CO2 cycloaddition of styrene oxide over MOF catalysts

Authors: Jun Kim, Se-Na Kim, Hoi-Gu Jang, Gon Seo, Wha-Seung Ahn

Abstract:
Metal organic framework (MOF) structures of UIO-66, UIO-66-NH₂, Mg-MOF-74, MIL-101, CuBTC, ZIF-8, IRMOF-3, and MOF-5 having different acid/base properties were prepared and tested for their catalytic activity in the CO₂ cycloaddition to styrene epoxide using a high-pressure batch reactor. The high crystallinity and excellent textural properties of the prepared MOF materials were confirmed by XRD and the N₂ adsorption–desorption isotherms at 77K. Their catalytic cycloaddition activities were found to be well correlated with the Lewis acid/base distributions of the materials examined by NH3- and CO₂-TPD, respectively, such that the concurrent presence of Lewis acid and base sites were desirable for high catalytic activity. For a given catalyst weight, UIO-66-NH₂ showed the best catalytic performance among the MOF samples tested with close to 100% selectivity to carbonate in chlorobenzene under relatively mild reaction conditions (2.0 MPa, 373K). UIO-66-NH₂ could be reused 3 times without losing catalytic activity in a truly heterogeneous mode without structural deterioration, and it also exhibited excellent cycloaddition activities for different epoxide substrates as well.

Keywords:
Metal organic frameworks (MOFs)
CO₂ cycloaddition
Lewis acid/base
NH3- and CO₂-TPD
UIO-66-NH₂

Published in: Applied catalysis A: General  (Volume 453, Pages 1-402, 26 February 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

CO2 cycloaddition of styrene oxide over MOF catalysts

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