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Catalysis Letters

, Volume 127, Issue 1–2, pp 75–82 | Cite as

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

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

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.

Keywords

Core-shell structure Monodisperse silica particles Site-isolated Ti centers Selective oxidation H2O2 

Notes

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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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Marina V. Barmatova
    • 1
  • Irina D. Ivanchikova
    • 1
  • Oxana A. Kholdeeva
    • 1
  • Alexander N. Shmakov
    • 1
  • Vladimir I. Zaikovskii
    • 1
  • Maxim S. Mel’gunov
    • 1
  1. 1.Boreskov Institute of CatalysisNovosibirskRussia

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