The silver-oxygen system in catalysis: new insights by near ambient pressure X-ray photoelectron spectroscopy

被引：130
|
作者：
Rocha, Tulio C. R. [1 ]
Oestereich, Andreas [1 ]
Demidov, Demid V. [1 ,2 ]
Haevecker, Michael [1 ]
Zafeiratos, Spiros [3 ]
Weinberg, Gisela [1 ]
Bukhtiyarov, Valerii I. [2 ]
Knop-Gericke, Axel [1 ]
Schloegl, Robert [1 ]
机构：
[1] Max Planck Gesell, Fritz Haber Inst, Dept Inorgan Chem, D-14195 Berlin, Germany
[2] Boreskov Inst Catalysis, Novosibirsk 630090, Russia
[3] Univ Strasbourg, Lab LMSPC, CNRS, UMR7515, F-67087 Strasbourg 2, France
来源：
PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2012年 / 14卷 / 13期
关键词：
ELECTRONIC-STRUCTURE; ETHYLENE EPOXIDATION; SUBSURFACE OXYGEN; PARTIAL OXIDATION; HIGH-TEMPERATURE; ADSORPTION; SURFACE; AG(111); XPS; MECHANISM;
D O I：
10.1039/c2cp22472k
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：
We addressed the interaction of oxygen with silver by synchrotron based near ambient pressure X-ray photoelectron spectroscopy at temperatures relevant for industrial oxidation reactions performed with silver catalysts. For silver single crystals, polycrystalline foils and powders in equilibrium with gas phase O-2, we observed the dynamics of the formation of five different atomic oxygen species with relative abundances depending on the temperature and time. Correlation of their formation kinetics with spectroscopic features and thermal stability indicates that these are distinct species with different electronic structures, which might relate to the different roles of silver in oxidation reactions.
引用
收藏
页码：4554 / 4564
页数：11
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