The catalytic activity of zeolitic imidazole framework-8
(ZIF-8)
and amine-functionalized ZIF-8 catalysts in the synthesis of chloropropene
carbonate from CO2 and epichlorohydrin is demonstrated.
In contrast to hitherto known catalysts, ZIF-8 catalysts displayed
high epoxide conversions and moderate to high selectivities to chloropropene
carbonate at reaction temperatures as low as 70 °C. No cocatalysts
or solvents were required during the reaction. The incorporation of
ethylenediamine in ZIF-8 enhanced its catalytic performance as a result
of the higher CO2 adsorption capacity of the amine-functionalized
samples. The ZIF-8 catalysts, however, lost their distinctive crystalline
structure and superior catalytic performance when attempts were made
to recycle them after use.
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