Nanocasting of ordered mesoporous Co3O4-based polyoxometalate composite frameworks

Gerasimos S. Armatas, Alexandros P. Katsoulidis, Dimitris E. Petrakis, Philippos J. Pomonis, Mercouri G. Kanatzidis

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

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 N2 physisorption measurements reveal that all mesoporous frameworks possess a three-dimensional cubic symmetry with large internal Brumauer-Emmett-Teller (BET) surface area (87-141 m2g-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 Co3O 4/HPW composites can be effective catalysts, exhibiting remarkable catalytic activity on direct decomposition of N2O.

Original languageEnglish
Pages (from-to)5739-5746
Number of pages8
JournalChemistry of Materials
Volume22
Issue number20
DOIs
Publication statusPublished - Oct 26 2010

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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