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Conclusion
In summary, a Mo(VI) complex was immobilized on mag-
netic and non-magnetic supports. The obtained hetero-
genized catalysts were characterized with various characteri-
zation techniques, and their advantages and disadvantages
in catalytic oxidation of sulfides were discussed. Among
the tested catalysts, catalyst 1 with micro-size silica support
showed the lowest catalytic activity. However, this catalyst
can be recycled by simple filtration without any loss of cat-
alytic efficiency. Although catalyst 2 (nano-SiO2 support)
exhibited the high efficiency in the first catalytic cycle, but
its catalytic activity was significantly reduced in the next
cycles due to the difficulties which arose in the course of
the separation of catalysts particles. The Mo(VI) complex
immobilized on silica-coated magnetic nanoparticles (cata-
lyst 3) was the best-performing catalyst for catalytic oxida-
tion of sulfides under the experimental conditions investi-
gated. In this application, the magnetic catalyst 3 has many
advantages such as high conversions and selectivities, appli-
cability to a wide range of sulfides, high loading value, and
successful recycle of catalyst by simple magnetic separation.
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Acknowledgements We are grateful to the Faculty of Chemistry of
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1 3