Loading...

Heterogenization of Manganese Porphyrins in Zeolite Imidazolate Framework-8 and Mg–Al Layered Double Hydroxide Structures, Via Host-Guest Interactions, and Investigation of their Catalytic Activity for Olefins Epoxidation

Mesbahi, Elnaz | 2019

882 Viewed
  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 52904 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Bagherzadeh, Mojtaba
  7. Abstract:
  8. In this work heterogenization of manganese porphyrins in ZIF-8 and Mg-Al-LDHs structures is performed, via host-guest interactions, and their catalytic activities for olefins epoxidation are also investigated.A heterogenized meso-tetrakis(2,3-dihydroxyphenyl)porphyrinatomanganese(III) acetate at zeolite imidazolate framework-8 (T(2,3-OHP)PorMn@ZIF-8) is investigated in the catalytic olefin epoxidation reactions at room temperature at the first part. Heterogenization is done through a non-classical hydrogen bond proposed between T(2,3-OHP)PorMn bearing O-H groups and C-H of the 2-methylimidazolate linkers in ZIF-8 structure. The aforementioned compound characterized by X-ray powder diffraction (XRD), atomic absorption spectroscopy (AAS), nitrogen adsorption−desorption, FT-IR spectroscopy, field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and raman spectroscopy. The catalytic system with rather high potential of reusability is proposed as a fairly efficient epoxidation catalyst comparing to the reports in the homogeneous media.The second presents preparation and characterization of a new catalytic material comprising Mg-Al layered double hydroxides (LDHs) and intercalated manganese(III)-5, 10, 15, 20-tetrakis(4-benzoate)porphyrin acetate. Characterization is surveyed via X-ray powder diffraction (XRD), ICP Atomic Emission Spectroscopy (ICP-AES), field emission scanning electron microscopy (FE-SEM), Energy-dispersive X-ray spectroscopy (EDX), FT-IR spectroscopy, transmission electron microscopy (TEM) and Ultra Violate (UV-Vis). The prepared composite exhibited excellent catalytic activity in the selective epoxidation of various olefins with tetra-n-butyl ammonium hydrogen monopersulfate as an oxidant under mild reaction conditions. Furthermore, the results represent that the catalytic system could be reused nine times without significant reduction in conversion percentage and any special care or additional treatment of the catalyst
  9. Keywords:
  10. Catalytic Epoxidation ; Layered Double Hydroxide (LDH) ; Zeolite Imidazolate Framework ; Heteroscedasticity ; Manganese-Porphyrin Complexes ; Olefins Epoxidation

 Digital Object List

 Bookmark

...see more