Immobilized protic ionic liquids: Efficient catalysts for CO2 fixation with epoxides

• Cycloaddition of carbon dioxide and epoxides was catalyzed by supported protic ionic liquid without metal and solvent.
• Supported protic ionic liquid showed highly catalytic activity.
• Supported protic ionic liquid with excellent stability and recyclability.
• The synergistic effects of cation and anion in supported protic ionic liquid.

A series of immobilized protic ionic liquids were prepared and used as catalysts for chemical fixation of carbon dioxide with epoxide to form cyclic carbonate. The effects of reaction temperature, carbon dioxide pressure and the loading of immobilized ionic liquid on the synthesis of cyclic carbonate from carbon dioxide and epoxide were investigated. Under the optimized reaction conditions, PS-ImHI showed the highest catalytic activity, and propylene carbonate was yield to 98.1% with more than 99% of selectivity. In the coupling reaction of carbon dioxide and epoxide, the immobilized ionic liquids showed high stability and could be reused ten times and used in a continuous flow reaction with a fixed-bed reactor for more than 120 h without loss of catalytic activity.

A series of immobilized protic ionic liquids were prepared and used as catalysts for chemical fixation of carbon dioxide with epoxide to form cyclic carbonate. Under the optimized reaction conditions, PS-ImHI showed the highest catalytic activity, and propylene carbonate was yield to 98.1% with more than 99% of selectivity. And the immobilized ionic liquids could be reused ten times without loss of catalytic activity.Figure optionsDownload high-quality image (97 K)Download as PowerPoint slide