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Kinetic Study of Heterogeneous and Homogeneous Catalytic Reactions in Molecular Solvents and Ionic Liquids

Salari, Hadi | 2013

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 45254 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Gholami, Mohammad Reza
  7. Abstract:
  8. Selective oxidation of cyclohexene and styrene were investigated using molecular oxygen under mild conditions. Au/TiO2 and Au/Al2O3 surfaces were impregnated with three different Ionic Liquids. Supported Ionic Liquids gold nanocatalysts are particularly versatile catalysts for oxidation reaction with exceptionally high efficiency and significant selectivity.
    Selective oxidation of alkenes by hexadecyl-trimethyl-ammonium bromide-stabilized gold nanorods and gold nanosphere were investigated using molecular oxygen in aqueous solution under mild conditions. Colloidal gold nanoparticles are particularly versatile catalysts for oxidation reaction with exceptionally high efficiency and selectivity. Surface coating of obtained nanoparticles with anionic polyelectrolyte of poly acrylic acid (PAA) is found to prevent the possibility of aggregation. However, lower catalytic activity was observed due to diffusion limitation. Gold nanorods exhibited a slightly enhanced activity compare to gold nanospheres.
    Synchronous heterogeneous catalytic oxidation of cyclohexene, styrene and some alkoholes, catalyzed by impregnated Au/TiO2 and Au/Al2O3, were carried out at 25 ºC. Correlations of logk vs. π* (dipolarity/polarizibility) and β (hydrogen-bond acceptor basicity) parameters gives reasonable results in the solution.
  9. Keywords:
  10. Gold Nanoparticle ; Ionic Liquids ; Oxidation Reactions ; Oxygen

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