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Titanium-Doped Solid Core-Mesoporous Shell Silica Particles: Synthesis and Catalytic Properties in Selective Oxidation Reactions

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Abstract

Near monodisperse spherical particles composed of a nonporous silica core covered by a Ti-doped hexagonally arranged mesoporous silica shell, Ti-SCMS, as well as spherical submicron-size particles of Ti-MCM-41, have been synthesized for the first time and characterized by elemental analysis, N2 adsorption, XRD, TEM and DR-UV spectroscopy. The mesoporous Ti,Si-shell has a thickness of about 45 nm and incorporates isolated Ti centers in tetrahedral coordination. Catalytic properties of Ti-SCMS and Ti-MCM-41 have been studied in selective oxidation of three representative bulky organic substrates, 2,3,6-trimethylphenol, methyl phenyl sulfide and caryophyllene, with aqueous H2O2 in MeCN medium. Ti-SCMS appeared to be more active and selective in the H2O2-based selective oxidation reactions compared to Ti-MCM-41, thus demonstrating an advantage of conducting a catalytic process in a thin mesoporous Ti,Si-shell.

Graphical Abstract

Near monodisperse spherical silica particles with a solid inert core covered by a well-ordered mesoporous shell, containing site-isolated Ti centers, have been synthesized, characterised and found to be highly active in selective oxidations with H2O2.

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Acknowledgment

The work was partially supported by the Russian Foundation for Basic Research (grants 06-03-08102 and 05-03-34760).

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Authors and Affiliations

  1. Boreskov Institute of Catalysis, 5 Acad. Lavrentiev Avenue, Novosibirsk, 630090, Russia

    Marina V. Barmatova, Irina D. Ivanchikova, Oxana A. Kholdeeva, Alexander N. Shmakov, Vladimir I. Zaikovskii & Maxim S. Mel’gunov

Authors
  1. Marina V. Barmatova
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  2. Irina D. Ivanchikova
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  3. Oxana A. Kholdeeva
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  4. Alexander N. Shmakov
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  5. Vladimir I. Zaikovskii
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  6. Maxim S. Mel’gunov
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Corresponding author

Correspondence to Marina V. Barmatova.

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Barmatova, M.V., Ivanchikova, I.D., Kholdeeva, O.A. et al. Titanium-Doped Solid Core-Mesoporous Shell Silica Particles: Synthesis and Catalytic Properties in Selective Oxidation Reactions. Catal Lett 127, 75–82 (2009). https://doi.org/10.1007/s10562-008-9632-0

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  • DOI: https://doi.org/10.1007/s10562-008-9632-0

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