Molecular approaches towards mixed metal oxides and their behaviour in mixed oxide support Au catalysts for CO oxidation

被引：25

作者：

Geserick, Jasmin ^{[1
]}

Froeschl, Thomas ^{[1
]}

Huesing, Nicola ^{[1
]}

Kucerova, Gabriela ^{[2
]}

Makosch, Martin ^{[2
]}

Diemant, Thomas ^{[2
]}

Eckle, Stephan ^{[2
]}

Behm, R. Juergen ^{[2
]}

机构：

[1] Univ Ulm, Inst Inorgan Chem 1, D-89069 Ulm, Germany

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

来源：

DALTON TRANSACTIONS | 2011年 / 40卷 / 13期

关键词：

TEMPERATURE-PROGRAMMED DESORPTION; MESOPOROUS AU/TIO2 CATALYSTS; GOLD CATALYSTS; TITANIA-SILICA; CARBON-MONOXIDE; ACTIVE GOLD; MODIFIED SILANES; PARTICLE-SIZE; SURFACE-AREA; THIN-FILMS;

D O I：

10.1039/c0dt00911c

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

We herein report a water-based sol-gel approach towards porous mixed Si/Ti oxides using co-precipitated glycol-modified precursors. By adjusting synthesis parameters such as the pH value and the Si/Ti ratio of the precursor, the morphology as well as the Si/Ti-composition of the resulting mixed oxide particles can be varied in a wide range. The behaviour of the mixed oxides as substrates for Au catalysts and the performance of the resulting catalysts in the CO oxidation reaction was investigated and compared to catalysts supported on mesoporous anatase and rutile synthesized analogously. For comparable Au particle sizes and Au loadings, the composition of the mixed oxide support was found to significantly affect the reactivity and reaction behaviour, with mixed oxide supported Au catalysts synthesized at pH = 5 or 10 and with a Si/Ti-ratio of 1 : 19 and 1 : 34 exhibiting the maximum activity. In contrast to the enhanced activity, the mixed oxide supports do not lead to a significant improvement in deactivation behaviour and catalyst stability.

引用

页码：3269 / 3286

页数：18

共 101 条

[21] Influence of CO2 and H2 on the low-temperature water-gas shift reaction on Au/CeO2 catalysts in idealized and realistic reformate [J].

Denkwitz, Y. ;

Karpenko, A. ;

Plzak, V. ;

Leppelt, R. ;

Schumacher, B. ;

Behm, R. J. .

JOURNAL OF CATALYSIS, 2007, 246 (01) :74-90

[22] Influence of the crystalline phase and surface area of the TiO2 support on the CO oxidation activity of mesoporous Au/TiO2 catalysts [J].

Denkwitz, Y. ;

Makosch, M. ;

Geserick, J. ;

Hoermann, U. ;

Selve, S. ;

Kaiser, U. ;

Huesing, N. ;

Behm, R. J. .

APPLIED CATALYSIS B-ENVIRONMENTAL, 2009, 91 (1-2) :470-480

[23]

DENKWITZ Y, IN PRESS

[24] Activity, stability, and deactivation behavior of supported Au/TiO2 catalysts in the CO oxidation and preferential CO oxidation reaction at elevated temperatures [J].

Denkwitz, Yvonne ;

Schumacher, Birgit ;

Kucerova, Gabriela ;

Behm, R. Juergen .

JOURNAL OF CATALYSIS, 2009, 267 (01) :78-88

[25] SIO2 IN 6-3 (STISHOVITE) AND 4-2 COORDINATION - CHARACTERIZATION BY CORE LEVEL SPECTROSCOPY (XPS XAES) [J].

FINSTER, J .

SURFACE AND INTERFACE ANALYSIS, 1988, 12 (1-12) :309-314

[26] Active nonmetallic Au and Pt species on ceria-based water-gas shift catalysts [J].

Fu, Q ;

Saltsburg, H ;

Flytzani-Stephanopoulos, M .

SCIENCE, 2003, 301 (5635) :935-938

[27] Titania-silica as catalysts: molecular structural characteristics and physico-chemical properties [J].

Gao, XT ;

Wachs, IE .

CATALYSIS TODAY, 1999, 51 (02) :233-254

[28] Detection, quantification, and magnetic field dependence of solid-state 17O NMR of X-O-Y (X,Y = Si,Ti) linkages:: Implications for characterizing amorphous titania-silica-based materials [J].

Gervais, C ;

Babonneau, F ;

Smith, ME .

JOURNAL OF PHYSICAL CHEMISTRY B, 2001, 105 (10) :1971-1977

[29]

Geserick J., 2007, MATER RES SOC S P, V1007, pS04

[30] Comparative study of Au/TiO2 and Au/ZrO2 catalysts for low-temperature CO oxidation [J].

Grunwaldt, JD ;

Maciejewski, M ;

Becker, OS ;

Fabrizioli, P ;

Baiker, A .

JOURNAL OF CATALYSIS, 1999, 186 (02) :458-469

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