Hierarchically Porous Rutile Titania:  Harnessing Spontaneous Compositional Change in Mixed-Metal Oxides

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Abstract

In numerous applications involving fluid flow through a porous structure, performance improvements, such as better flow characteristics and increased fluid−solid contact, are obtained when multiple length scales of porosity are present in the porous medium. To this end, we have developed a route to hierarchically porous rutile titania that obviates the need for preformed or preassembled structure-directing agents. The preparation involves the successive leaching of phases and components from a dense composite of wurtzite ZnO and inverse spinel Zn₂TiO₄. The resulting monoliths are composed of grains of highly crystalline rutile titania and possess a hierarchy of interconnected pores with length scales of 5 μm and 100 nm. Ex situ solid-state ⁶⁷Zn and ^47,49Ti NMR has helped probe local environments around these elements in both the mixed and pure crystalline materials that are formed during the leaching processes.

Citing Articles

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This article has been cited by 2 ACS Journal articles (2 most recent appear below).

• 

  Solid-State ^47/49Ti NMR of Titanocene Chlorides

  Aaron J. Rossini, Ivan Hung, and Robert W. Schurko
  The Journal of Physical Chemistry Letters2010 1 (20), 2989-2998

  • Solid-State ^47/49Ti NMR of Titanocene Chlorides

    Aaron J. Rossini, Ivan Hung, and Robert W. Schurko
    The Journal of Physical Chemistry Letters2010 1 (20), 2989-2998

    Magic angle spinning (MAS) and static 47/49Ti solid-state NMR (SSNMR) spectra of the cyclopentadienyl (Cp) titanium chloride compounds, Cp2TiCl2 (1), Cp*2TiCl2 (2) [Cp* = C5Me5], CpTiCl3 (3), and Cp*TiCl3 (4) have been acquired at magnetic field strengths ...

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• 

  Controlled Fabrication of Porous Titania Beads by a Sol−Gel Templating Method

  Kai-Feng Du, Dong Yang and Yan Sun
  Industrial & Engineering Chemistry Research2009 48 (2), 755-762

  • Controlled Fabrication of Porous Titania Beads by a Sol−Gel Templating Method

    Kai-Feng Du, Dong Yang and Yan Sun
    Industrial & Engineering Chemistry Research2009 48 (2), 755-762

    Porous titania beads were synthesized by a sol−gel templating method using agarose gel as template. The morphology and structure of the materials were characterized by X-ray diffraction, scanning electron microscopy, high-resolution transmission electron ...

    Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links

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