Porous Ionic Liquids Featuring Chemical Site Toward Low‐Pressure CO ₂ Capture and Conversion

Abstract To achieve the “dual carbon” goal, capturing low‐pressure CO 2 from gas mixtures such as flue gas and biogas has garnered increasing significance within domains such as environmental sustainability. Porous liquids (PLs) emerge as promising CO 2 capture materials leveraging the synergistic integration of intrinsic nanoporosity, enabling selective gas accommodation and bulk‐phase fluidity that facilitates industrial‐scale processing. This work demonstrates the fabrication of a novel class of PLs through the surface functionalization of ZIF‐90 nanoparticles with O/N heteroatom‐functionalized ionic liquids, which can effectively and reversibly recognize low‐pressure CO 2 from CH 4 or N 2 . Experimental results show that the optimized ZIF‐90‐PLs exhibit exceptional absorption capacity and remarkable selectivity for the capture of low‐pressure CO 2 from CO 2 /CH 4 (15/85) and CO 2 /N 2 (15/85) mixtures. Furthermore, these engineered PLs enable the thermodynamically driven cycloaddition of CO 2 to epoxides with quantitative conversion yields into value‐added cyclic carbonates under solvent‐free conditions. These innovative PLs anchored with active sites achieve remarkable enhancement in selective capture efficiency toward a low‐pressure CO 2 environment, demonstrating compelling potential for scalable implementation in industrial carbon sequestration systems.