The rational integration of multi-functional components with metal-organic frameworks(MOFs)to form MOF-based catalysts can often afford enhanced catalytic activity for specific reactions.Herein,we propose a novel strategy for the synthesis of hierarchically porous MOFs(e.g.,MIL-101)-encapsulated N-doped nanocarbon(CN@MIL)by controlled pyrolysis of ionic liquids@MIL-101 precursors(ILs@MIL).The obtained CN@MIL composites not only possess abundant enlarged mesopores,but also show multi-active sites without the sacrifice of their structure stability.The CN@MIL can efficiently facilitate the mass transfer of substrates,exhibiting excellent catalytic performance in the synthesis of cyclic carbonates from epoxides and CO2 under mild and co-catalyst-free conditions(i.e.,90℃and ambient pressure of CO2).Furthermore,the multi-active Lewis acid sites and nucleophilic sites(Br ions)as well as the strong affinity of catalysts toward CO2 also contribute to the excellent catalytic activity of the CN@MIL.This study might open a new avenue for the rational design of MOF-based composites by employing ILs@MOF as precursors for advanced heterogeneous catalysis.

Fengfeng Chen;Kui Shen;Liyu Chen;Yingwei Li

Guangdong Provincial Key Laboratory of Fuel Cell Technology,School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510640,China;State Key Laboratory of Pulp and Paper Engineering,School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510640,China

中国科学:化学（英文版）

[1]Fengfeng Chen;Kui Shen;Liyu Chen;Yingwei Li-.N-doped nanocarbon embedded in hierarchically porous metal-organic frameworks for highly efficient CO2 fixation)[J].中国科学:化学（英文版）,2022(07):1411-1419

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