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  1. اکسایش سولفیدها و الفین‌ها در حضورکاتالیست نانوخوشه پلی اکسو تنگستات میان‌لایه‌سازی شده در نانوذرات لایه هیدروکسید مضاعف (LDH)
اکسایش سولفیدها و الفین‌ها در حضورکاتالیست نانوخوشه پلی اکسو تنگستات میان‌لایه‌سازی شده در نانوذرات لایه هیدروکسید مضاعف (LDH)
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اکسایش سولفیدها و الفین‌ها در حضورکاتالیست نانوخوشه پلی اکسو تنگستات میان‌لایه‌سازی شده در نانوذرات لایه هیدروکسید مضاعف (LDH)

قریشی کاوردی، عاطفه السادات Qoreishi Kavardi, Atefeh Sadat

Oxidation of Sulfides and Olefins in the Presence of Nanocluster Polyoxotungstate–intercalated Layered Double Hydroxide Nanoparticles as a Catalyst

Qoreishi Kavardi, Atefeh Sadat | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48757 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Bagherzadeh, Mojtaba
  7. Abstract:
  8. In this study, polyoxometalate (POM) intercalated in the layered double hydroxide (LDH) was synthesized by a selective ion-exchange method. For this purpose, the nanocluster [VW12O40]3- was immobilized on the Mg2+/A13+/Cl–LDH support. The heterogeneous catalyst was characterized by FT-IR, XRD, SEM and analysis of ICP. The LDH-POM was applied as a catalyst in efficient oxidation of sulfides to sulfoxides using UHP as oxidant and CH3OH/ CH¬2¬Cl¬2 ¬as a solvent at room temperature, as well as epoxidation of olefins using TBHP as an oxidants and C¬2H4Cl2 as a solvent in 84°C. This catalyst showed excellent catalytic activities for a substrate/catalyst ratio (200:1). For example, this catalytic system, completely convert methyl phenyl sulfide to methyl phenyl sulfoxide (100%) and cyclooctene changing to corresponding epoxide with 82% conversion. The heterogeneous LDH-POM catalyst shows much higher epoxide selectivity than the corresponding homogeneous polyoxotungstate (POM) catalyst, which can be attributed to the beneficial effect of basic LDH host. The LDH-POM showed acceptable reactivity in oxidation, without significant loss of activity within three successive runs
  9. Keywords:
  10. Heterogeneous Catalysis ; Ion Exchange ; Nano-Cluster ; Nano Catalyst ; Layered Double Hydroxide (LDH) ; Polyoxtungstate

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  • Oxidation of sulfides and olefins in the presence of nanocluster polyoxotungstate –intercalated layered double hydroxide nanoparticles as a catalyst