Hydrogen bond donor functionalized poly(ionic liquids)@MIL-101 for the CO capture and improving the catalytic CO conversion with epoxide.

Hydrogen bond donor functionalized poly(ionic liquids) were incorporated into MIL-101 framework for synthesis of composites PIL-R@MIL-101 (R = COOH, OH, NH). The effect of different hydrogen bond donors on CO-epoxide cycloaddition reaction was discussed through XPS, NH-TPD characterizations. Thereinto, PIL-COOH@MIL-101 showed efficient catalytic performance in the cycloaddition reaction of CO and epichlorohydrin, 92.7% substrate conversion was obtained under 70 °C, 1.0 MPa, cocatalyst- and solvent-free conditions for 2.5 h. The improved activity was benefited from the synergistic effects of Lewis acidic Cr centers, carboxyl group, and nucleophilic Br, together with the high surface area (1178 m/g), and good CO affinity. In addition, PIL-COOH@MIL-101 also showed facile recovery method by easy centrifugation and good recycling stability. Considering the good CO affinity, excellent catalytic performance in CO cycloaddition reaction, better thermal and recycling stabilities, the facilely prepared functionalized poly(ionic liquid)@MIL-101 composite would exhibit promising application prospect in CO capture and conversion.