Enhanced Stability of Gold Clusters Supported on Hydroxylated MgO(001) Surfaces

被引：56

作者：

Brown, Matthew A. ^{[1
]}

Carrasco, Esther ^{[1
]}

Sterrer, Martin ^{[1
]}

Freund, Hans-Joachim ^{[1
]}

机构：

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

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2010年 / 132卷 / 12期

关键词：

CO OXIDATION; MODEL CATALYSTS; OXIDE SURFACES; TEMPERATURE; FILMS; ADSORPTION; WATER; NANOPARTICLES; NANOCLUSTERS; TIO2(110);

D O I：

10.1021/ja100343m

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The influence of surface hydroxylation on nucleation and sintering of gold nanoparticles was studied by comparison of Au deposition and thermal sintering on ideally terminated MgO(001) and hydroxylated MgO thin films, respectively. A combination of different spectroscopic techniques (TDS, XPS, IRAS) allows to establish a correlation between the degree of surface hydroxylation and the stability of gold atoms and clusters. Hydroxyl groups destabilize gold atoms on the MgO surface at 90 K; however, they enhance the stability of small gold clusters toward sintering at higher temperature.

引用

页码：4064 / +

页数：3

共 29 条

[1] Au/TiO2 nanosized samples:: A catalytic, TEM, and FTIR study of the effect of calcination temperature on the CO oxidation [J].

Boccuzzi, F ;

Chiorino, A ;

Manzoli, M ;

Lu, P ;

Akita, T ;

Ichikawa, S ;

Haruta, M .

JOURNAL OF CATALYSIS, 2001, 202 (02) :256-267

[2] Catalysis by gold [J].

Bond, GC ;

Thompson, DT .

CATALYSIS REVIEWS-SCIENCE AND ENGINEERING, 1999, 41 (3-4) :319-388

[3] Unravelling the Nature of Gold Surface Sites by Combining IR Spectroscopy and DFT Calculations. Implications in Catalysis [J].

Boronat, M. ;

Concepcion, P. ;

Corma, A. .

JOURNAL OF PHYSICAL CHEMISTRY C, 2009, 113 (38) :16772-16784

[4] Ultrathin metal films and particles on oxide surfaces: Structural, electronic and chemisorptive properties [J].

Campbell, CT .

SURFACE SCIENCE REPORTS, 1997, 27 (1-3) :1-111

[5] Nature of the active site for CO oxidation on highly active Au/γ-Al2O3 [J].

Costello, CK ;

Kung, MC ;

Oh, HS ;

Wang, Y ;

Kung, HH .

APPLIED CATALYSIS A-GENERAL, 2002, 232 (1-2) :159-168

[6] Negative activation energies in CO oxidation over an icosahedral Au/Mg(OH)2 catalyst [J].

Cunningham, DAH ;

Vogel, W ;

Haruta, M .

CATALYSIS LETTERS, 1999, 63 (1-2) :43-47

[7] The effect of high-temperature pre-treatment and water on the low temperature CO oxidation with Au/Fe2O3 catalysts [J].

Daniells, ST ;

Makkee, M ;

Moulijn, JA .

CATALYSIS LETTERS, 2005, 100 (1-2) :39-47

[8] Adsorption of gases on complex: Solid surfaces [J].

Freund, HJ .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH, 1997, 36 (05) :452-475

[9] Interaction of nanostructured metal overlayers with oxide surfaces [J].

Fu, Qiang ;

Wagner, Thomm .

SURFACE SCIENCE REPORTS, 2007, 62 (11) :431-498

[10] Gold nanoclusters deposited on SiO2 via water as buffer layer:: CO-IRAS and TPD characterization [J].

Gross, Elad ;

Asscher, Micha ;

Lundwall, Matthew ;

Goodman, D. Wayne .

JOURNAL OF PHYSICAL CHEMISTRY C, 2007, 111 (44) :16197-16201

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