational energy of 1.2 eV (supersonic molecular beam experiments), the reaction probability is less than 5 x10(-2). This value is consistent with the activation barrier derived from DFT calculations for a reaction by direct collision from the gas phase (Eley-Rideal mechanism). Beyond an oxygen load of 3 ML, however, the reaction probability increases by 2 orders of magnitude. It is suggested that this enhancement is due to a further destabilization of the surface oxygen by the onset of oxide formation.
引用
收藏
页码:11185 / 11191
页数:7
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