Hollow and microporous catalysts bearing Cr(iii)–F porphyrins for room temperature CO2 fixation to cyclic carbonates

Hollow and microporous metal free/Cr-porphyrin networks were prepared via the Sonogashira coupling of metal-free or Cr-tetra(4-ethynylphenyl) porphyrins and 1,4-diiodobenzene on the surface of silica templates followed by silica etching. Zinc was introduced into a hollow and microporous metal free p...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2017, Vol.5 (45), p.23612-23619
Main Authors: Kim, Myung Hyun, Song, Taemoon, Ue Ryung Seo, Park, Ji Eun, Cho, Kyoungil, Sang Moon Lee, Hae Jin Kim, Yoon-Joo, Ko, Chung, Young Keun, Son, Seung Uk
Format: Article
Language:English
Subjects:
Carbon dioxide
Carbon dioxide fixation
Carbon sequestration
Carbonates
Catalysis
Catalysts
Catalytic activity
Chromium
Epoxides
Etching
Metals
Microporosity
Porphyrins
Room temperature
Silica
Silicon dioxide
Substrates
Zinc
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Summary:Hollow and microporous metal free/Cr-porphyrin networks were prepared via the Sonogashira coupling of metal-free or Cr-tetra(4-ethynylphenyl) porphyrins and 1,4-diiodobenzene on the surface of silica templates followed by silica etching. Zinc was introduced into a hollow and microporous metal free porphyrin network (H–MPN) through post-synthetic modification to form a H–MZnPN. Hollow and microporous Cr(iii)–F porphyrin networks (H–MCrPNs) showed the best catalytic activities in room temperature CO2 fixation with epoxides to cyclic carbonates. In addition, the H–MCrPN could be reused at least for five runs, maintaining the original catalytic activity. The good performance of the H–MCrPN is attributed to its microporosity, the shortened diffusion pathways for substrates due to the hollow structure, and the efficient Lewis acidic activity of Cr(iii)–F moieties.
ISSN:2050-7488
2050-7496
DOI:10.1039/c7ta06655d