Highly Efficient Polymer-Supported Catalytic System for the Valorization of Carbon Dioxide.
Polydibenzo-18-crown-6 was utilized as a co-catalyst and polymeric support in combination with potassium iodide for the synthesis of cyclic carbonates from carbon dioxide and epoxides under mild and solvent-free conditions. The efficiency of this catalytic system can be easily increased by loading the polymer with KI prior to the reaction. The influence of various reaction parameters were studied thoroughly. The scope and limitation of the catalyst system was studied at 80 °C and 100 °C. A large number of terminal epoxides (14) were converted to the desired cyclic carbonates in yields up to 99%. We could successfully recover and reuse the catalyst >20 times with excellent yields up to 99%. Although, we observed that the activity gradually decreased after repetitive cycles. This decrease was attributed to KI leaching and partial degradation caused by mechanical stirring. This assumption is supported by scanning electron microscopy and energy dispersive X-ray spectroscopy.
Leibniz-Institut für Katalyse e. V. (LIKAT Rostock), Albert-Einstein-Str. 29a, 18059, Rostock, Germany.
Willi
W
Desens
Leibniz-Institut für Katalyse e. V. (LIKAT Rostock), Albert-Einstein-Str. 29a, 18059, Rostock, Germany.
Christina
C
Kohrt
Elektronenmikroskopisches Zentrum, Universitätsmedizin Rostock, Strempelstraße 14, 18057, Rostock, Germany.
Marcus
M
Frank
Leibniz-Institut für Katalyse e. V. (LIKAT Rostock), Albert-Einstein-Str. 29a, 18059, Rostock, Germany. Thomas.Werner@catalysis.de.
Thomas
T
Werner
D002245:Carbon Dioxide / Q000737:chemistry*; D002384:Catalysis; D043844:Crown Ethers / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D011188:Potassium / Q000737:chemistry
D043844:Crown Ethers; D011108:Polymers; D002245:Carbon Dioxide; D011188:Potassium
carbon dioxide; epoxide; heterogeneous catalysis; polymeric support; potassium iodide