CO Oxidation Over Monolayer Manganese Oxide Films on Pt(111)

被引：20

作者：

Martynova, Y. ^{[1
]}

Soldemo, M. ^{[2
]}

Weissenrieder, J. ^{[2
]}

Sachert, S. ^{[3
]}

Polzin, S. ^{[3
]}

Widdra, W. ^{[3
,4
]}

Shaikhutdinov, S. ^{[1
]}

Freund, H. -J. ^{[1
]}

机构：

[1] Fritz Haber Inst Max Planck Gesell, Chem Phys Abt, D-14195 Berlin, Germany

[2] KTH Royal Inst Technol, S-16440 Kista, Sweden

[3] Univ Halle Wittenberg, Inst Phys, D-06120 Halle, Germany

[4] Max Planck Inst Mikrostrukturphys, D-06120 Halle, Germany

来源：

CATALYSIS LETTERS | 2013年 / 143卷 / 11期

基金：

瑞典研究理事会;

关键词：

Ultrathin oxide films; Manganese oxide; CO oxidation; THIN-FILMS; SURFACES; GROWTH; METALS;

D O I：

10.1007/s10562-013-1117-0

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：

Ultrathin manganese oxide films grown on Pt(111) were examined in the low temperature CO oxidation reaction at near atmospheric pressures. Structural characterization was performed by X-ray photoelectron spectroscopy, Auger electron spectroscopy, high-resolution electron energy loss spectroscopy, and temperature programmed desorption. The results show that the reactivity of MnOx ultrathin films is governed by a weakly bonded oxygen species, which may even be formed at low oxygen pressures (similar to 10(-6) mbar). For stable catalytic performance at realistic conditions the films required highly oxidizing conditions (CO:O-2 < 1:10), otherwise the films dewetted, ultimately resulting in the catalyst deactivation. Comparison with other thin films on Pt(111) shows, that the desorption temperature of weakly bonded oxygen species can be used as a benchmark for its activity in this reaction.

引用

页码：1108 / 1115

页数：8

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