Reactivity of Au nanoparticles supported over SiO2 and TiO2 studied by ambient pressure photoelectron spectroscopy

被引：36

作者：

Herranz, Tirma ^{[1
]}

Deng, Xingyi ^{[1
]}

Cabot, Andreu ^{[1
]}

Alivisatos, Paul ^{[1
]}

Liu, Zhi

Soler-Illia, Galo ^{[2
]}

Salmeron, Miquel ^{[1
,3
]}

机构：

[1] Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA

[2] UAQ CAC CNEA, Comis Nacl Energia Atom, Unidad Actividad Quim, Buenos Aires, DF, Argentina

[3] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

来源：

CATALYSIS TODAY | 2009年 / 143卷 / 1-2期

关键词：

Gold; Titanium oxide; Ambient pressure photoelectron; spectroscopy; In situ XPS; Model catalysts; LOW-TEMPERATURE OXIDATION; CO OXIDATION; CATALYZED OXIDATION; GOLD NANOPARTICLES; ACTIVE GOLD; TITANIA; OXYGEN; ADSORPTION; CLUSTERS; PHASE;

D O I：

10.1016/j.cattod.2008.09.023

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The influence of the metal cluster size and the support on the reactivity of gold-based catalysts has been Studied in the CO oxidation reaction. To overcome the structural complexity of the supported catalysts, gold nanoparticles synthesized from colloidal chemistry with precisely controlled size have been used. Those particles were supported over SiO2 and TiO2 and their catalytic activity measured in a flow reactor. The reaction rate was dependent on the particle size and on the support, suggesting two reaction pathways in the CO oxidation reaction. In parallel, ambient pressure photoelectron spectroscopy (APPS) has been performed under reaction conditions using bidimensional model catalysts prepared by supporting Au nanoparticles over planar polycrystalline SiO2 and TiO2 thin films. The nanoparticles were transferred from a water surface where they have been dispersed by means of the Langmuir-Blodgett (LB) technique. In this way, the catalytically active surface was characterized under real reaction conditions, revealing that during CO oxidation gold remains in the metallic state. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：158 / 166

页数：9

共 43 条

[1] Mesoporous anatase TiO2 films:: Use of TiK XANES for the quantification of the nanocrystalline character and substrate effects in the photocatalysis behavior [J].

Angelome, Paula C. ;

Andrini, Leandro ;

Calvo, Mauricio E. ;

Requejo, Felix Gregorio ;

Bilmes, Sara A. ;

Soler-Illia, Galo J. A. A. .

JOURNAL OF PHYSICAL CHEMISTRY C, 2007, 111 (29) :10886-10893

[2] Effects of hydrogen on the reactivity of O2 toward gold nanoparticles and surfaces [J].

Barrio, Laura ;

Liu, Ping ;

Rodriguez, Jose A. ;

Campos-Martin, Jose M. ;

Fierro, Jose L. G. .

JOURNAL OF PHYSICAL CHEMISTRY C, 2007, 111 (51) :19001-19008

[3] 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

[4]

Bond G.C., 2006, Catalytic Science Series, V6

[5] Gold-catalysed oxidation of carbon monoxide [J].

Bond, GC ;

Thompson, DT .

GOLD BULLETIN, 2000, 33 (02) :41-51

[6] Vacancy coalescence during oxidation of iron nanoparticles [J].

Cabot, Andreu ;

Puntes, Victor F. ;

Shevchenko, Elena ;

Yin, Yadong ;

Balcells, Lluis ;

Marcus, Matthew A. ;

Hughes, Steven M. ;

Alivisatos, A. Paul .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2007, 129 (34) :10358-+

[7] The structure of catalytically active gold on titania [J].

Chen, MS ;

Goodman, DW .

SCIENCE, 2004, 306 (5694) :252-255

[8] Controlled formation of highly organized mesoporous titania thin films:: From mesostructured hybrids to mesoporous nanoanatase TiO2 [J].

Crepaldi, EL ;

Soler-Illia, GJDA ;

Grosso, D ;

Cagnol, F ;

Ribot, F ;

Sanchez, C .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2003, 125 (32) :9770-9786

[9] All that glitters is not Au0 [J].

Davis, RJ .

SCIENCE, 2003, 301 (5635) :926-927

[10] CO adsorption and oxidation on Au/TiO2 [J].

Dekkers, MAP ;

Lippits, MJ ;

Nieuwenhuys, BE .

CATALYSIS LETTERS, 1998, 56 (04) :195-197

← 1 2 3 4 5 →