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  1. سنتز کمپلکس های شیف باز آهن و وانادیم بر پایه ی نانوذره های مغناطیسی هسته - لایه Fe3O4@SiO2 و کاربرد آنها به عنوان کاتالیزور در اکسایش سولفیدها، الکل ها و الفین ها
سنتز کمپلکس های شیف باز آهن و وانادیم بر پایه ی نانوذره های مغناطیسی هسته - لایه Fe3O4@SiO2 و کاربرد آنها به عنوان کاتالیزور در اکسایش سولفیدها، الکل ها و الفین ها
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سنتز کمپلکس های شیف باز آهن و وانادیم بر پایه ی نانوذره های مغناطیسی هسته - لایه Fe3O4@SiO2 و کاربرد آنها به عنوان کاتالیزور در اکسایش سولفیدها، الکل ها و الفین ها

پایاب، ابراهیم Payab, Ebrahim

Synthesis of Core-Shell Nanoparticles Supported Iron and Vanadium Schiff Base and Their Application as a Catalyst for Oxidation of Sulfides, Alcohols and Olefins

Payab, Ebrahim | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43781 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Bagherzadeh, Mojtaba
  7. Abstract:
  8. In this work, synthesized Fe3O4 magnetic nanoparticles andcoated with SiO2 to prepare magnetic core-shell nanoparticles. Then immobilized Schiff baseof iron and vanadium complexes on magnetic core-shell nanoparticles was prepared as a recoverable magnetic nano catalysts. These catalysts were named Fe3O4@SiO2@L1@Fe, Fe3O4@SiO2@L2@Fe and Fe3O4@SiO2@L3@V. Furthermore,olefines epoxidation, sulfides and alcohols oxidation were studied with using iron and vanadium magnetic nano catalysts. The supported catalysts were characterized by atomic absorption, FT-IR and UV–Vis spectra.The catalytic performance of the synthesized iron catalyst was tested for the epoxidation of cyclohexene, styrene and cyclooctene with Fe3O4@SiO2@L1@Fe and Fe3O4@SiO2@L2@Fe. The best reaction condition was achieved in acetonitrile at 70 oC by hydroperoxide TBHP as an oxidant with 80% conversion for epoxidation of cyclohexene with Fe3O4@SiO2@L2@Fe nano catalyst. In additionimmobilized vanadium Schiff base catalysis in CH2Cl2/methanol as solvent using 1 mmol of both methyl phenyl sulfide and urea hydrogen peroxide (UHP) was run to selective oxidation of methyl phenyl sulfide to corresponding sulfoxide in 95% conversion.Oxidation of alcohols was examined by Fe3O4@SiO2@L3@Vand Oxon as oxidant in CH2Cl2/H2O solvent in present of t-butylammonium bromideas phase transfer catalyst. Finally, the catalysts can be reused for at least 5 reaction cycles without significant loose of activity
  9. Keywords:
  10. Olefins Epoxidation ; Sulfide Oxidation ; Alcohol Oxidation ; Recyclable Catalysts ; Magnetic Nano Core-Shell

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