Nanocasting of Ordered Mesoporous Co3O4-Based Polyoxometalate Composite Frameworks

被引：43

作者：

Armatas, Gerasimos S. ^{[1
]}

Katsoulidis, Alexandros P. ^{[2
]}

Petrakis, Dimitris E. ^{[3
]}

Pomonis, Philippos J. ^{[3
]}

Kanatzidis, Mercouri G. ^{[2
]}

机构：

[1] Univ Crete, Dept Mat Sci & Technol, Iraklion 71003, Crete, Greece

[2] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA

[3] Univ Ioannina, Dept Chem, GR-45110 Ioannina, Greece

来源：

CHEMISTRY OF MATERIALS | 2010年 / 22卷 / 20期

关键词：

DIRECT N2O DECOMPOSITION; COBALT OXIDE; METAL-OXIDES; CATALYTIC PERFORMANCE; SUPERIOR PERFORMANCE; PLATINUM NANOWIRES; CARBON NANOTUBES; FACILE SYNTHESIS; SILICA; SURFACE;

D O I：

10.1021/cm101972h

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：

We report the synthesis of highly ordered mesoporous frameworks consisting of nanocrystalline Co3O4 and Keggin-type tungstophosphoric acid (HPW12O40, HPW) compounds using the hard-templating method. The resulting materials feature a Co3O4/HPW solid solution structure with different HPW loadings, i.e., 6, 11, 15, and 36 wt %. Characterization by small-angle X-ray scattering (SAXS), high-resolution transmission electron microscopy (TEM), and N-2 physisorption measurements reveal that all mesoporous frameworks possess a three-dimensional cubic symmetry with large internal Brumauer-Emmett-Teller (BET) surface area (87-141 m(2)g(-1)) and narrow sized pores (ca. 4 nm). The Keggin structure of the incorporated PW12O403- clusters within the composite frameworks was confirmed with X-ray diffused scattering and atomic pair distribution function (PDF) analysis, X-ray photoelectron spectroscopy (XPS), infrared (IR), and diffuse-reflectance UV/vis spectroscopy. Catalytic studies have indicated that these Co3O4/HPW composites can be effective catalysts, exhibiting remarkable catalytic activity on direct decomposition of N2O.

引用

页码：5739 / 5746

页数：8

共 60 条

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