Catalytically active states of Ru(0001) catalyst in CO oxidation reaction

被引：80

作者：

Blume, R

Hävecker, M

Zafeiratos, S

Teschner, D

Kleimenov, E

Knop-Gericke, A

Schlögl, R

Barinov, A

Dudin, P

Kiskinova, M

机构：

[1] Sincrotrone Trieste, I-34012 Trieste, Italy

[2] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany

来源：

JOURNAL OF CATALYSIS | 2006年 / 239卷 / 02期

关键词：

CO oxidation; Ru; high pressure XPS; catalytically active states;

D O I：

10.1016/j.jcat.2006.02.019

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：

Identifying the composition of the catalytically active state of metal catalysts under dynamic operating conditions is of particular importance for oxidation catalysis. Here we report new insights into the chemical identity of different catalytically active states formed on a Ru(0001) catalyst during CO oxidation at various reaction temperatures. The changes in the surface composition of the Ru catalyst and the CO2 yield under varying reaction conditions in the 10(-4)-10(-1) mbar pressure range were followed in situ by synchrotron-based high-pressure X-ray photoelectron spectroscopy and mass spectroscopy. The results reveal that the catalytic activity of a few layers thick surface oxide without well-defined stoichiometry and structure is comparable with that of the stoichiometric RuO2(110) phase. This surface oxide forms under reaction conditions when RuO2 formation is kinetically hindered and can coexist with RuO2 in wide temperature and pressure ranges. (c) 2006 Elsevier Inc. All rights reserved.

引用

页码：354 / 361

页数：8

共 35 条

[1] Methanol oxidation on a copper catalyst investigated using in situ X-ray photoelectron spectroscopy [J].