Insights into the active surface species formed on Ta2O5 nanotubes in the catalytic oxidation of CO

被引：81

作者：

Goncalves, Renato V. ^{[1
]}

Wojcieszak, Robert ^{[1
]}

Uberman, Paula M. ^{[1
]}

Teixeira, Sergio R. ^{[2
]}

Rossi, Liane M. ^{[1
]}

机构：

[1] Univ Sao Paulo, Inst Chem, Lab Nanomat & Catalysis, BR-05508000 Sao Paulo, Brazil

[2] UFRGS, Inst Phys, BR-15051 Rio Grande Do Sul, RS, Brazil

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2014年 / 16卷 / 12期

基金：

巴西圣保罗研究基金会;

关键词：

TANTALATE PHOTOCATALYSTS; HYDROGEN-PRODUCTION; VISIBLE-LIGHT; FILMS; ANODIZATION; DIFFRACTION; FABRICATION; NB2O5; O-2; H-2;

D O I：

10.1039/c3cp54887b

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：

Freestanding Ta2O5 nanotubes were prepared by an anodizing method. As-anodized amorphous nanotubes were calcined at high temperature to obtain a crystalline phase. All materials were studied by means of BET analysis, XRD, TEM, SEM, XPS, and FTIR and were evaluated in the catalytic oxidation of CO. An XPS study confirmed the formation of different tantalum surface species after high temperature treatment of amorphous Ta2O5 nanotubes. Calcination at 800 degrees C generated Ta4+ while higher temperature (1000 degrees C) treatment led to the formation of Ta3+ species. These materials also showed significant differences in catalytic activity. Higher activity was observed for samples calcined at 800 degrees C than at 1000 degrees C, suggesting that Ta4+ species are active sites for CO oxidation.

引用

页码：5755 / 5762

页数：8

共 27 条

[1] Self-Assembled Fabrication of Vertically Oriented Ta2O5 Nanotube Arrays, and Membranes Thereof, by One-Step Tantalum Anodization [J].

Allam, Nageh K. ;

Feng, Xinjian J. ;

Grimes, Craig A. .

CHEMISTRY OF MATERIALS, 2008, 20 (20) :6477-6481

[2] Enhanced CO Oxidation Rates at the Interface of Mesoporous Oxides and Pt Nanoparticles [J].

An, Kwangjin ;

Alayoglu, Selim ;

Musselwhite, Nathan ;

Plamthottam, Sheba ;

Melaet, Gerome ;

Lindeman, Avery E. ;

Somorjai, Gabor A. .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2013, 135 (44) :16689-16696

[3] Establishing the Role of Graphite as a Shaping Agent of Vanadium-Aluminum Mixed (Hydr)oxides and Their Physicochemical Properties and Catalytic Functionalities [J].

Baldovino-Medrano, Victor G. ;

Farin, Benjamin ;

Gaigneaux, Eric M. .

ACS CATALYSIS, 2012, 2 (03) :322-336

[4] CO oxidation by CeO2-Al2O3-CeAlO3 hybrid oxides [J].

Deshpande, Parag A. ;

Aruna, S. T. ;

Madras, Giridhar .

CATALYSIS SCIENCE & TECHNOLOGY, 2011, 1 (09) :1683-1691

[5] Controlled growth and monitoring of tantalum oxide nanostructures [J].

El-Sayed, Hany A. ;

Birss, Viola I. .

NANOSCALE, 2010, 2 (05) :793-798

[6] On the crystallization of Ta2O5 nanotubes: structural and local atomic properties investigated by EXAFS and XRD [J].

Goncalves, Renato V. ;

Migowski, Pedro ;

Wender, Heberton ;

Feil, Adriano F. ;

Zapata, Maximiliano J. M. ;

Khan, Sherdil ;

Bernardi, Fabiano ;

Azevedo, Gustavo M. ;

Teixeira, Sergio R. .

CRYSTENGCOMM, 2014, 16 (05) :797-804

[7] Ta2O5 Nanotubes Obtained by Anodization: Effect of Thermal Treatment on the Photocatalytic Activity for Hydrogen Production [J].

Goncalves, Renato V. ;

Migowski, Pedro ;

Wender, Heberton ;

Eberhardt, Dario ;

Weibel, Daniel E. ;

Sonaglio, Flavia C. ;

Zapata, Maximiliano J. M. ;

Dupont, Jairton ;

Feil, Adriano F. ;

Teixeira, Sergio R. .

JOURNAL OF PHYSICAL CHEMISTRY C, 2012, 116 (26) :14022-14030

[8] Titania nanotubes, nanorods and nanopowder in the carbon monoxide oxidation process [J].

Grigorieva, Anastasia V. ;

Goodilin, Eugene A. ;

Dubova, Ksenia L. ;

Anufrieva, Tatyana A. ;

Derlyukova, Lyudmila E. ;

Vyacheslavov, Alexander S. ;

Tretyakov, Yuri D. .

SOLID STATE SCIENCES, 2010, 12 (06) :1024-1028

[9] Titania nanotubes supported platinum catalyst in CO oxidation process [J].

Grigorieva, Anastasia V. ;

Goodilin, Eugene A. ;

Derlyukova, Lyudmila E. ;

Anufrieva, Tatyana A. ;

Tarasov, Alexey B. ;

Dobrovolskii, Yuri A. ;

Tretyakov, Yuri D. .

APPLIED CATALYSIS A-GENERAL, 2009, 362 (1-2) :20-25

[10] Hydrolysis of N2O5 on sub-micron sulfate aerosols [J].

Hallquist, M ;

Stewart, DJ ;

Stephenson, SK ;

Cox, RA .

PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2003, 5 (16) :3453-3463

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