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Synthesis, Characterization and Catalytic Activity of Supported Vanadium Schiff Base Complex as a Magnetically Recoverable Nanocatalyst in Epoxidation of Alkenes and Oxidation Of Sulfides

Bahjati, Mohammad | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51842 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Bagherzadeh, Mojtaba
  7. Abstract:
  8. In this project, a new magnetically recoverable nanocatalyst was developed by immobilizing of vanadyl acetylacetonate, [VO(acac)2], onto surface of silica coated magnetite nanoparticlest that modified by reaction between 3-aminopropylthriethoxy silane and 5-bromosalicylaldehyde. In the first step, magnetite cores were synthesized by co-precipitation method and coated by tetraethyl orthosilicate (TEOS) and modified by 3-aminopropyltriethoxy silane to provide a precursor for Schiff base condensation reaction. In the next step, amino-functionalized silica coated magnetite nanoparticles were reacted by 5-bromosalicylaldehyde to formation a Schiff base moiety onto surface of magnetite coated nanoparticles. Eventually, the obtained nanocatalyst was synthesized by immobilization of vanadyl acetylacetonate onto surface of modified magnetite nanoparticles. The prepared nanocatalyst was characterized by several techniques. These nanoparticles have been used as a magnetically recoverable nanocatalyst for epoxidation of alkenes to corresponding epoxides at 85 °C using TBHP as oxidant in 1, 2- dichloroethane as optimized solvent. To examine the stability and reusability of the prepared nanoparticles, they have been used in the consecutive catalytic cycles. Finally, oxidation of some sulfides in the presence of nanocatalyst was studied. The results show that oxidation of sulfides to corresponding sulfoxides under optimization condition that found for epoxidation of alkenes exhibited excellent conversion and selectivity
  9. Keywords:
  10. Magnetite ; Nano Catalyst ; Vanadyl Acetylactonate ; Alkene ; Sulfide ; Alkenes Epoxidation ; Sulfide Oxidation

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