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
收藏
页码：5755 / 5762
页数：8
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