CO oxidation on a single Pd atom supported on magnesia

被引：157

作者：

Abbet, S ^{[1
]}

Heiz, U

Häkkinen, H

Landman, U

机构：

[1] Univ Lausanne, Inst Phys Mat Condensee, CH-1015 Lausanne, Switzerland

[2] Univ Ulm, Inst Surface Chem & Catalysis, D-89069 Ulm, Germany

[3] Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 26期

关键词：

D O I：

10.1103/PhysRevLett.86.5950

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The oxidation of CO on Single Pd atoms anchored to MgO(100) surface oxygen vacancies is studied with: temperature-programmed-reaction mass spectrometry and infrared spectroscopy. In one-heating-cycle experiments, CO2, formed from O-2 and CO preadsorbed at 90 K, is detected at 260 and 500 K. Ab-initio simulations suggest two reaction routes, with Pd(CO)(2)O-2 and PdCO3CO found as precursors for the low and high temperature channels, respectively. Both reactions result in annealing of the vacancy and induce migration and coalescence of the remaining Pd-CO to form larger clusters.

引用

页码：5950 / 5953

页数：4

共 20 条

[1] Acetylene cyclotrimerization on supported size-selected Pdn clusters (1≤n≤30):: one atom is enough! [J].

Abbet, S ;

Sanchez, A ;

Heiz, U ;

Schneider, WD ;

Ferrari, AM ;

Pacchioni, G ;

Rösch, N .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2000, 122 (14) :3453-3457

[2]

ABBET S, IN PRESS J AM CHEM S

[3] RELATIVISTIC NORM-CONSERVING PSEUDOPOTENTIALS [J].

BACHELET, GB ;

SCHLUTER, M .

PHYSICAL REVIEW B, 1982, 25 (04) :2103-2108

[4] BORN-OPPENHEIMER MOLECULAR-DYNAMICS SIMULATIONS OF FINITE SYSTEMS - STRUCTURE AND DYNAMICS OF (H2O)2 [J].

BARNETT, RN ;

LANDMAN, U .

PHYSICAL REVIEW B, 1993, 48 (04) :2081-2097

[5] Design of a surface alloy catalyst for steam reforming [J].

Besenbacher, F ;

Chorkendorff, I ;

Clausen, BS ;

Hammer, B ;

Molenbroek, AM ;

Norskov, JK ;

Stensgaard, I .

SCIENCE, 1998, 279 (5358) :1913-1915

[6] Bridging the pressure and materials gaps: High pressure sum frequency generation study on supported Pd nanoparticles [J].

Dellwig, T ;

Rupprechter, G ;

Unterhalt, H ;

Freund, HJ .

PHYSICAL REVIEW LETTERS, 2000, 85 (04) :776-779

[7] Catalysis and surface science [J].

Ertl, G ;

Freund, HJ .

PHYSICS TODAY, 1999, 52 (01) :32-38

[8] Gold clusters (AuN, 2≤N≤10) and their anions [J].

Häkkinen, H ;

Landman, U .

PHYSICAL REVIEW B, 2000, 62 (04) :R2287-R2290

[9] Nanowire gold chains:: Formation mechanisms and conductance [J].

Häkkinen, H ;

Barnett, RN ;

Scherbakov, AG ;

Landman, U .

JOURNAL OF PHYSICAL CHEMISTRY B, 2000, 104 (39) :9063-9066

[10]

HAKKINEN H, IN PRESS

← 1 2 →