In Situ X-Ray Photoelectron Spectroscopy of Model Catalysts: At the Edge of the Gap

被引：103

作者：

Blomberg, S. ^{[1
]}

Hoffmann, M. J. ^{[2
]}

Gustafson, J. ^{[1
]}

Martin, N. M. ^{[1
]}

Fernandes, V. R. ^{[3
]}

Borg, A. ^{[3
]}

Liu, Z. ^{[4
]}

Chang, R. ^{[4
]}

Matera, S. ^{[2
]}

Reuter, K. ^{[2
]}

Lundgren, E. ^{[1
]}

机构：

[1] Lund Univ, Div Synchrotron Radiat Res, SE-22100 Lund, Sweden

[2] Tech Univ Munich, Dept Chem, D-85747 Garching, Germany

[3] Norwegian Univ Sci & Technol, Dept Phys, NO-7491 Trondheim, Norway

[4] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, ALS, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 11期

关键词：

ROOT-5)R27-DEGREES-O SURFACE OXIDE; PRESSURES; 2; PALLADIUM; PT-GROUP METALS; CO OXIDATION; ULTRAHIGH-VACUUM; PD(100); PLATINUM;

D O I：

10.1103/PhysRevLett.110.117601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present high-pressure x-ray photoelectron spectroscopy (HP-XPS) and first-principles kinetic Monte Carlo study addressing the nature of the active surface in CO oxidation over Pd(100). Simultaneously measuring the chemical composition at the surface and in the near-surface gas phase, we reveal both O-covered pristine Pd(100) and a surface oxide as stable, highly active phases in the near-ambient regime accessible to HP-XPS. Surprisingly, no adsorbed CO can be detected during high CO2 production rates, which can be explained by a combination of a remarkably short residence time of the CO molecule on the surface and mass-transfer limitations in the present setup. DOI: 10.1103/PhysRevLett.110.117601

引用

页数：5

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