Hydrogen spillover monitored by resonant photoemission spectroscopy

被引：49

作者：

Lykhach, Yaroslava ^{[1
]}

Staudt, Thorsten ^{[1
]}

Vorokhta, Mykhailo ^{[2
]}

Skala, Tomas ^{[3
]}

Johanek, Viktor ^{[2
]}

Prince, Kevin C. ^{[3
]}

Matolin, Vladimir ^{[2
]}

Libuda, Joerg ^{[1
,4
,5
]}

机构：

[1] Univ Erlangen Nurnberg, Dept Chem & Pharm, Lehrstuhl Phys Chem 2, D-91058 Erlangen, Germany

[2] Charles Univ Prague, Fac Math & Phys, Dept Surface & Plasma Sci, CR-18000 Prague 8, Czech Republic

[3] Sincrotrone Trieste SCpA, I-34149 Basovizza Trieste, Italy

[4] Univ Erlangen Nurnberg, Erlangen Catalysis Resource Ctr, D-91058 Erlangen, Germany

[5] Univ Erlangen Nurnberg, Interdisciplinary Ctr Interface Controlled Proc, D-91058 Erlangen, Germany

来源：

JOURNAL OF CATALYSIS | 2012年 / 285卷 / 01期

关键词：

Ceria; Platinum; Hydrogen; Hydrogen spillover; Model catalyst; Heterogeneous catalysis; Resonant photoemission spectroscopy; SPILT-OVER HYDROGEN; HETEROGENEOUS CATALYSIS; H-2; ADSORPTION; CEO2; 111; REDUCTION; PLATINUM; MECHANISMS; SURFACES; STORAGE; METALS;

D O I：

10.1016/j.jcat.2011.09.002

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 have employed resonant photoemission spectroscopy to investigate the phenomenon of hydrogen spillover on well-defined model Pt/ceria catalysts. On Pt/CeO2(111)/Cu(111), hydrogen spillover and reverse spillover give rise to reversible changes of the oxidation state of the surface cerium ions. These changes are monitored with highest sensitivity via resonant enhancement of Ce3+- and Ce4+-related features in the valence band photoemission spectra. The temperature regions are precisely determined in which specific processes such hydrogen spillover, Ce3+ transport, and reverse spillover are activated. (C) 2011 Elsevier Inc. All rights reserved.

引用

页码：6 / 9

页数：4

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