In situ X-ray photoelectron spectroscopy of catalytic ammonia oxidation over a Pt(533) surface

被引：35

作者：

Guenther, S. ^{[1
]}

Scheibe, A. ^{[2
]}

Bluhm, H. ^{[3
]}

Haevecker, M. ^{[3
]}

Kleimenov, E. ^{[3
]}

Knop-Gericke, A. ^{[3
]}

Schloegl, R. ^{[3
]}

Imbihl, R. ^{[2
]}

机构：

[1] Univ Munich, Dept Chem, D-80377 Munich, Germany

[2] Leibniz Univ Hannover, Inst Phys Chem & Elektrochem, D-30167 Hannover, Germany

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

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2008年 / 112卷 / 39期

关键词：

D O I：

10.1021/jp803264v

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 NH3 + O-2 reaction on a Pt(533) surface has been studied in the 10(-4) mbar range and close to 1 mbar pressure with in situ X-ray photoelectron spectroscopy using synchrotron radiation. The coverages of the various O- and N-containing surface species have been followed in T-cycling experiments with varying mixing ratios O-2/NH3 and varying total pressure. In heating/cooling cycles hysteresis of similar to 50-100 K width occur. Adsorbed NOad already decomposes at T > 350 K. Under stationary conditions, no adsorbed NO could be detected. At no time during the experiments were Pt bulk oxides formed. A shift in the surface core level component of the Pt 4f spectrum by more than 0.5 eV toward higher binding energy is attributed to Pt atoms of the (100) step edges which are coordinated to more than one oxygen atom similar to the model proposed by Wang et al.

引用

页码：15382 / 15393

页数：12

共 42 条

[41] Ammonia oxidation on Pt(410)
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[42] In situ high-resolution XPS studies on adsorption of NO on Pt(111)
Zhu, JF
Kinne, M
Fuhrmann, T
Denecke, R
Steinrück, HP
[J]. SURFACE SCIENCE, 2003, 529 (03) : 384 - 396

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