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Nano Ag-doped magnetic-Fe3O4@mesoporous TiO2 core–shell hollow spheres: synthesis and enhanced catalytic activity in A3 and KA2 coupling reactions

Abstract

Nano Ag-doped Fe3O4@mesoporous TiO2 core–shell hollow spheres (h-Fe3O4@m-TiO2/Ag) were efficiently prepared. They were fully characterized by FT-IR, FE-SEM, EDX, ICP, TGA, XRD, and BET methods. In addition, their magnetic properties were determined by means of the VSM method. Also, the ρ shell of the prepared hollow Fe3O4 micro-particles was calculated, being found just slightly lighter than that of solid sphere-like Fe3O4. The catalytic activity of this novel catalyst system was successfully examined as a novel catalyst system in A3 coupling reactions (aldehyde + amine + acetylene). This highly active magnetic catalyst was easily separated using an external magnet and re-used in five consecutive runs in the model reaction without appreciable loss of its catalytic activity.

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Acknowledgements

The authors gratefully acknowledge the Semnan University Science and Technology Park, Research Council and Vice-chancellor for Education and Postgraduate student for financial support of this work.

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Correspondence to Friuozeh Nemati or Majid M. Heravi.

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Elhampour, A., Nemati, F. & Heravi, M.M. Nano Ag-doped magnetic-Fe3O4@mesoporous TiO2 core–shell hollow spheres: synthesis and enhanced catalytic activity in A3 and KA2 coupling reactions. Monatsh Chem 148, 1793–1805 (2017). https://doi.org/10.1007/s00706-017-1948-2

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  • DOI: https://doi.org/10.1007/s00706-017-1948-2

Keywords

  • Nanocatalyst
  • Hollow sphere
  • Silver catalyst
  • Three-component reaction
  • Heterogeneous catalyst