Six new hybrid materials composed of carbon nanohorns (CNHs) and highly cross-linked imidazolium salts were easily synthesized using a one-step procedure based on the radical oligomerization of bis-vinylimidazolium salts (bVImiX) in the presence of pristine CNHs. The hybrid materials were characterized and employed as the sole catalysts for the conversion of carbon dioxide into cyclic carbonate by reaction with epoxides. The solids displayed excellent turnover number and productivity. Moreover, four catalysts were investigated in recycling experiments. Two catalysts containing an octyl linker between the imidazolium units and a bromide or an iodide anion showed no loss in activity after three cycles. The other two catalysts containing a p-xylyl linker and a bromide anion and different CNHs/bVImiX ratios showed an unprecedented increase of activity after recycling.

Calabrese, C., Liotta, L., Carbonell, E., Giacalone, F., Gruttadauria, M., & Aprile, C. (2017). Imidazolium-Functionalized Carbon Nanohorns for the Conversion of Carbon Dioxide: Unprecedented Increase of Catalytic Activity after Recycling. CHEMSUSCHEM, 10(6), 1202-1209 [10.1002/cssc.201601427].

Imidazolium-Functionalized Carbon Nanohorns for the Conversion of Carbon Dioxide: Unprecedented Increase of Catalytic Activity after Recycling

Calabrese, Carla;LIOTTA, Leonarda Francesca;GIACALONE, Francesco;GRUTTADAURIA, Michelangelo;APRILE, Carmela
2017

Abstract

Six new hybrid materials composed of carbon nanohorns (CNHs) and highly cross-linked imidazolium salts were easily synthesized using a one-step procedure based on the radical oligomerization of bis-vinylimidazolium salts (bVImiX) in the presence of pristine CNHs. The hybrid materials were characterized and employed as the sole catalysts for the conversion of carbon dioxide into cyclic carbonate by reaction with epoxides. The solids displayed excellent turnover number and productivity. Moreover, four catalysts were investigated in recycling experiments. Two catalysts containing an octyl linker between the imidazolium units and a bromide or an iodide anion showed no loss in activity after three cycles. The other two catalysts containing a p-xylyl linker and a bromide anion and different CNHs/bVImiX ratios showed an unprecedented increase of activity after recycling.
Settore CHIM/06 - Chimica Organica
Settore CHIM/04 - Chimica Industriale
http://www.interscience.wiley.com/jpages/1864-5631
Calabrese, C., Liotta, L., Carbonell, E., Giacalone, F., Gruttadauria, M., & Aprile, C. (2017). Imidazolium-Functionalized Carbon Nanohorns for the Conversion of Carbon Dioxide: Unprecedented Increase of Catalytic Activity after Recycling. CHEMSUSCHEM, 10(6), 1202-1209 [10.1002/cssc.201601427].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10447/225007
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