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Design and Synthesis of Heterogeneous Nano Catalyst Based on Immobilized Palladium Metal on Double Network Hydrogel and Its Application in Organic Reactions

Ghasemzadeh, Solmaz | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49873 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Pourjavadi, Ali
  7. Abstract:
  8. In the past few decades, many attempts have been made to combine the benefits of homogeneous and heterogeneous catalysts. The immobilization of homogeneous catalysts onto the surface of heterogeneous supports is the result of such efforts. In this research, immobilized heterogeneous catalysts were designed and synthesized based on double network hydrogels, which produce from interpenetrating of two biocompatible and biodegradable polymer networks. In order to provide magnetic responsibility and easy separation of catalyst from the reaction mixture, the magnetic nanoparticles were dispersed onto the surface of double network hydrogel. Finally, various metal nanoparticles such as palladium and gold were decorated onto the surface of polymeric supports. Some of the advantage of using such catalyst is high loading, high porosity and ultra-high mechanical strength. Because of interpenetrating of two networks, the synthesized catalysts are so tough and improve the recyclability of catalyst. Also synthesized catalysts showed high loading capacity. It is because of the presence of numerous active agent groups on the surface of the support, which makes them better interacting with the applied metals. Finally, the activities of the resulting catalysts were evaluated in the various organic reactions, such as heck reaction, oxidation and reduction. The aim of this project is the use of double network hydrogels as catalytic support. The loading amounts of these new types of hydrogels for gold nanoparticles and palladium nanoparticles were 1.32 mmol.g-1 and 0.78 mmol.g-1, respectively. The high loading capacity of these supports, reduces the amount of catalytic utilization in chemical reactions and also increases the yield of the reactions
  9. Keywords:
  10. Mechanical Strength ; Double Network Hydrogel ; Alginate ; Poly Vinyl Alcohol ; Heterogeneous Nanocatalyst ; Nanomagnetic Catalyst

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